Irish Calculators
Everyday money

Chargeable and Volumetric Weight Calculator

Calculate the greater of actual and volumetric weight for one parcel or a batch of identical parcels. Supply the carrier divisor and apply any billing increments separately; no shipping price is quoted.

Runs privately in your browserMethod reviewed

Your numbers

cm
cm
cm
kg
cm³/kg
Your figures stay on this device.

How the calculation works

A parcel can consume carrier capacity because it is heavy or because it is bulky. Chargeable weight compares those two measures using the volumetric divisor supplied by the carrier, without attempting to determine a shipping price.

Volumetric kg = length × width × height in cm ÷ divisor. Chargeable kg = max(actual, volumetric) per parcel × parcel count.

  1. Calculate the parcel volume

    Multiply length, width and height in centimetres. Include the outer package rather than only the dimensions of the item inside.

  2. Convert volume to equivalent weight

    Divide cubic centimetres by the carrier divisor to obtain volumetric kilograms. This is a billing convention, not the physical mass of the parcel.

  3. Choose the larger measure

    Compare actual and volumetric weight for one parcel, then multiply the larger amount by the identical-parcel count. The output remains unrounded for carrier billing purposes.

Worked example: Bulky parcel

Sample inputs demonstrate the method. They are not a forecast or product offer.

The first example measures 50 by 40 by 30 centimetres, giving 60,000 cubic centimetres. Dividing by 5,000 gives 12 volumetric kilograms, which exceeds the actual 8 kilograms, so unrounded chargeable weight is 12.

Length per parcel (cm)
50
Width per parcel (cm)
40
Height per parcel (cm)
30
Actual weight per parcel (kg)
8
Carrier volumetric divisor (cm³/kg)
5000
Identical parcels
1

Expected result

Unrounded chargeable weight
12
Worked example: Heavy parcels

Sample inputs demonstrate the method. They are not a forecast or product offer.

Length per parcel (cm)
20
Width per parcel (cm)
20
Height per parcel (cm)
20
Actual weight per parcel (kg)
10
Carrier volumetric divisor (cm³/kg)
5000
Identical parcels
2

Expected result

Unrounded chargeable weight
20

Understanding your result

A bulky parcel may have chargeable weight above its scale weight because its dimensions dominate. A dense parcel may instead be charged on actual weight.

The carrier may impose minimums, billing increments, service limits or surcharges. Apply those separately; the tool does not know their tariff or silently round to a carrier's next increment.

Questions you might have

What does this chargeable weight calculator include?

Calculate the chargeable weight of identical parcels from their actual weight, dimensions and your carrier’s volumetric divisor.

Which assumptions should I check?

Use the divisor in your carrier contract. Mixed parcels must be calculated individually; rounding conventions vary by carrier.

Choosing the right inputs

Carrier volumetric divisor
Use the divisor stated for the particular service and centimetre-based dimensions. A divisor from another carrier or transport mode can change the result.
Actual weight per parcel
Enter actual weight per parcel in kilograms, not the combined weight of a batch when several identical parcels are selected.
Identical parcels
Enter a whole number of identical parcels. Packages with different dimensions or weights must be calculated separately.

Common mistakes to avoid

  • Do not enter millimetres or metres in centimetre fields.
  • Do not treat the unrounded chargeable kilograms as a currency price.

Assumptions to check

  • Use the divisor in your carrier contract. Mixed parcels must be calculated individually; rounding conventions vary by carrier.

Sources and method

Read our calculation and testing approach.