Shipping Dimensional Weight Calculator
Dimensional or volumetric weight estimates how much space a package occupies relative to a carrier-defined divisor. The chargeable basis is often the greater of dimensional and actual weight, subject to carrier-specific rules.
How to use this calculator
- Enter external parcel dimensions, the carrier divisor and actual scale weight.
- Check that all inputs use the same units, period and population scope.
- Change one assumption at a time when comparing scenarios.
Formula used by shipping dimensional weight calculator
Dimensional weight = length × width × height ÷ carrier divisor; estimated billable weight = max(actual, dimensional).
- Dimensional weight = length × width × height ÷ carrier divisor; estimated billable weight = max(actual, dimensional).
- Carriers may round dimensions, divisor and chargeable weight according to route, service and contract terms.
- The tool validates inputs and rounds displayed figures for readability; it does not validate assumptions against external records.
Worked examples
Worked example
A 40 × 30 × 20 cm parcel has 24,000 cm³ volume; with divisor 5,000, dimensional weight is 4.8 kg.
24,000 ÷ 5,000 = 4.8 kg; compare with actual scale weight.
The calculator returns dimensional and estimated chargeable weight.
Understanding the result
Dimensional or volumetric weight estimates how much space a package occupies relative to a carrier-defined divisor. The chargeable basis is often the greater of dimensional and actual weight, subject to carrier-specific rules.
Carriers may round dimensions, divisor and chargeable weight according to route, service and contract terms.
Important notes
Carriers may round dimensions, divisor and chargeable weight according to route, service and contract terms.
Treat the result as an estimate from the entered assumptions. For safety, legal, engineering, health or commercial decisions, verify relevant specifications and professional guidance.
Frequently asked questions
Which divisor should I use?
Use the divisor specified by your carrier and service; it is not universal.
Does this calculate the shipping price?
No. Price also depends on service, route, zone, surcharges and carrier rules.
How should I interpret this result?
Carriers may round dimensions, divisor and chargeable weight according to route, service and contract terms.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.