Everything people ask
about box volume.

Multiply the three sides: volume = length × width × height. The only rule is that all three measurements must be in the same unit before you multiply. The box volume calculator handles that for you — you can enter the length in feet and the height in inches and it converts before multiplying. Link to this answer

V = l × w × h — the same formula as a box, because a box is a rectangular prism. “Box” is the everyday word, “cuboid” is the geometry term for a solid with six rectangular faces, and “rectangular prism” describes the same shape by its cross-section. All three are calculated identically. The formula page steps through it with worked examples. Link to this answer

Multiply all three together. A 12 × 9 × 6 inch box is 12 × 9 × 6 = 648 cubic inches. Which side you call length, width or height makes no difference to the volume — multiplication does not care about the order. It only matters when a carrier applies a rule to the longest side, which the dimensional weight calculator sorts out for you. Link to this answer

Multiply length × width × height with every measurement in feet. If you measured in inches, multiply the three inch figures and divide by 1,728 (that's 12 × 12 × 12). A 24 × 18 × 12 inch box is 5,184 in³ ÷ 1,728 = 3 ft³. The calculator shows cubic feet alongside eight other units at once. Link to this answer

Multiply the three sides in meters. From centimeters, multiply the three cm figures and divide by 1,000,000. From inches, multiply and then divide by 61,023.7. A 30 × 20 × 15 cm box is 9,000 cm³ = 0.009 m³. For freight, cubic meters are usually called CBM — see the CBM calculator. Link to this answer

Multiply the three inch dimensions, then divide by 1,728. Keep this separate from dimensional weight, which divides cubic inches by a carrier divisor instead — 139 at FedEx and UPS Daily Rates, 166 at UPS Retail. Cubic feet tell you how much space a box takes; dimensional weight tells you what it costs. Link to this answer

The space diagonal is √(l² + w² + h²) — Pythagoras in three dimensions. It is the longest straight line that fits inside the box, corner to opposite corner, so it is the limit on a rigid item like a curtain pole or a fishing rod. The calculator reports it with every result, and the box diagonal formula explains the derivation. Link to this answer

It depends who is asking. For what fits in the box, measure inside. For what a carrier will charge, measure outside — carriers measure the package as presented, including the board. On thick-walled or double-wall boxes that difference is easily half an inch per side. The calculator takes a wall thickness and converts in either direction. Link to this answer

Subtract twice the wall thickness from each outside dimension to get the inside dimensions, because every axis has two walls. A 12 × 9 × 6 in box with 0.25 in board is 11.5 × 8.5 × 5.5 in inside. Enter the thickness on the calculator and it does both directions, or use the speaker box calculator if you also need to subtract what is inside. Link to this answer

Volume is l × w × h and is measured in cubic units — it tells you how much fits inside. Surface area is 2(lw + lh + wh) and is measured in square units — it tells you how much cardboard, paint or wrapping you need. They are not interchangeable and they do not scale together: doubling every side multiplies surface area by 4 but volume by 8. See surface area vs volume. Link to this answer

Type the fraction exactly as you read it. Every field on the site accepts 12 1/2 and 1/2, as well as decimals and thousands separators like 1,200. Anything that is not a number is rejected outright rather than half-read, so a typo can never quietly become a wrong answer. Link to this answer

Cube the side length: V = s³. A 12-inch cube is 12 × 12 × 12 = 1,728 in³, which is exactly 1 cubic foot — a useful number to remember, because USPS only applies dimensional weight above 1,728 in³. Enter the same figure in all three fields on the calculator. Link to this answer

Multiply length × width. That gives you the footprint in square units — useful for working out how much shelf or pallet deck a box occupies. Multiply the base area by the height and you are back to volume. The boxes per pallet calculator works from footprints like this. Link to this answer

Multiply the three centimeter measurements for cm³, then divide by 1,000 for liters — because one liter is exactly 1,000 cm³. A 30 × 20 × 15 cm box is 9,000 cm³ = 9 liters. The cm³ to liters converter does it both ways. Link to this answer

The same formula with millimeter measurements: V = l × w × h. Because there are 10 mm in a centimeter, there are 1,000 mm³ in a cm³ and a million mm³ in a liter — so millimeter figures get large fast. The calculator shows mm³ alongside larger units so you can sanity-check the magnitude at a glance. Link to this answer

Because you have multiplied three lengths together. One length × one length gives an area, in square units. That area × another length gives a volume, in cubic units. So measuring in centimeters gives cm³, and measuring in inches gives in³. Link to this answer

Yes. Each of the three fields has its own unit selector, so you can enter a room as 10 ft × 8 ft × 94 in without converting anything by hand. Everything is converted internally before multiplying, and the result is shown in all nine volume units at once. Link to this answer

Measure the three edges that meet at one corner — length, width and height — with a tape or rule, keeping it square to the edge rather than diagonal. Measure the inside if you want to know what fits, the outside if a carrier is going to price it. Record all three in the same unit, or use the calculator's per-field unit selectors and let it convert. Link to this answer

Exactly the same as a closed one: length × width × height. The missing lid changes nothing about the space inside — it only matters for the surface area, where you drop one lw face, so the material needed becomes lw + 2lh + 2wh instead of 2(lw + lh + wh). For a tray or an open crate, the usable height is where you can actually fill to, not the rim. Link to this answer

Dimensional weight (or DIM weight) prices a package by the space it occupies rather than what it weighs. Multiply length × width × height and divide by the carrier's divisor: 139 in³/lb at FedEx and UPS Daily Rates, 166 in³/lb at UPS Retail, or 5,000 cm³/kg internationally. You are billed the greater of actual and dimensional weight. Work it out on the DIM weight calculator. Link to this answer

