Dims Calculator
Dimensional weight calculator
Carriers charge for the greater of actual weight and dimensional weight. Enter your box and see the billable weight each carrier will use, before you buy the label.
Billable weight by carrier
| Carrier | Divisor | Dim weight | Actual | Billable |
|---|---|---|---|---|
 USPS | 166 | n/a | 2 lb | 2 lb |
 UPS | 139 | 7 lb | 2 lb | 7 lbDim |
 FedEx | 139 | 7 lb | 2 lb | 7 lbDim |
 DHL Express | 139 | 7 lb | 2 lb | 7 lbDim |
- USPS: Applies only to packages over 1 cubic foot (1,728 in³).
- UPS: Daily Rates. Retail Rates use 139 as well.
- FedEx: Ground, Home Delivery and Express.
- DHL Express: US domestic. International uses 5,000 cm³/kg, the metric equivalent.
How dimensional weight works
Dimensional (dim) weight is length × width × height in inches divided by the carrier's divisor, rounded up to the next pound. The carrier bills whichever is higher: that number or the actual weight, also rounded up. A large, light box therefore costs the same as a heavy small one.
UPS, FedEx and DHL apply dim weight to every package with a divisor of 139. USPS only applies it to packages over one cubic foot and uses 166, which is why USPS is often the cheapest option for bulky but light items. The fastest way to save is a smaller box: shaving an inch off each side of a 12×10×8 box drops its dim weight from 7 lb to 5 lb at 139.
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