How this calculator works
Raw dimensional weight = measured length × width × height ÷ divisor. If dimension rounding is selected, the adjusted dimensions are used before the billing-weight rule is applied per package.
Using this result
The larger of the scale weight and dimensional weight is the comparison weight most likely to affect billing.
Next step: If dimensional weight is higher, test a smaller outer carton and confirm the divisor and rounding rule with your service.
Worked example
A 40 × 30 × 20 cm parcel with a 5,000 divisor has a dimensional weight of 4.8 kg. If it weighs 3.2 kg, size drives the comparison.
How to measure
- Measure the outside of the sealed carton.
- Include any bulges, handles or protruding packaging.
- Use the same unit system as the divisor.
Common mistakes
- Measuring the product instead of the packed carton.
- Assuming one divisor applies to every carrier.
- Rounding dimensions down before calculating.
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.
Formula implementation and worked example reviewed September 9, 2026. See the methodology and sources.