Both take the greater of the actual weight and the dimensional weight, then round up to the next whole pound. Both also round each dimension up to the next whole inch before multiplying — so a 12.1-inch side counts as 13. If a surcharge like Additional Handling or Large Package applies, a minimum billable weight can override the result entirely: 40 lb and 90 lb respectively. See UPS vs FedEx DIM rules. Link to this answer

The divisor is the number of cubic inches a carrier treats as one pound. A lower divisor means a higher billed weight. 139 is the standard for FedEx and UPS Daily Rates; 166 applies to UPS Retail Rates, which is the counter price and is more generous. The same 2,160 in³ box is 16 lb at 139 and 14 lb at 166. Link to this answer

FedEx, UPS and USPS round each dimension up to the next whole inch (or whole centimeter in metric) before multiplying — not after. So 12.1 × 10.2 × 8.3 in is billed as 13 × 11 × 9. DHL publishes no per-dimension rounding rule, so the site uses its measurements as given. The rounding step is shown explicitly on the DIM calculator so you can see what changed. Link to this answer

Girth is the distance around the box at its thickest point: 2 × (width + height), using the two shorter sides. Length plus girth is the longest side plus that figure. Carriers use it as a size limit and a surcharge trigger — FedEx and UPS flag Additional Handling above 105 in and Large Package or Oversize above 130 in, with a maximum of 165 in. Girth in shipping explains it with diagrams. Link to this answer

Stay under the thresholds. Additional Handling starts when the longest side is over 48 in, the second-longest is over 30 in, length + girth is over 105 in, the box is over 10,368 in³, or it weighs over 50 lb. Oversize starts at 96 in long or 130 in length + girth. Often one inch off the longest side is enough — find the right box flags the boxes that sit just under each line. Link to this answer

A package is a Large Package when its length plus girth is over 130 in, its longest side is over 96 in, or it exceeds 17,280 in³. Once it applies, UPS charges a minimum billable weight of 90 lb regardless of what the package actually weighs, and Additional Handling no longer applies on top. Check a specific box on the DIM calculator. Link to this answer

Outside the US, volumetric weight is normally cubic centimeters ÷ 5,000 to give kilograms. It is the IATA-derived standard used by FedEx International, UPS International, DHL Express and most European carriers. Air freight forwarders often use 6,000 instead, which is more generous. The 5000 divisor explained. Link to this answer

Daily Rates — the account pricing most businesses ship on — use a divisor of 139. Retail Rates, paid at a UPS Store counter, use 166, which produces a lower dimensional weight for the same box. The surcharge thresholds are the same either way. Both are presets on the DIM calculator, so you can compare the same package side by side. Link to this answer

Bring evidence: your actual shipment profile, the proportion of parcels where dimensional weight already decides the bill, and what a better divisor would be worth annually. A divisor is one of the more negotiable terms in a carrier contract because it costs the carrier nothing on dense freight. The DIM calculator has a custom divisor field so you can model an offer, and the negotiation guide covers the approach. Link to this answer

It is what a carrier charges when a package exceeds the maximum it accepts at all — for FedEx and UPS, over 108 in long, over 165 in length + girth, or over 150 lb. The fee is around $1,875 per package and the carrier may refuse it outright. Anything at that size should move as freight instead. Link to this answer

Almost always dimensional weight. A light but bulky package — pillows, lampshades, foam — is billed on the space it occupies, not its mass. Check three things on the DIM calculator: the divisor your account uses, whether dimensions were rounded up to the next whole inch, and whether a surcharge forced a minimum billable weight of 40 or 90 lb. Link to this answer

Length × width × height in centimeters, divided by 5,000, giving kilograms — the same divisor as most international services. You are charged on the greater of that and the actual weight. Parcelforce is a preset on the DIM calculator. Link to this answer

Carrier labels normally print both: the actual weight from the scale and the dimensional or billable weight the rate was built from, often with the measured dimensions beside them. If the two differ, the higher one is what you paid for. How to read a FedEx label walks through the fields. Link to this answer

When a surcharge applies, the carrier bills at least a set weight no matter how light the package is. FedEx and UPS apply 40 lb for Additional Handling and 90 lb for Large Package or Oversize. A 20 lb package that trips Large Package is billed as 90 lb — which is why staying one inch under a threshold can matter more than the weight itself. Link to this answer

FedEx US: 139 in³/lb. UPS Daily Rates: 139. UPS Retail Rates: 166. USPS: 139, but only on parcels over 1,728 in³. DHL Express from the US: 139. Internationally, FedEx, UPS and DHL all use 5,000 cm³/kg. Every figure here is taken from the carrier's own published guide and dated on the rule changes page. Link to this answer

Multiply length × width × height in meters. From centimeters, multiply the three figures and divide by 1,000,000. A 120 × 80 × 100 cm carton is 0.96 CBM. Freight is quoted per CBM for sea LCL and by chargeable weight for air. The CBM calculator gives CBM alongside cubic feet and the chargeable-weight equivalents. Link to this answer

A 20-ft container is roughly 5.89 × 2.35 × 2.39 m — about 33.1 CBM nominal, and closer to 28 CBM in practice once you account for stacking and the shape of your cartons. The number of boxes depends entirely on their dimensions and how they pack, so use the container fit calculator, which tries each orientation and reports the real figure rather than a volume-only estimate. Link to this answer

A 40-ft container is about 12.03 × 2.35 × 2.39 m — roughly 67.6 CBM nominal, about 58 CBM practical. A 40-ft high cube adds about 8 CBM on top of that. The container fit calculator works out how many of your specific cartons fit, in which orientation, and how much of the container you actually fill. Link to this answer

