Observed arrival · 2026-09-25
DimWeight Lab: a calculator for the box that ships heavier than it weighs
A free calculator compares a package’s actual and dimensional weight to estimate the billable weight a carrier may use.
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- For
- Ecommerce sellers and warehouse teams
- Worth noticing
- It compares configurable 139/166 and 5,000/6,000 profiles, but excludes oversize and other surcharges.
Field notes
The form supports either inches and pounds or centimeters and kilograms, plus identical-package counts and an optional cost per billed pound. Its sample output includes a suggested reduction to the longest side, while the accompanying guidance cautions users to check their own carrier agreement for divisors, rounding, size limits, and surcharges. A print control is also present.
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