Dimensional Weight

Weight calculated from package dimensions rather than actual weight.

Definition

Dimensional weight (also known as volumetric weight or DIM weight) is a pricing technique used by shipping carriers to account for large but lightweight packages. Instead of charging by actual weight alone, carriers calculate an equivalent weight based on the package's volume. The formula divides the package volume by a carrier-specific divisor to get the dimensional weight. Carriers then charge based on whichever is greater: actual weight or dimensional weight.

Why It Matters

Understanding dimensional weight is essential for cost-effective shipping. If your packages are large but light (like pillows, electronics, or packaged clothing), you may be charged by dimensional weight rather than actual weight. Knowing this helps you optimize packaging size and compare carrier rates accurately.

Example

A box measuring 50cm × 40cm × 30cm has a volume of 60,000 cm³. Using a divisor of 5000 (common for express services), the dimensional weight is 60,000 ÷ 5000 = 12 kg. If the box actually weighs only 5 kg, you'll be charged for 12 kg.

Free Tool

Dimensional Weight Calculator

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Related Terms

Volumetric Weight

Another name for dimensional weight, based on package volume.

Divisor (DIM Factor)

The number used to convert volume into dimensional weight.

Chargeable Weight

The weight carriers use to bill you—the greater of actual or dimensional weight.

Frequently Asked Questions

Is dimensional weight the same as volumetric weight?

Yes, dimensional weight and volumetric weight are the same thing. Different carriers use different terms, but the calculation is identical.

Why do carriers use dimensional weight?

Carriers have limited space in vehicles and aircraft. Large, lightweight packages take up valuable space but would be cheap to ship by actual weight alone. Dimensional weight ensures carriers are compensated for the space used.