Multiply by 35.3147. One cubic meter is 35.31 ft³, and one cubic foot is 0.0283 m³. So a 12 CBM shipment is about 424 ft³. The CBM calculator shows both at once, which matters when a forwarder quotes in one unit and your warehouse works in the other. Link to this answer

Gross weight is what the shipment actually weighs. Volumetric weight converts its volume into a weight equivalent. Sea LCL normally charges on whichever is greater using a 1:1 ratio — one CBM is treated as one tonne. Air freight is far less generous, typically 6,000 cm³ per kilogram, and express services tighter still at 5,000. Link to this answer

Work out the volume in cubic centimeters and divide by 6,000 for the standard air freight ratio, or 5,000 for express. You are charged on the greater of that and the gross weight. Both ratios are presets on the DIM weight calculator. Link to this answer

Divide by 61,023.7 — there are that many cubic inches in a cubic meter. A 1,728 in³ box (one cubic foot) is 0.0283 CBM. The box volume calculator shows in³ and m³ together so you never have to do the conversion by hand. Link to this answer

Work out each box's volume, multiply by its quantity, and add them up. Doing that by hand across a packing list invites mistakes, so batch mode takes a grid of boxes with per-row units and quantities and gives you running totals in m³, ft³ and liters, with CSV export for your forwarder. Link to this answer

Nominal volume is the container's internal dimensions multiplied out. Practical volume is what you can actually load once cartons stop tessellating perfectly, pallets waste height, and the door aperture limits what goes in — typically 10–17% less. Plan to nominal and you will be short of space; the container fit calculator reports the real fill percentage for your cartons. Link to this answer

There is no single standard, which is why the figure has to be calculated rather than looked up. As a feel for the range: a 45 × 30 × 30 cm carton is 0.0405 CBM, and an 18 × 12 × 12 in carton is about 0.0425 CBM. Every one of the 155 box size pages lists its volume in cubic meters among other units. Link to this answer

CBM is cubic metres — the volume of your shipment, and the unit most ocean LCL and warehousing is quoted in. A forwarder charges on whichever is greater, the weight or the volume converted to a weight equivalent: 1:1 for sea LCL (one CBM billed as one tonne), 6,000 cm³/kg for air freight, 5,000 for express. Work yours out on the CBM calculator. Link to this answer

Multiply the pallet footprint by the load height. A GMA pallet at 48 × 40 in loaded 60 in high is 48 × 40 × 60 = 115,200 in³, about 1.89 CBM. Whether to include the pallet's own height depends on who is asking: freight quotes normally want the total including the pallet, while the pallet calculator reports the boxes-only height so you can add the deck yourself. Link to this answer

It depends on the box footprint and how the boxes are allowed to sit. A GMA pallet is 48 × 40 in; an EPAL Euro pallet is 1,200 × 800 mm. As a worked example, 18 × 12 × 10 in cartons on a GMA pallet with a 60-inch stack give 8 per layer and 6 layers — 48 boxes. The boxes per pallet calculator works it out for your sizes and draws the layer. Link to this answer

“Ti” is boxes per layer and “hi” is the number of layers; multiply them for the case count. Ti is not simply deck area ÷ box area, because boxes cannot be cut — you have to fit whole boxes, and mixing orientations usually beats a single direction. The pallet calculator tries one- and two-block patterns in both orientations and shows the winning layout. Link to this answer

There is no universal number — it is set by your carrier, your warehouse racking and the trailer. Common limits are 48–60 in for LTL freight and taller for containerised loads. Remember most stated limits include the pallet itself, while the boxes-only height is what you calculate; the pallet calculator takes your limit and reports load height for the boxes so you can add the pallet yourself. Link to this answer

Often, yes. Allowing boxes to turn 90° within a layer, or to lie on their side or end, can add several boxes per layer where a single direction leaves a dead strip. The gain is real but modest — commonly one to a few boxes per layer. The pallet calculator has a rotation option and tells you exactly how many more you gain over a simple one-direction stack. Link to this answer

Overhang is boxes extending past the deck edge. Most shippers and carriers discourage it because unsupported corners lose a large share of their compression strength and are more likely to be damaged or refused. If your carrier permits a small allowance, enter it on the pallet calculator and the layout will use it — the coverage figures then report against the allowed footprint, not the bare deck. Link to this answer

GMA is the North American grocery standard at 48 × 40 in. EPAL is the European pooled pallet at 1,200 × 800 mm, 144 mm tall, about 25 kg, with a safe working load of 1,500 kg. ISO 6780 sets several principal plan dimensions including 1200 × 1000 mm and 1100 × 1100 mm. The Australian 1165 × 1165 mm pallet is a national standard, not an ISO size. All are presets on the pallet calculator. Link to this answer

Work out both and take the lower. Height gives you a maximum number of layers; the weight limit gives you a maximum number of boxes at your per-box weight. Dense products hit the weight limit first and light bulky ones hit the height limit. The pallet calculator takes both and tells you explicitly when a load is weight-limited rather than height-limited. Link to this answer

Do not do it a row at a time. Catalogue mode takes a pasted product list — comma, tab or semicolon separated, with or without a header — and returns volume, dimensional weight and billable weight per SKU at your chosen carrier, with totals and a count of how many lines it read and skipped. Link to this answer

Both batch mode and catalogue mode have a CSV export button that downloads every row with its dimensions, units, quantity and computed volumes. Fields containing commas are quoted properly, so a value like 1,200 will not shift your columns when the file opens in Excel. Link to this answer

