Calculator
Dimensional weight calculator
Billable weight from length, width, height and actual weight at any divisor, in inches or centimeters, with each carrier’s surcharge minimums for your ship date.
Short answer. Round each side up to the next inch, multiply, divide by the divisor and round up to the next pound. At published daily rates UPS and FedEx use 139. Billable weight is the greater of actual and dimensional weight, unless a surcharge minimum (40, 50 or 90 lb) is higher.
Package
At 139: 24 × 18 × 12 in → 38 lb DIM, billable 38 lb.
Caveats.
- The published divisor is a default. Your agreement may specify another; use “Custom”.
- UPS states 139 for Daily Rates and 166 for Retail Rates (UPS dimensional weight FAQ; 2026 Retail Rates guide). FedEx uses 139 (Service Guide 2026, p. 135).
- Some carrier services use different rules (for example, minimum package size). This tool covers the general dimensional weight rule only.
Questions
What divisor do UPS and FedEx use?
139 at UPS Daily Rates and FedEx published rates. UPS uses 166 for Retail Rates. Contracts can set other divisors.
Do carriers round dimensions?
Yes. Each side is rounded up to the next whole inch before dimensional weight is calculated, and dimensional weight is rounded up to the next pound.
Data notice. Figures are published list amounts we transcribe from public UPS and FedEx documents. They can contain errors and are provided as is; we are not responsible for errors or omissions. Confirm with the carrier before relying on any figure. How we get our data · Disclaimer · Report an error