Stop paying to ship air
Enter the box size and weight to see its dimensional weight and the weight a carrier bills. The calculator shows which side to shrink so the box bills on what it actually weighs.
Dimensional Weight Calculator
No sign-up. What you type never leaves your device.
Carriers change divisors, rounding rules and size thresholds, and contract rates can use different numbers. Check your carrier’s current rates or your account’s rate sheet before you rely on a result.
How it’s calculated
Dimensional weight = length × width × height ÷ divisorBillable weight = the greater of actual weight and dimensional weight- With rounding on, a fraction goes up to the next whole pound or kilogram, so 6.47 lb becomes 7 lb.
- The divisor is the volume a carrier counts as one pound or kilogram. A smaller divisor means a higher dimensional weight.
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Dimensional weight
Length × width × height ÷ divisor, in inches and pounds or centimeters and kilograms.
Billable weight
The greater of actual and dimensional weight, per box and for the whole shipment.
Carrier presets
UPS, FedEx and USPS divisors, each with where it was published. Or type your own.
Carrier rounding
Round each side up to a whole inch or centimeter, and the weight up to a whole pound or kilogram.
Shrink tip
Shows which side to cut and how short it needs to be to bill on actual weight.
Private
The math runs in your browser. Nothing is saved or sent.
Done in 3 steps
Enter the box
Length, width, height, actual weight and the number of boxes.
Pick a divisor
Choose a carrier preset or type the divisor from your rate sheet.
Read the result
Dimensional weight, billable weight and a tip on which side to shrink.