A two-block pattern splits the deck into two areas and runs the boxes in a different direction in each, which fills strips a single direction would waste. On square pallets — the 42 × 42 in and 48 × 48 in US drum sizes — it often beats a uniform layer outright. The pallet calculator evaluates these patterns automatically and draws the winner, with the turned boxes shaded. Link to this answer

Cubic pricing charges by the volume of the parcel rather than its weight, in tiers of 0.1 ft³. It is a commercial price — available through shipping software, permit imprint or USPS Returns, not at the retail counter. The parcel must be 0.50 ft³ or less, 20 lb or less, with no side over 22 inches. Work out your tier on the USPS cubic calculator. Link to this answer

Round each dimension down to the nearest quarter inch, multiply the three, divide by 1,728 for cubic feet, then round up to the next 0.1 ft³ — with 0.10 as the floor. USPS's own example: a 6⅛ × 5⅞ × 6⅜ in parcel measures as 6 × 5¾ × 6¼ = 215.63 in³ = 0.1248 ft³, which is tier 0.20. The cubic calculator does every step and shows its working. Link to this answer

Yes — for cubic pricing, each dimension is rounded down to the nearest quarter inch. That is the opposite of dimensional weight, where FedEx, UPS and USPS all round up to the next whole inch. It is the single most common mistake people make with cubic pricing, and it works in your favor: 6.9 inches measures as 6.75. Link to this answer

The same tier structure as Priority Mail Cubic, applied to Ground Advantage, with a more generous volume cap of 1.00 ft³ against Priority's 0.50 ft³. The 20 lb weight limit and the 22 inch longest-side limit are the same. The calculator checks both programs at once. Link to this answer

Soft packs and padded envelopes are priced by length plus width rather than volume, each rounded down to the quarter inch. Up to 21 in is tier 0.10; over that up to 27 in is 0.20; up to 31 in is 0.30; up to 34 in is 0.40; and up to 36 in is 0.50. Beyond 36 in, cubic pricing does not apply. Link to this answer

No side of a cubic-priced parcel may exceed 22 inches, whatever its volume. A long, thin box can be well under the volume cap and still be ineligible. The calculator checks this separately from the volume and tells you which limit you failed. Link to this answer

It depends which side you trim, because the tiers are volume-based — taking an inch off the longest side removes the most volume. The cubic calculator works it out for you: it names the side, gives the target measurement, and states the tier you would land in. Given the quarter-inch round-down, the saving is often smaller than you would guess. Link to this answer

Only above one cubic foot — 1,728 in³. At or below that, USPS prices on actual weight alone. This produces a genuinely counter-intuitive result: a slightly larger box that stays under 1,728 in³ can cost less at USPS than a snug one just over it. Above the threshold, the divisor is 139 and billable weight is capped at 70 lb. Link to this answer

Flat Rate boxes are priced per box, with no weight or dimensional-weight pricing at all, up to 70 lb. The four standard sizes and their inside dimensions are listed on the box sizes hub, and find the right box tells you when your item also fits one — which is frequently the cheapest option for something dense. Link to this answer

70 lb, and a maximum of 108 inches in length plus girth. Cubic pricing has a much tighter limit of 20 lb. Anything heavier has to move on a different service or as freight. Link to this answer

Amazon sorts the packaged product's three sides into longest, median and shortest, works out length + girth, and takes the shipping weight as the greater of unit weight and dimensional weight (L × W × H ÷ 139). Those four numbers decide the tier. The FBA size tier calculator applies every 2026 US threshold and shows which one you breached. Link to this answer

Shipping weight is the greater of unit weight and dimensional weight. Fee weight is what Amazon actually charges on, and for some tiers it is not the same number — Small standard and the 150 lb+ extra-large band charge on unit weight alone, ignoring dimensional weight. Confusing the two produces the wrong fee; the calculator reports both separately. Link to this answer

For Small Bulky, Large Bulky and the extra-large tiers, Amazon treats any width or height below 2 inches as 2 inches when computing dimensional weight. A flat item therefore has a floor on its dimensional weight regardless of how thin it really is. The calculator applies this automatically. Link to this answer

You have to satisfy every constraint of the lower tier at once — longest, median and shortest side, length + girth, and weight. Shaving the longest side alone usually is not enough. The calculator's “shrink to the next tier down” block gives you a size and weight that actually lands in the tier, and you can retype those figures to confirm it. Link to this answer

Small standard is up to 16 oz, 15 × 12 × 0.75 in. Large standard is up to 20 lb, 18 × 14 × 8 in. The full table, including the bulky and extra-large bands, is on the FBA calculator. Link to this answer

Over-maximum applies above 96 in on the longest side or 130 in length + girth, and it is expensive. Weight alone does not trigger it — a 150 lb product within the size limits stays in the extra-large bands. Redesigning packaging to come under the length limit is usually worth more than shaving weight; check both on the calculator. Link to this answer

Length × width × height ÷ 139, with the width and height each floored at 2 inches for the bulky and extra-large tiers. The result is compared against the unit weight and the greater becomes the shipping weight. The FBA dimensional weight guide covers the details. Link to this answer

Enter the inside dimensions, a per-score allowance and a glue flap width on the box template generator. It draws the flat blank with cut lines in red and score lines in blue dashed, and downloads as a true 1:1 SVG, a single-sheet PDF at exact size, or a PDF tiled across Letter or A4 pages with a 10 mm overlap and registration marks. Link to this answer

The most common shipping box there is. Four side panels formed from one blank, with top and bottom flaps each half the panel width, so the outer flaps meet in the middle when folded. It is economical because it wastes almost no board. The template generator produces it as its default style. Link to this answer

