FedEx DIM Weight Calculator — 2026
Dimensional weight for FedEx Ground & Express with the current ÷139 divisor and ceiling rounding, plus the 166 divisor used by FedEx International Economy.
FedEx DIM weight calculator
Enter package dimensions and actual weight to get the chargeable weight.
Ceiling rounding (round up to the next whole pound) since August 2025. DIM applies to all FedEx Ground and Express packages. FedEx International Economy Express uses 166; the 139 divisor is standard for domestic and most express services.
FedEx dimensional weight rules (2026)
| Rule | Value |
|---|---|
| Divisor — Ground & most Express | 139 |
| Divisor — International Economy Express | 166 |
| Rounding — dimensions | Round up to the next whole inch |
| Rounding — DIM weight | Round up to the next whole pound |
| When DIM applies | All FedEx Ground and Express packages |
Packaging tips that reduce DIM weight
- Shave the longest side. Volume is length × width × height — a 1-in reduction on the longest side removes the most volume per inch.
- Use the smallest box that fits with adequate cushioning; FedEx adds no grace for empty space.
- Watch oversized fees. Packages over 130 in in length + girth incur additional handling; check before shipping furniture or large equipment.
- Verify your invoice divisor. If FedEx bills DIM on a 166 divisor for a domestic package, you are overcharged — 139 is the current domestic standard.
Direct answer
• FedEx DIM weight = (L × W × H, each rounded up) ÷ 139 (Ground / Express domestic).
• FedEx International Economy Express uses ÷166.
• Chargeable weight = the greater of actual and DIM weight, rounded up to the next pound.
Source: FedEx dimensional weight page / rate guide, verified 2026-08-19. Commercial rules — confirm on the current FedEx rate sheet.
FAQ
What divisor does FedEx use for dimensional weight?
FedEx uses 139 for FedEx Ground and most Express domestic services, with ceiling rounding (each dimension rounds up to the whole inch; DIM weight rounds up to the whole pound) since August 2025. FedEx International Economy Express uses 166.
How does FedEx calculate chargeable weight?
Chargeable weight = the greater of actual weight and dimensional weight. DIM weight = (L × W × H in inches, each rounded up) ÷ 139 for domestic Ground/Express. FedEx bills on the chargeable weight with ceiling rounding.
Does FedEx round dimensions up or use exact values?
FedEx rounds each dimension up to the next whole inch and rounds the resulting DIM weight up to the next whole pound (ceiling rounding, since August 2025). A 20.2 × 12.0 × 8.9 in box is billed as 21 × 12 × 9 in.