Dimensional Weight Calculator

Method and assumptions

Carriers bill the greater of actual and dimensional weight. Measure the outer packed carton and use the divisor stated in the current carrier contract.

Worked scenario

Measure the outside of the packed parcel, not the product. Enter length, width, height, actual weight, package count and the divisor from the carrier tariff. Compare a compact package with a lightly packed box using the same product weight to see how packaging design changes chargeable weight.

How to interpret the result

Carriers may round each dimension, each package and the final chargeable weight in a defined sequence. A simple volume calculation cannot reproduce a tariff unless those rules are matched. Use the calculator for quote validation and packaging scenarios, then confirm billed weight against the carrier invoice.

Input reference

Unit system

Example default: Metric (cm / kg)

Packed length

Example default: 40

Packed width

Example default: 30

Packed height

Example default: 25

Actual weight

Example default: 4.5

Metric divisor

Example default: 5000

Imperial divisor

Example default: 139

Carrier rounding step

Example default: 0.5

Common mistakes

• Entering internal carton or product dimensions.
• Using a divisor from another service, unit system or contract.
• Summing parcel dimensions before package-level rounding.

Before using the result

1. Photograph and record packed external dimensions.
2. Confirm divisor and rounding with the active tariff.
3. Compare estimated and invoiced weight after shipment.

Questions to check before deciding