0200 is an RSC with no top flaps — an open-top tray, used as a cover or for products loaded from above. 0203 is a full-overlap: the flaps run the entire panel width and overlap completely, giving a double layer of board on the top and bottom. 0203 is much stronger for heavy or fragile contents but uses more board. All three are selectable on the template generator. Link to this answer

The score allowance is the extra added at each fold so the board can wrap around itself — roughly the board caliper, commonly about 1/8 in (3 mm) for single-wall. Each panel gains one allowance and the depth gains two. Glue flaps are typically 1 to 1.5 in. The generator takes both as inputs and shows a parts table of how each panel size was derived — but a production run should use your box maker's own allowances for the board grade and flute. Link to this answer

Use the tiled PDF option on the template generator. It splits the blank across as many sheets as needed with a 10 mm overlap and a trim rectangle on each page, then you tape them together. Print at 100% with no “fit to page” scaling, or the template will not be 1:1. Link to this answer

Measure the flat board with calipers, or press a scrap between two rigid surfaces and measure the gap. Typical single-wall flutes run about 1.5 mm (E), 3 mm (B), 4 mm (C) and 5 mm (BC double wall). The figure matters twice: it is your score allowance on the template generator, and it is the difference between inside and outside dimensions when a carrier measures your finished box. Link to this answer

Enter the item and any padding on find the right box. It checks all 155 standard sizes in every orientation, ranks the ones that fit by what they would actually bill at your carrier, and reports the wasted space in each. The cheapest box is not always the smallest — a box that stays under a surcharge threshold can beat a tighter one that crosses it. Link to this answer

Multiply by 7.480519. One cubic foot holds 7.48 US liquid gallons. Going the other way, divide by the same figure. The ft³ to gallons converter does both, and handles UK imperial gallons alongside. Link to this answer

Exactly 1,000. A cubic meter is a cube one meter on each side, and a liter is a cube 10 cm on each side — ten of those fit along each edge, so 10 × 10 × 10 = 1,000. This is one of the few conversions that is exact rather than approximate. Link to this answer

Divide by 1,728 — that is 12 × 12 × 12. A 2,160 in³ box is 1.25 ft³. The mistake to avoid is dividing by 12: that converts a length, not a volume. Link to this answer

Exactly 1,000. So dividing cubic centimeters by 1,000 gives liters, and a 30 × 20 × 15 cm box holds 9 liters. The cm³ to liters converter works in both directions. Link to this answer

Yes — exactly, by definition, since 1964. One milliliter is one cubic centimeter. Medicine and cooking tend to use milliliters, engineering and engine displacement use cm³ (or “cc”), but the quantity is identical. The full explanation covers why the historical definition briefly made them differ. Link to this answer

Multiply by 28.3168. One cubic foot is 28.32 liters. It is a useful conversion when a US appliance is specified in cubic feet and you are thinking in liters — a 12.8 ft³ chest freezer is about 363 liters. The calculator shows both units together. Link to this answer

Multiply by 27 — three feet per yard, cubed. It is the conversion behind every bulk landscaping and concrete quote, because material is sold by the cubic yard and bags are sized in cubic feet. A cubic yard is 27 ft³, which is 13½ 2 ft³ mulch bags or 45 80-lb concrete bags. Link to this answer

The UK imperial gallon is about 20% larger — 4.546 liters against the US gallon's 3.785. Put the other way round, a US gallon is about 17% smaller than a UK one. Aquarium and pool figures quoted online are usually US gallons, so check before you dose anything. The converter shows both. Link to this answer

1,728 — that is 12 × 12 × 12. It is worth memorising because it is the conversion behind almost every shipping calculation, and because it is the exact point at which USPS starts applying dimensional weight. Link to this answer

Multiply by 0.0283168, or divide by 35.3147. A 40-ft container at about 2,387 ft³ is roughly 67.6 CBM. The CBM calculator shows both units together. Link to this answer

Work out the volume in cubic inches, then divide by 231 for US liquid gallons or by 277.42 for UK imperial gallons. A 24 × 18 × 12 in box holds 5,184 in³ = 22.4 US gallons. From cubic feet, multiply by 7.4805 instead. The calculator shows both gallon types alongside the metric units. Link to this answer

Divide each length by 10 before multiplying — or multiply the three millimetre figures and divide the result by 1,000, since there are 1,000 mm³ in a cm³. The mistake to avoid is dividing the volume by 10: you have three dimensions, so the factor is cubed. You do not have to convert at all on the calculator — just pick mm on each field. Link to this answer

Multiply the three inch measurements for cubic inches, then multiply by 0.0163871 to get litres. A 12 × 9 × 6 in box is 648 in³ = 10.6 litres. Going the other way, one litre is 61.02 in³. Link to this answer

28.32 litres. A cubic foot is also 7.48 US gallons, 6.23 UK gallons and 1,728 cubic inches — a useful set of equivalents when an appliance is rated in cubic feet and you are thinking in litres. Link to this answer

Multiply length × width × thickness with everything in the same unit, then convert to cubic yards by dividing cubic feet by 27. A 10 × 10 ft slab 4 in thick is 33.3 ft³ = 1.23 yd³. Always order more than the bare calculation: the concrete calculator adds a 10% overage for spillage and uneven subgrade, which is what the ground under a slab will cost you. Link to this answer

An 80 lb bag yields about 0.6 ft³, a 60 lb bag about 0.45 ft³ and a 40 lb bag about 0.3 ft³ — so a cubic yard takes roughly 45, 60 or 90 bags. The concrete calculator gives the count for your slab with the overage already included, rounded up to whole bags. Over about half a cubic yard, ready-mix is usually cheaper than mixing that many bags by hand. Link to this answer

