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Dimensional Weight Calculator

Enter package length, width and height in inches, actual weight and the carrier dim divisor to get dimensional weight and billable weight. Billable weight is the greater of dim weight and actual weight.

Updated 2026-10-30 · Formula shown · No signup
--Dim weight · lb
--Billable weight · lb

Estimates only; verify on site before ordering or building.

Example

ItemValueUnit
Length20in
Width16in
Height12in
Actual weight30lb
Dim divisor139
Dim weight27.63lb
Billable weight30lb

Where people go wrong

  • Using a 139 divisor with centimeters and kilograms without converting units.
  • Measuring the outer box but ignoring padding that increases dimensions.
  • Applying one carrier's divisor to a carrier that uses a different one.

FAQ

Should the divisor be 139 or 166?

Check the carrier and service rules; 139 is common for US ground, while some express services use 166.

Why is billable weight not always dim weight?

Carriers use the greater of dim and actual weight; light bulky parcels are usually billed on dim weight.