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What will they bill you for this box?
Carriers don’t always charge the weight on the scale. If the carton is bulky, they charge dimensional weight. Type the sides and the scale weight — the billable number ticks up on the ticket.
Divisors checked 12 Nov 2026 from the carriers’ published dimensional-weight rules. Your contract, country and service can use a different divisor. This is a calculator, not a shipping quote.
Why this number matters
A 16×12×12 inch carton that weighs 4 lb has a USPS dim weight of 14 lb (divisor 166) and a UPS/FedEx dim weight of 17 lb (divisor 139). That is the weight you pay for if the scale reads less. The formula is the same everywhere: length × width × height, divided by the carrier’s divisor, rounded up, then compared with the scale weight. The higher figure is billable.
What dimensional weight is · Current divisors · How to shrink the bill