How to Calculate CBM for Shipping
CBM (Cubic Meter) is the universal measurement for cargo volume in international shipping. Freight forwarders, logistics companies, and manufacturers use CBM to determine container space, shipping costs, and warehouse requirements.
CBM Formula
The CBM calculation formula is straightforward:
CBM = Length (cm) × Width (cm) × Height (cm) ÷ 1,000,000
For example, a box measuring 100 cm × 50 cm × 40 cm = 0.20 CBM. If you have 500 of these boxes, the total is 100 CBM — requiring approximately three 20ft containers or one-and-a-half 40ft containers.
Container Sizes Reference
Standard shipping container capacities:
- 20ft Container: 33.2 CBM, max payload 21,770 kg (48,000 lbs)
- 40ft Container: 67.7 CBM, max payload 26,780 kg (59,040 lbs)
- 40ft High Cube: 76.3 CBM, max payload 26,580 kg (58,600 lbs)
Volumetric Weight vs Actual Weight
Carriers charge based on whichever is greater: the actual weight or the volumetric weight. Volumetric weight is calculated as (L × W × H in cm) ÷ 5,000. For lightweight but bulky items like plastic containers, volumetric weight often exceeds actual weight, making CBM calculations critical for cost planning.
Tips for Optimizing Container Loads
- Stack containers vertically to maximize height utilization
- Use nestable or stackable containers like MonsterCombo® bulk bins to reduce dead space
- Consider insulated containers for temperature-sensitive cargo
- Check weight limits — a container full of heavy goods may reach its weight limit before its volume limit