USPS Dimensional Weight Calculator

Compare actual weight to DIM weight for USPS.

Formula

DIM weight (lb) = ceil((L × W × H) ÷ 166). Billable weight = max(DIM, actual).

USPS DIM divisor commonly 166 for retail Priority. Confirm current USPS pricing.

Worked example

18×12×10 in, 5 lb → DIM 14 lb, billable 14 lb.

Source & last checked

https://www.usps.com/business/prices.htm

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.

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