FedEx Dimensional Weight Calculator

Compare actual weight to DIM weight for FedEx.

Formula

DIM weight (lb) = ceil((L × W × H) ÷ 139). Billable weight = max(DIM, actual).

FedEx DIM divisor commonly 139. Confirm current FedEx guidance.

Worked example

18×12×10 in, 5 lb → DIM 16 lb, billable 16 lb.

Length (in) Width (in) Height (in) Actual weight (lb) Preset

Source & last checked

https://www.fedex.com/en-us/shipping/packaging/what-is-dimensional-weight.html

Last checked: 2026-09-25

FAQ

Is the divisor always the same?

Carriers change rules. Confirm on the official source linked below.

Does this quote postage?

No — billable weight only. Rates depend on zone and service.

Why presets?

Common seller packaging sizes so you can compare quickly.

Related tools

USPS DIM weight
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