FedEx dimensional (DIM) weight pricing is based on how much space a package takes up relative to its actual weight.
How to calculate FedEx DIM weight?
1. Measure the package
Measure the length × width × height in inches.
Use the longest point for each side and round each measurement up to the nearest whole inch.
2. Calculate cubic size
Cubic Inches = L x W x H
3. Divide by the DIM divisor
For most U.S. FedEx Ground and Express shipments, the DIM divisor is: 139
Dim weight = L x W x H/139
4. Round up the result
Always round the result up to the next whole pound.
Important Notes:
- DIM pricing generally applies to all packages (not just large ones).
- International shipments may use different rules.
- Very large packages may incur Additional Handling or Oversize fees.
- Contracted FedEx accounts may have custom DIM divisors.