Dimensional/Weight

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FedEx dimensional weight

FedEx bills the greater of what your parcel weighs and what its size implies. Below is the divisor, the rounding rule most calculators ignore, and a worked example you can check against your own invoice.

FedEx — US & intl (in / lb)

FedEx publishes rounding to the NEAREST whole inch, and one divisor across US, Puerto Rico and international. FedEx does not publish a result-rounding increment on this page, so none is applied here — your invoice may round up to the next whole pound.

Worked example

Box as measured18 × 14 × 12 in
Billed dimensions18 × 14 × 12 in
Volume3,024 in³
Divisor139
Dimensional weight21.76 lb
Actual weight6 lb
Chargeable21.76 lb

Divisor 139, checked 2026-08-24. Carrier source

FedEx rounds every measurement to the nearest whole unit, and publishes no result-rounding increment on this schedule. In the example above that costs you 15.76 lb of empty space — you pay for 21.76 lb on a parcel weighing 6 lb.

FedEx — International (cm / kg)

For metric, FedEx rounds each measurement UP to the next-higher centimetre. FedEx also publishes 305 for inches-to-kilograms.

Worked example

Box as measured46 × 36 × 30 cm
Billed dimensions46 × 36 × 30 cm
Volume49,680 cm³
Divisor5,000
Dimensional weight9.94 kg
Actual weight8 kg
Chargeable9.94 kg

Divisor 5,000, checked 2026-08-24. Carrier source

FedEx rounds every measurement up to the next whole unit, and publishes no result-rounding increment on this schedule. In the example above that costs you 1.94 kg of empty space — you pay for 9.94 kg on a parcel weighing 8 kg.

Try it with your own box

The calculator applies FedEx's own rounding rule, then works backwards to the largest box that would still bill on actual weight — the number that tells you how much packaging headroom you have before dimensional weight takes over.

Open the calculator →

Negotiated rates differ. The divisors above are the published figures. Contract customers frequently have a different divisor written into their agreement, and that one governs your invoice. Check your rate card before budgeting from these numbers.

Other carriers

Every divisor side by side, with rounding rules and the figures we chose not to publish: carrier divisor cheat sheet. For Q4, see the peak surcharge tracker and exposure calculator.