How this calculator works
Girth = 2 × (width + height). Combined size = longest side + girth.
Worked example
A 36 × 14 × 12 inch parcel has a 52 inch girth and an 88 inch combined length plus girth.
How to measure
- Identify the single longest side as length.
- Measure width and height around the thickest point.
- Use outermost packed dimensions.
Common mistakes
- Using all three sides in the girth formula.
- Not assigning the longest side as length.
- Comparing against a limit from a different service.
Planning note: This result is an estimate, not a carrier quote. Equipment, services, limits and rounding rules can vary. Confirm operational decisions with the relevant provider.