About the DIM Weight Calculator

DIM Weight Calculator is an independent project that makes dimensional-weight formulas easier to understand and compare. It is not affiliated with UPS, FedEx, DHL, or Canada Post.

The calculator turns publicly available carrier guidance into transparent estimates. Because service, account, destination, and rate type can change the final charge, every result links back to a clear methodology and should be confirmed with the carrier before shipping.

Editorial Process

We link to primary carrier documentation, state the assumptions used by the calculator, and record material formula changes in version history. Carrier references were last reviewed on July 14, 2026.