28 × 28 × 28 box
volume & shipping weight
A 28 × 28 × 28 inch box holds 21,952 cubic inches — 12.7 cubic feet, or 359.7 liters. In metric it measures 71.1 × 71.1 × 71.1 cm. It’s a cube, so every side is the same.
What a 28x28x28 box bills at
Carriers charge the greater of actual weight and dimensional weight. For this box: 21,952 in³ ÷ 139 = 157.93 → 158 lb at FedEx, UPS Daily Rates and DHL; ÷ 166 = 132.24 → 133 lb at UPS Retail. If what’s inside weighs more than that, you pay the actual weight.
| Carrier / rates | Divisor | DIM weight | Billed at least | Note |
|---|---|---|---|---|
| FedEx (US) | 139 in³/lb | 158 lb | 158 lb | Fractions of an inch round up; weight rounds up to the next lb. |
| UPS Daily Rates | 139 in³/lb | 158 lb | 158 lb | Account rates. Dimensions round up to whole inches. |
| UPS Retail Rates | 166 in³/lb | 133 lb | 133 lb | UPS Store / counter, domestic. |
| USPS Priority Mail & Ground Advantage | 139 in³/lb | 70 lb (70 lb cap) | 70 lb (70 lb cap) | Over 1 ft³, so DIM applies. Each side rounded up to the inch first. |
| DHL Express (from the US) | 139 in³/lb | 158 lb | 158 lb | Rated in whole-lb steps. |
| International, rated in kg | 5,000 cm³/kg | 75 kg | 75 kg | For rates quoted in kg (e.g. shipping from Europe or Asia): 72 × 72 × 72 cm after rounding each side up to the cm. From the US, FedEx and UPS use 139. |
“Billed at least” includes any minimum billable weight the box’s size triggers. Actual weight still wins if it’s higher.
Rules verified 22 Sep 2026 · sources: FedEx Service Guide 2026 · UPS 2026 Rate and Service Guide (Daily Rates) · UPS 2026 Rate and Service Guide (Retail Rates) · USPS DMM 223 (Priority Mail: DIM weight, cubic, nonstandard fees) · DHL Express US Service & Rate Guide 2026
Size checks for 28 × 28 × 28 in
Longest side 28 in, girth 2 × (28 + 28) = 112 in, so length + girth is 140 in. Here’s how that sits against each carrier’s lines (size only — weight rules are separate).
- UPS & FedEx Additional Handling (size)Applies — length + girth 140 in is over 105 in; 21,952 in³ is over 10,368 in³. 40 lb minimum billable weight. Longest side 28 in: 20 in under the 48 in line. Second-longest 28 in: 2 in under the 30 in line. Length + girth 140 in: 35 in over the 105 in line. Volume: 11,584 in³ over the 10,368 in³ line.
- UPS Large Package / FedEx OversizeApplies — length + girth 140 in is over 130 in; 21,952 in³ is over 17,280 in³. 90 lb minimum billable weight (US). Length + girth 140 in: 10 in over the 130 in line. Volume: 4,672 in³ over the 17,280 in³ line. Longest side: 68 in under the 96 in line.
- UPS & FedEx maximum sizeWithin the 108 in length and 165 in length + girth maximums.
- USPS size limitLength + girth 140 in is over USPS’s 130 in maximum.
- USPS nonstandard feesApplies for length over 22 in (up to 30 in) and over 2 ft³ (3,456 in³). A length fee and the 2 ft³ fee can both apply to one parcel.
- USPS Cubic pricing (commercial)Not eligible: 12.704 ft³ is over the 1 ft³ Ground Advantage Cubic maximum; longest side 28 in is over 22 in. Cubic calculator →
- DHL Express Oversize PieceClear: longest side 28 in (line: 40 in), second-longest 28 in (line: 32 in).
Rules verified 22 Sep 2026 · sources: FedEx Service Guide 2026 · UPS 2026 Rate and Service Guide (Daily Rates) · USPS DMM 101 (maximum size and weight) · USPS DMM 223 (Priority Mail: DIM weight, cubic, nonstandard fees) · USPS DMM 283 (Ground Advantage — Commercial, cubic) · DHL Express US Service & Rate Guide 2026
Trim one inch
On a cube every side counts the same: one inch off any side takes it to 21,168 in³ and 153 lb at 139 (saves 5 lb).
| Change | in³ | DIM ÷139 | Saves | UPS Retail ÷166 | USPS |
|---|---|---|---|---|---|
| Length 28 → 27 in | 21,168 | 153 lb | −5 lb | 128 lb | 70 lb |
On a 48 × 40 pallet
1 per layer (1 × 1, 28 in side up), 2 layers in 60 in of stack height = 2 boxes, 25.4 ft³ in all. The layer covers 41% of the deck.
Assumes a simple column stack, box upright, no overhang, 60 in of boxes on the deck. Interlocked or mixed patterns can fit more; check your carrier’s or warehouse’s height limit. Try mixed patterns, other pallets and heights →
Size tier
Extra-Large 150+ lb at the lightest. Amazon sets the tier on the greater of unit weight and dimensional weight — here 21,952 ÷ 139 = 157.93 lb. It’s Extra-Large because its length + girth 140 in is over 130 in and its 157.93 lb DIM weight is over 50 lb.
Rules verified 22 Sep 2026 · sources: Amazon Seller Central — Product size tiers
Heavier contents can move it up a tier — check with your product’s weight. See the FBA dimensional weight guide for 2026 fees.
Too big for every USPS Flat Rate box — the roomiest are the Large Flat Rate Box (12 × 11 3/4 × 5 1/2 in inside) and Medium Flat Rate Box 2 (13 5/8 × 11 7/8 × 3 3/8 in inside).