Dimensional Weight Calculator

How to use the Dimensional Weight Calculator

Estimate volumetric shipping weight using package length, width, height and a carrier-specific DIM divisor.

Formula

Dimensional weight = length × width × height ÷ divisor; rounded DIM weight = round up(dimensional weight).

Worked example

A 40 × 30 × 20 cm package with an illustrative divisor of 5,000 gives 4.8 kg dimensional weight and 5 rounded DIM units.

Interpretation and limitations

Use dimensions and divisor from the same unit system. The rounded output is dimensional weight only; actual billable weight may be the greater of physical and dimensional weight, subject to carrier rules.

Dimensional Weight questions

Which divisor should I use?

Use the carrier and service-specific divisor. The example divisor is not a universal shipping standard.

Does the result include actual package weight?

No. Physical weight is not an input. Compare it separately and apply the carrier’s rounding and billing rules.

Continue your calculation

For the next step, use the Shipping Cost Per Order Calculator or the Free Shipping Threshold Calculator. Review each tool’s input definitions before carrying a result into another calculation.

Frequently asked questions

Is this calculator free?

Yes. It runs in your browser and does not require an account.

How should I use the result?

Use the result as a planning estimate and verify business-critical decisions against your source records.