Multiply the bed's length × width × depth. Fill depth is what matters, not the height of the frame — most people fill a few inches below the top. A 4 × 8 ft bed filled 10 in deep needs 26.7 ft³, just under a cubic yard. The garden soil calculator gives cubic yards and bag counts. The raised bed guide covers mixes and settling. Link to this answer

Thirteen and a half, since a cubic yard is 27 ft³ — so order 14. In 1.5 ft³ bags it is 18, and in 40 liter bags it is 20. Over roughly a cubic yard, bulk delivery is normally 30–50% cheaper than bags, though many suppliers have a two-yard minimum. The soil calculator gives the counts for your bed. Link to this answer

Multiply the area by the depth. A cubic yard covers 324 ft² at 1 in deep, 162 ft² at 2 in, 108 ft² at 3 in and 81 ft² at 4 in — mulch is normally laid 2–3 in deep and gravel 2–4 in. The mulch and gravel calculator gives cubic yards and bag counts for 2 ft³, 1.5 ft³ and 0.5 ft³ bags. Link to this answer

Length × width × average depth in feet, then multiply cubic feet by 7.48 for US gallons. Use the average depth if the floor slopes — add the shallow and deep ends and halve. A 30 × 15 ft pool averaging 5 ft holds 16,831 gallons. The pool calculator does it, and the pool volume guide covers irregular shapes. Link to this answer

Dosing is per unit of water, so the volume has to be right first — an error there scales straight into the chemical. As a rough guide, about 2 oz of calcium hypochlorite per 10,000 gallons raises free chlorine by roughly 1 ppm. The pool calculator gives the dose for your volume. Always follow your product's own label — concentrations vary — and test rather than assume. Link to this answer

Multiply the three inside dimensions and divide by 231 for US gallons, or multiply cm³ by 0.001 for liters. Note that the geometric figure is the volume full to the brim: glass thickness, substrate, rock and the gap you leave at the top typically take 10–15% out, and the trade name (a “55-gallon” tank) is a nominal label rather than a measurement. The aquarium calculator shows both figures. Link to this answer

Measure the usable interior — width × depth × height — and divide cubic inches by 1,728. A 28 × 22 × 36 in chest freezer is 12.8 ft³. Manufacturer ratings are usually gross interior volume and do not deduct shelves, baskets or the compressor hump, so your practical capacity is a little lower. The freezer calculator converts and estimates what it holds. Link to this answer

About 35–40 lb of packaged food per cubic foot is the usual planning rule, so a 7 ft³ chest freezer holds roughly 245–280 lb. Bulky or awkward items — a whole turkey, a side of beef — pack far less efficiently, so treat the lower end as realistic. The freezer calculator gives the range for your appliance. Link to this answer

Add up the volume of every box and piece of furniture. As a rough check, a one-bedroom flat is commonly 300–400 ft³ and a three-bedroom house 1,000–1,500 ft³. The moving calculator works it out and maps it to truck sizes, and the moving guide covers estimating furniture you cannot easily measure. Link to this answer

Compare the appliance's smallest face — usually depth × width — against the doorway opening. If it is slightly too wide, tilting may still work, and then the number that matters is the diagonal of that face rather than its width. A 36 × 30 in face has a 46.9 in diagonal, comfortably inside a standard 32 in door's own diagonal. The appliance fit calculator does the tilt maths. Remember to allow for the handles and the door itself, and that you also have to turn the corner beyond. Link to this answer

Compare your load's volume and its longest dimension against the van's cargo area — and check both, because a load can fit by volume and still not go in. A long-wheelbase Sprinter is roughly 144 × 70 × 76 in behind the seats. The cargo van calculator has real van dimensions built in and reports the space diagonal, which is what limits anything rigid. Link to this answer

Work out the volume of what you are storing, then allow for the fact that you cannot stack to the ceiling or fill the aisle you need to reach the back — practical capacity is well below the nominal figure. Storage unit sizing covers what actually fits in each common size, and the moving calculator gives you the volume to start from. Link to this answer

Multiply length × width × the filled depth, not the tank height — water rarely goes to the brim. For US gallons divide cubic inches by 231, or multiply cubic feet by 7.48; for litres, divide cubic centimetres by 1,000. A 48 × 24 × 20 in tank filled to 18 in holds 20,736 in³ = 89.8 gallons. One US gallon of fresh water weighs about 8.34 lb, which matters more than the volume once you are working out whether the floor will take it. Link to this answer

Multiply length × width × the sand depth in feet. A 6 × 6 ft sandbox filled 8 in deep needs 6 × 6 × 0.667 = 24 ft³, which is just under a cubic yard, or about 12 of the 2 ft³ bags play sand is normally sold in. Fill depth is usually 6–10 in for a play box. The mulch and gravel calculator handles this — same maths, different material. Link to this answer

Volume alone cannot tell you a weight — you need the density of what is going in. Multiply the volume by the material's density: water is 1 kg per litre, dry sand is roughly 1.6, gravel about 1.5, and loose packed goods far less. A 40-litre box of water is 40 kg; the same box of packing peanuts is under a kilogram. Separately, the box itself has a load limit — the board grade's stacking strength — which is printed in the Box Certificate stamp on the flap. Link to this answer

The smallest standard box your item fits in with the padding it needs — but check the billed weight before you commit, because the cheapest box is not always the smallest. A box that stays under a surcharge threshold can beat a tighter one that crosses it. Find the right box checks every standard size in every orientation and ranks them by what your carrier would actually charge. Link to this answer

Multiply the inside length × width × height and divide cubic inches by 1,728 for cubic feet, which is the unit movers quote in. An 18 × 18 × 16 in box is 5,184 in³ = 3 ft³. For a whole move, add every box and piece of furniture — the moving calculator does the totting up and maps the result to truck sizes. Link to this answer

