FedEx Dimensional Weight Calculator
FedEx’s U.S. dimensional-weight guidance says to multiply package dimensions in inches and divide by 139 for U.S., Puerto Rico, and international shipments.
FedEx DIM weight formula
FedEx instructs shippers to round each package measurement to the nearest whole inch, multiply length × width × height, and divide by 139 in its U.S. guidance.
If the packed box weighs 18 lb on a scale, dimensional weight is higher. If it weighs 30 lb, actual weight is higher. Enter your own FedEx rate per billable pound to estimate cost.
Metric FedEx calculations
FedEx guidance in some metric markets describes 5000 as a common divisor and 139 as its imperial equivalent. Market and service documentation can differ, so use the divisor published for the origin, destination, and product you selected.
Official FedEx references
See FedEx U.S. dimensional-weight guidance and the current service guide for your market. DimWeightPro estimates weight and cost; the carrier quote remains authoritative.
Frequently asked questions
What DIM divisor does FedEx use in the U.S.?
FedEx’s U.S. guidance publishes divisor 139 for U.S., Puerto Rico, and international shipments.
Does FedEx round package dimensions?
FedEx’s published U.S. steps say to round each measurement to the nearest whole inch before calculating cubic size.
Can my FedEx billed weight differ from this estimate?
Yes. Service, market, contract, rounding, minimums, and other shipment rules can change the billed result.