CBM and volumetric weight formulas
| Measure | Formula | Carton 60 × 40 × 40 cm |
|---|---|---|
| CBM | L × W × H (cm) ÷ 1,000,000 | 0.096 m³ |
| Cubic feet | CBM × 35.315 | 3.39 ft³ |
| Volumetric weight, air (÷6,000) | L × W × H (cm) ÷ 6,000 | 16 kg |
| Volumetric weight, courier (÷5,000) | L × W × H (cm) ÷ 5,000 | 19.2 kg |
Air and express carriers charge the greater of actual and volumetric weight. Divisors vary by carrier, so confirm yours before quoting.
How many cartons fit in a container?
The calculator assumes 85% of a container’s internal volume is usable, to allow for gaps and stacking. Real loading depends on carton size, pallets and stacking rules.
| Container | Approx. internal volume | Usable at 85% |
|---|---|---|
| 20ft standard | 33.2 m³ | 28.2 m³ |
| 40ft standard | 67.7 m³ | 57.5 m³ |
| 40ft high cube | 76.3 m³ | 64.9 m³ |
The number of containers considers both volume and maximum payload; heavy goods can reach the weight limit before the container is full.
Quoting an export order? Choose the right delivery rule with the Incoterms guide.
Frequently asked questions
How do I calculate CBM?
Multiply length × width × height in centimetres and divide by 1,000,000. A 60 × 40 × 40 cm carton is 0.096 m³; 100 cartons are 9.6 m³.
How many CBM fit in a 20ft container?
A 20ft standard container has about 33 m³ of internal space; in practice around 25–28 m³ of cartons fit, depending on carton size and stacking.
How is volumetric weight calculated for air freight?
The common formula is L × W × H in centimetres ÷ 6,000. Express couriers often use 5,000. You pay for the greater of actual and volumetric weight.
Can I use inches and pounds?
Yes. Switch the units to inches and pounds; results are shown in cubic feet and pounds as well as metric units.
Last updated: 31 October 2026 · By the Offerneta team