Enter a package's dimensions and weight to see its billable weight — the same dimensional weight math carriers use to set your rate — compared across USPS, UPS, and FedEx Ground.
This tool estimates billable weight using currently published DIM divisors and rounding rules as of publication (updated for USPS's July 12, 2026 divisor change). It is a planning estimate, not a live carrier quote — always confirm actual rates with your carrier or shipping platform before pricing a shipment.
Billable weight = the greater of actual weight or dimensional weight (each dimension rounded up to the next inch, then L×W×H ÷ divisor, rounded up). USPS only applies dimensional pricing to packages exceeding 1,728 cubic inches (1 cubic foot); below that threshold, USPS bills actual weight. Divisors and thresholds can change — verify current figures with each carrier.
For each carrier, we round each dimension up to the next whole inch, then calculate dimensional weight as (Length × Width × Height) ÷ DIM divisor, rounded up to the nearest pound. We then compare that figure to your package's actual weight and report whichever is higher — that's your billable weight. USPS only applies this calculation to packages over 1,728 cubic inches; smaller packages are billed at actual weight. See the full explanation, including USPS's July 2026 divisor change, in our guide on how dimensional weight pricing works, or see the structural differences between carriers in our carrier rate comparison table. If you ship often enough to want this built into your workflow automatically, see our overview of shipping rate calculator tools.