Air cargo is commonly rated on the greater of actual gross weight and volumetric weight. A 6,000 cm³/kg divisor corresponds to a break-even density of about 166.7 kg/m³.
Chargeable kg = max(gross kg, length × width × height × pieces ÷ divisor)Gross weight vs volumetric weight
Gross weight is what the shipment weighs on a scale. Volumetric weight converts the shipment's occupied cube into an equivalent pricing weight. The higher figure becomes the chargeable basis under a standard weight-or-volume comparison.
For general air cargo, 6,000 cm³/kg is a widely used benchmark. Express networks may use 5,000 cm³/kg, and negotiated forwarder rules can differ.
Break-even density
The break-even density is 1,000,000 divided by the divisor. At a divisor of 6,000, the break-even point is approximately 166.7 kg/m³. Below that density, volume tends to govern; above it, actual weight tends to govern.
Rounding and minimum charges
This calculator intentionally shows the mathematical comparison before carrier-specific minimums, rate breaks and document fees. Airlines and forwarders can round dimensions, round the final chargeable weight, rate each piece differently or apply a minimum charge. Confirm the exact tariff or quotation used for your shipment.
Frequently asked questions
What divisor should I use for air freight?
A 6,000 cm³/kg divisor is a common general-air-cargo benchmark. Express courier services often use 5,000 cm³/kg. Always use the divisor in your quotation or tariff.
What is chargeable weight?
It is the pricing weight used for the shipment, commonly the greater of actual gross weight and volumetric weight.
Why is my chargeable weight higher than my scale weight?
Your cargo occupies more space per kilogram than the selected volumetric rule allows, so volume becomes the pricing basis.
Does the calculator include air freight rates?
No. It calculates the chargeable kilograms only. Multiply by the applicable rate and add minimums, security fees, fuel and other charges separately.
Sources & verification
Verify carrier-sensitive rules against the source governing your shipment.
Formula reviewed September 29, 2026 Representative values and boundary cases are tested automatically.