Air Freight Dim Weight Calculator

Air freight dim weight is calculated as packed length x width x height in centimeters x quantity divided by the carrier divisor, usually 6000 for standard air freight or 5000 for express.

How the calculation works

Dim weight, dimensional weight, volumetric weight, and volume weight are often used for the same air cargo concept: converting the space a shipment occupies into a billable weight number. This page emphasizes the divisor because the same cartons can produce different dim weights under air freight, express, and parcel rules.

air freight dim weight kg = length cm x width cm x height cm x quantity / divisor

A 6000 cm3/kg divisor is a common planning rule for standard international air freight. A 5000 cm3/kg divisor is stricter and common in express courier pricing. The 139 in3/lb divisor is the inch-pound version often seen in parcel rating and is close to the 5000 cm3/kg rule.

Dim weight is not automatically the final billing weight. For the final chargeable weight, compare dim weight with actual gross weight and use the higher number.

FAQ

What is air freight dim weight?

Air freight dim weight is a shipment’s volume converted into kilograms. It lets carriers charge light bulky cargo for the aircraft space it uses.

What is the air freight dim weight formula?

The metric formula is length x width x height in centimeters x quantity divided by the divisor. For standard air freight, the divisor is commonly 6000.

Is dim weight different from volumetric weight?

In most freight quoting, dim weight and volumetric weight mean the same thing. Both describe volume converted into weight for billing comparison.

Why does the divisor matter?

The divisor controls how strict the calculation is. A 5000 divisor produces 20% more dim weight than a 6000 divisor for the same packed cargo.

When should I use 6000?

Use 6000 cm3/kg for standard forwarder-managed international air freight unless your quote, airline, or contract gives a different divisor.

When should I use 5000?

Use 5000 cm3/kg for many express courier, small parcel, and ecommerce air services, or whenever that divisor appears on the carrier quote.

What does 139 in3/lb mean?

It means dimensional weight in pounds is length x width x height in inches divided by 139. It is commonly used in inch-pound parcel rating and is roughly equivalent to a 5000 cm3/kg divisor.

Should I enter product dimensions or carton dimensions?

Enter the outer packed carton, crate, or pallet dimensions. Carriers measure the freight as shipped, not the product inside the box.

Comparison

Dated facts

As of May 2026, standard international air freight planning still commonly uses the 6000 cm3/kg divisor, while many express courier and parcel-style services use 5000 cm3/kg or the close inch-pound equivalent of 139 in3/lb. A shipment below about 166.7 kg per CBM is usually volume-sensitive under the 6000 rule; below 200 kg per CBM, it is volume-sensitive under the 5000 rule. Final billing can still change due to carrier dimension rounding, minimum chargeable weight, and oversized-piece rules.