There is no legal standard, but the common retail sizes are roughly: small 16 × 12 × 12 in (1.33 ft³), medium 18 × 18 × 16 in (3 ft³), large 18 × 18 × 24 in (4.5 ft³) and extra-large 24 × 18 × 24 in (6 ft³). Brands vary, so measure the ones you actually have. U-Haul's five published sizes and their cubic feet are on the moving box sizes page. Link to this answer

“Standard” covers a wide range — anything from a 6 × 6 × 6 in cube at 0.125 ft³ to a 24 × 24 × 24 in at 8 ft³. Rather than guess, the box sizes library lists 155 standard sizes with the volume of each in every unit, what it bills at each carrier, and how many fit on a pallet. Link to this answer

1.5 ft³ is 2,592 cubic inches, which several different shapes satisfy — 18 × 12 × 12 in is 1.5 ft³, and so is 24 × 12 × 9 in. Cubic feet alone never tell you whether something fits; you need all three dimensions for that. Enter the item on find the right box and it will name actual sizes that take it. Link to this answer

Work from the inside dimensions your product needs, including any void fill or insert, then add the board thickness to get the outside size the carrier will measure. Both figures matter: the inside decides whether the product fits, the outside decides what you pay. The box template generator takes inside dimensions and a score allowance and gives you the flat blank to send to a box maker. Link to this answer

Measure the outside of the sealed, made-up package — including any bulge, tape or label sleeve, because that is what the carrier's automated dimensioner sees. Note the longest side first, then the other two, and work out length + girth if the parcel is large. Postal services also apply their own limits: USPS caps parcels at 108 in length + girth and 70 lb. Link to this answer

Multiply the three outside dimensions. What the post office does with that figure depends on the service: USPS applies dimensional weight only above 1,728 in³, cubic pricing works from volume rounded down to the quarter inch, and Flat Rate ignores volume entirely as long as the item fits in the box. The USPS cubic calculator and the DIM calculator cover the two priced routes. Link to this answer

Add the area of all six faces: 2(lw + lh + wh). A 12 × 9 × 6 in box has a surface area of 2(108 + 72 + 54) = 468 in². That is the figure you want for board, wrapping or paint — not the volume. The calculator reports it alongside every result. Link to this answer

V = π r² h — the area of the circular end times the height. A drum 22 in across and 33 in tall holds π × 11² × 33 = 12,540 in³, about 54 US gallons. Note that this site's calculators handle rectangular boxes only, so do not enter a cylinder's bounding dimensions and expect a correct answer — that would overstate the volume by about 21%. Link to this answer

Take the average of the two parallel faces and multiply by the depth between them: V = ½(a + b) × h × d, where a and b are the two parallel widths. A hopper or a tapered bin works this way. This site's calculators are rectangular only, so work a tapered container out by hand or split it into a box plus a wedge. Link to this answer

Work out the area of the triangular end and multiply by the length: V = ½ × base × height × length. Triangular mailing tubes for posters and blueprints are prisms like this, and carriers still measure them by their bounding box, so the dimensional weight can be considerably more than the volume suggests. The calculator handles rectangular boxes only. Link to this answer

You cannot — three dimensions are needed for a volume. But if you know the volume and two of the sides, rearrange: height = volume ÷ (length × width). A box that must hold 2 ft³ on a 24 × 18 in footprint needs 3,456 ÷ (24 × 18) = 8 in of height. The same rearrangement gives you the fill depth for a known quantity of soil or concrete over a known area. Link to this answer

Split it into rectangular sections, work out each, and add them — an L-shape is two rectangles. For something with a sloped face, calculate the full box and subtract the wedge. For a genuinely irregular solid, water displacement is more reliable than arithmetic. This calculator handles rectangular boxes only and will give a wrong answer if you feed it the bounding dimensions of something that is not one. Link to this answer

Volume is the amount of three-dimensional space a solid occupies, or the amount a hollow container holds. For any prism — a shape with the same cross-section all the way along — it is the area of that cross-section multiplied by the length. For a box, that is length × width × height. Link to this answer

Any unit of length, cubed. Metric uses cubic millimetres, cubic centimetres and cubic metres, with the litre as a convenient alias for 1,000 cm³. Imperial uses cubic inches, cubic feet and cubic yards, with gallons for liquids. The SI base unit is the cubic metre; everything else is a convenience. Link to this answer

Volume is the space a thing occupies; capacity is how much a container can hold. For a thin-walled box they are nearly the same, but they diverge as the walls get thicker: a crate's outside volume counts the timber, its capacity does not. Volume is usually given in cubic units and capacity in litres or gallons, though they measure the same quantity. Link to this answer

Area covers a surface and needs two dimensions, measured in square units. Volume fills a space and needs three, measured in cubic units. The practical consequence is that they do not scale together: double every side of a box and its area goes up four times while its volume goes up eight. Link to this answer

Exactly as with whole numbers — multiply all three. Decimals matter most at the rounding step, not the multiplication: carriers round each dimension up to the next whole inch before multiplying, so 12.1 in is billed as 13, while USPS cubic pricing rounds down to the quarter inch. Keep the decimals in your own working and let the rule do the rounding. Link to this answer

A cube. For any given amount of material, the box that holds the most is the one where all three sides are equal — which is why a cube is the most efficient rectangular shape for board, and why long thin boxes waste it. Carriers reward the same shape: a cube has the lowest length + girth for its volume, so it is the least likely to trip an oversize threshold. Link to this answer

