Compare UPS and FedEx on their published rules and they’re closer than most comparisons claim. Both divide by 139, both round every fraction of an inch up, and their Additional Handling and oversize thresholds are the same numbers. The real differences are UPS’s Retail divisor, a few packaging details, and the surcharge amounts. Everything below comes from the UPS 2026 Rate and Service Guide (Daily and Retail Rates, updated 7 September 2026) and the FedEx Service Guide 2026.
The divisors
| Rate type | UPS | FedEx |
|---|---|---|
| Account / daily rates (US and international) | 139 in³/lb | 139 in³/lb |
| Retail (counter) rates, US domestic | 166 in³/lb | 139 in³/lb |
| Retail (counter) rates, export | 139 in³/lb | 139 in³/lb |
If you drop domestic packages at a UPS Store and pay retail, your dimensional weight is about 16% lower than the same box on a UPS account (UPS Retail Rates guide, p. 19).
Rounding
Both round up. UPS: measure each side at its longest point and round every fraction up to the next whole inch (1.1 becomes 2), with a 1-inch minimum per side; round any fraction of a pound up. FedEx: “any fraction of an inch is rounded up to the next-higher inch”, effective 18 August 2025 (Service Guide p. 135). Both print the dimensions they measured on the label (how to read a FedEx label), so you can check what you were billed for. A 12.1-inch side costs you 13 inches with either carrier.
Size thresholds, side by side
| Rule (US domestic) | UPS | FedEx |
|---|---|---|
| Additional Handling — size | Longest > 48 in, second-longest > 30 in, L+G > 105 in, or > 10,368 in³ | Same four lines |
| Minimum billable weight (size-based AH) | 40 lb | 40 lb |
| Additional Handling — weight | > 50 lb (55 lb international) | > 50 lb (55 lb international) |
| Soft-pack limit (poly bags, mailers) | 18 × 14 × 6 in | 18 × 13 × 5 in |
| Large Package / Oversize | L+G > 130 in, length > 96 in, > 110 lb, or > 17,280 in³ | Same four lines |
| Minimum billable weight (Large Package / Oversize) | 90 lb | 90 lb |
| Maximum | 150 lb, 108 in, 165 in L+G | 150 lb, 108 in, 165 in L+G |
UPS also counts packages 1 inch or less in height (routed through its irregular sortation) as Additional Handling. Sources: UPS guide pp. 179–181; FedEx Service Guide pp. 127–129. An earlier version of this article claimed FedEx’s longest-side trigger was 96 inches and that UPS had no 105-inch trigger; both carriers’ 2026 guides show otherwise.
2026 surcharge amounts
| Surcharge (US domestic, per package) | UPS Daily Rates | FedEx |
|---|---|---|
| Residential — ground | $6.50 | $6.45 |
| Residential — air / express | $7.00 | $6.95 |
| Delivery area — residential / extended | $6.55 / $8.85 | $6.60 / $8.80 |
| Delivery area — commercial / extended | $4.50 / $5.70 | $4.45 / $5.55 |
| Additional Handling — size (by zone) | $30.00–$40.50 | $29.50–$40.75 |
| Additional Handling — weight | $46.50–$58.75 | $46.00–$58.75 |
| Additional Handling — packaging | $26.75–$33.75 | $26.50–$33.75 |
| Large Package / Oversize | $219.50–$286.00 commercial; $254.50–$331.00 residential | $255–$330 |
| Over maximum / Unauthorized | $1,875.00 | $1,875 (Ground) |
FedEx figures: FedEx 2026 surcharge and fee changes and the Service Guide. List prices only — contract discounts on surcharges vary widely.
So which should you choose?
- Paying retail at a counter, domestic? UPS Retail’s 166 divisor gives a lower dimensional weight than 139.
- Large commercial-address packages? UPS’s commercial Large Package rate ($219.50–$286.00) is below FedEx’s US Oversize charge ($255–$330); for residential deliveries they’re close.
- Soft packs? UPS allows a slightly bigger poly mailer (18 × 14 × 6 in vs 18 × 13 × 5 in) before Additional Handling.
- Long items? No escape by switching: both start Additional Handling above 48 in with a 40 lb minimum billable weight.
The practical recommendation
On list rules the two carriers are nearly identical, so the decision comes down to your contract rates and your delivery mix. Run a sample of real packed boxes through both, add the surcharges that apply, and compare.