What DIM factor should I use?

5000 cm³/kg for air and express courier; 4000 cm³/kg for road and ground freight. Always confirm with your carrier.

Why can DIM weight exceed actual weight?

Light, low-density packages take up space disproportionate to their weight; the DIM charge compensates the carrier for that lost capacity.

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Dimensional Weight Calculator

Calculate volumetric (DIM) weight and find your billable shipping weight. Add multiple packages for cumulative totals.

Packages

Units

DIM Factor

Custom Factor

Cumulative Totals · 0 packages

Total actual

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Total DIM

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Total volume

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Billable weight
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Carriers bill the greater of actual or dimensional weight. The highlighted value is what you'll typically be charged for.

Rates and DIM factors vary by carrier and route. Always confirm pricing directly with your carrier before shipping.

How to use

Pick your units (cm/kg or in/lb) and the DIM factor your carrier uses.
Enter package dimensions and actual weight. Results update live for each package.
Add additional packages with the button — cumulative totals appear in the right-hand card.

FAQ

A pricing weight calculated as L × W × H ÷ DIM factor. Carriers bill whichever is greater — actual weight or this volumetric figure.

Industry-standard defaults are 5000 cm³/kg for air freight and express courier, and 4000 cm³/kg for road/ground. Some carriers use different numbers — confirm before shipping.

Light bulky items (pillows, foam padding) take up disproportionate space. The DIM charge compensates the carrier for the capacity used.