Divide the new volume by the old, subtract one, and multiply by 100. Because volume is a product of three numbers, small changes compound: adding 10% to every side raises the volume by 33%, not 30% (1.1³ = 1.331). This is why a box that looks only slightly bigger can cost noticeably more to ship. Link to this answer

Doubling one side doubles the volume. Doubling all three multiplies it by eight, because 2 × 2 × 2 = 8 — the single most common intuition failure with volume. Halving one side likewise halves the volume, which is why trimming the longest dimension is the most effective way to cut dimensional weight. Link to this answer

Put length, width and height in three columns and use =A2*B2*C2, keeping every column in the same unit. For cubic feet from inches, divide by 1728; for dimensional weight, use =CEILING(A2*B2*C2/139,1). For more than a handful of rows, batch mode is quicker and exports to CSV, and it applies each carrier's rounding rules — which a naive spreadsheet formula will not. Link to this answer

A tape measure or a steel rule is enough for most boxes; calipers help for board thickness and small parts. A carpenter's square keeps the tape perpendicular to the edge, which is where most errors creep in. Carriers use automated dimensioners that measure the smallest box your package would fit in, so measure the bulges too, not the flat faces. Link to this answer

No — volume needs all three. What two dimensions give you is an area, which is a different quantity. If you know the volume you want and two sides, you can solve for the third: height = volume ÷ (length × width). And if you only know two sides of an existing box, measure the third; there is no way to infer it. Link to this answer

Start from the inside dimensions — outside minus twice the wall thickness on each axis — then subtract anything already in there: inserts, void fill, dunnage. Real usable space is lower still, because rigid items rarely tessellate. For fitting a specific item, the space diagonal matters as much as the volume: it is the longest straight line that will go in. The calculator reports both. Link to this answer

Usually one of five things. The carrier rounded each dimension up before multiplying, and you did not. They measured the outside of the made-up package including bulge and tape, while you measured the flat carton. They billed volumetric weight rather than volume, at a divisor you were not expecting. A surcharge forced a minimum billable weight of 40 or 90 lb. Or the shipment was rated per piece and one oversized carton set the rate for all of them. Put the package into the DIM calculator — it shows the rounding step and the surcharge separately, so you can see which one moved the number. Link to this answer

Multiply two sides first, then multiply that by the third — the order does not matter, so start with whichever pair is easiest. For cubic feet from inches, divide by 1,728, or measure in feet from the start and avoid the conversion. Rounding to convenient numbers as you go is fine for an estimate but not for a shipping quote, where a rounding error one way costs money. Link to this answer

Measure in feet rather than inches, and multiply. If you have inches already, multiply the three and divide by 1,728. For anything more than a couple of boxes, batch mode takes a list and totals it, which is both faster and less error-prone than a phone calculator. Link to this answer

Measure the smallest rectangular box the item would fit inside — its bounding box — because that is what a carrier charges on, protrusions and all. A pallet of oddly shaped goods is measured to the widest point of the load, not the deck. The gap between that bounding figure and the item's true volume is exactly why irregular freight is expensive, and why crating it tightly pays for itself. Link to this answer

Start from the outside dimensions, subtract twice the panel thickness on each axis for the gross internal volume, then subtract everything that occupies space inside: the driver's displacement, the port, and any bracing. The net figure is what the driver actually sees and what a box design specifies. The speaker box calculator does all of it and shows each subtraction as its own line. Link to this answer

Driver displacement is a manufacturer's figure — look for “displacement” or “net volume occupied” on the spec sheet; do not estimate it from the basket size. Port volume is its cross-sectional area × its length, which is why a long port in a small box is self-defeating. Bracing you can calculate from your own timber. Enter all three on the calculator and it subtracts them in order. Link to this answer

The Helmholtz relationship gives Fb = (c / 2π) × √(A / (V × Leff)), where A is the port area, V the net internal volume and Leff the port length plus an end correction of about 0.732 × the port diameter. Rearranged, it gives the length needed for a target. The calculator does both directions — but treat the result as a starting point and confirm by measuring the impedance minimum in the finished box. Link to this answer

Yes, free and without any obligation to credit us — though a link is appreciated. The embed builder generates an iframe snippet, lets you set the size, the starting dimensions and the unit, and shows a live preview of exactly what your visitors will see. Link to this answer

Enter the three dimensions, pick the unit for each — they can differ — and read the result. On this site you also get the volume in nine units at once, the surface area, the space diagonal, a 3D preview you can rotate, and a link that restores the exact state so you can send it to someone. Fractions like 12 1/2 are accepted as typed. Link to this answer

The arithmetic is exact; what varies is whether the rules around it are right. The volume of a rectangular box is a simple product and any calculator will get it. The difference shows in the carrier logic — whether the divisor is current, whether each dimension is rounded up before multiplying rather than after, whether a surcharge minimum is applied. Every carrier figure on this site is generated from one rules file that cites the carrier's own published document and the date it was checked; see rule changes and our methodology. Your own measurement is the other half of the accuracy, and usually the weaker one. Link to this answer

Yes. Batch mode gives you a grid of boxes with per-row units and quantities, and running totals in cubic metres, cubic feet and litres. For a product list rather than a packing list, catalogue mode takes a pasted file and returns dimensional and billable weight per SKU. Link to this answer

Each size separately, multiplied by its quantity, then summed — mixing sizes is exactly where manual arithmetic goes wrong. Batch mode handles different units per row, so a list with some boxes in inches and others in centimetres totals correctly without converting anything first. Link to this answer

Both batch mode and catalogue mode export CSV with every row's dimensions, units, quantity and computed volumes, ready to paste into a manifest or a forwarder's template. Values containing commas are quoted correctly, so a figure like 1,200 will not shift your columns. Link to this answer