CBM Calculator
Calculate cubic meters (CBM) for your cargo. Enter dimensions and quantities for instant freight volume calculations.
Enter Dimensions
| Length (cm) | Width (cm) | Height (cm) | Qty | |
|---|---|---|---|---|
How to Calculate CBM
CBM (Cubic Meter) is the standard measurement for cargo volume in international shipping. It's essential for getting accurate freight quotes and planning container loads.
The formula is straightforward:
If your dimensions are in centimeters, divide the result by 1,000,000. If in inches, multiply by 0.000016387.
Worked Example
Example: Calculating CBM for a LCL shipment
Carton 1: 40cm × 30cm × 20cm, Qty: 5
- Volume per carton = 40 × 30 × 20 = 24,000 cm³
- CBM per carton = 24,000 ÷ 1,000,000 = 0.024 m³
- Total for 5 cartons = 0.024 × 5 = 0.12 CBM
Carton 2: 60cm × 40cm × 40cm, Qty: 3
- Volume per carton = 60 × 40 × 40 = 96,000 cm³
- CBM per carton = 96,000 ÷ 1,000,000 = 0.096 m³
- Total for 3 cartons = 0.096 × 3 = 0.288 CBM
Total shipment CBM: 0.12 + 0.288 = 0.408 CBM
This would fit in an LCL (Less than Container Load) shipment.
Container CBM Reference
| Container Type | Internal Dimensions | Volume (CBM) | Practical Capacity |
|---|---|---|---|
| 20ft Standard | 5.9m × 2.35m × 2.39m | ~33 CBM | 25-28 CBM |
| 40ft Standard | 12.03m × 2.35m × 2.39m | ~67 CBM | 55-60 CBM |
| 40ft High Cube | 12.03m × 2.35m × 2.69m | ~76 CBM | 65-70 CBM |
20ft Standard
- Dimensions
- 5.9m × 2.35m × 2.39m
- Volume
- ~33 CBM
- Practical
- 25-28 CBM
40ft Standard
- Dimensions
- 12.03m × 2.35m × 2.39m
- Volume
- ~67 CBM
- Practical
- 55-60 CBM
40ft High Cube
- Dimensions
- 12.03m × 2.35m × 2.69m
- Volume
- ~76 CBM
- Practical
- 65-70 CBM
Practical capacity is lower due to cargo shape and stacking limitations.
What is CBM?
CBM stands for Cubic Meter (m³), the universal unit of volume used in international freight shipping. One CBM equals 1 meter × 1 meter × 1 meter, or 1,000,000 cubic centimeters. It is the standard measurement that carriers, freight forwarders, and warehouses use to quote rates and allocate space.
CBM matters because shipping rates are quoted per cubic meter for sea freight (LCL), air cargo, and warehouse storage. Understanding your cargo's CBM allows you to compare quotes accurately, plan container loads efficiently, and avoid unexpected surcharges.
A common misconception is that CBM is the same as dimensional weight (also called volumetric weight). While both involve volume, they serve different purposes: CBM measures pure volume in cubic meters, whereas dimensional weight converts volume to an equivalent weight using a divisor (typically 5,000 for air freight or 6,000 for parcel carriers). CBM is used for freight pricing; dimensional weight is used by parcel and express couriers to price lightweight but bulky packages.
Container Capacity Details
| Container Type | Internal L × W × H (m) | Capacity (CBM) | Max Payload (kg) |
|---|---|---|---|
| 20ft Standard | 5.9 × 2.35 × 2.39 | ~33.2 | ~28,200 |
| 40ft Standard | 12.0 × 2.35 × 2.39 | ~67.7 | ~26,700 |
| 40ft High Cube | 12.0 × 2.35 × 2.69 | ~76.3 | ~26,460 |
20ft Standard
- L × W × H (m)
- 5.9 × 2.35 × 2.39
- Capacity (CBM)
- ~33.2
- Max Payload
- ~28,200 kg
40ft Standard
- L × W × H (m)
- 12.0 × 2.35 × 2.39
- Capacity (CBM)
- ~67.7
- Max Payload
- ~26,700 kg
40ft High Cube
- L × W × H (m)
- 12.0 × 2.35 × 2.69
- Capacity (CBM)
- ~76.3
- Max Payload
- ~26,460 kg
Practical loading capacity is typically 80-90% of stated CBM due to cargo shape and stacking limitations.
Common CBM Calculation Mistakes
- Forgetting to convert units — Mixing centimeters and meters in the same calculation is one of the most frequent errors. Always ensure all dimensions use the same unit before multiplying.
- Measuring outer vs inner dimensions — Freight carriers price based on outer carton dimensions, not the product dimensions inside. Always measure the outside of the shipping carton.
- Ignoring irregular shapes — For non-rectangular cargo, measure at the longest point in each dimension (length, width, and height). The bounding box determines the space your cargo occupies.
- Not accounting for palletization — Pallet overhang, stacking restrictions, and pallet height all affect the usable CBM. Always factor in pallet dimensions when calculating container loads.
Frequently Asked Questions
What is CBM?
CBM stands for Cubic Meter (m³). It's the standard unit for measuring cargo volume in international shipping. 1 CBM equals 1 meter × 1 meter × 1 meter, or 1,000,000 cubic centimeters.
How do I calculate CBM?
To calculate CBM, multiply the length × width × height of your cargo in meters. If your dimensions are in centimeters, multiply L × W × H and divide by 1,000,000. For inches, multiply the volume by 0.000016387.
Why is CBM important for shipping?
CBM is crucial for calculating shipping costs, especially for sea freight (LCL and FCL). Carriers use CBM to determine how much space your cargo will occupy in a container, which directly affects pricing.
What is the CBM of a 20ft container?
A standard 20ft container has approximately 33 CBM of usable space (internal dimensions: 5.9m × 2.35m × 2.39m). However, practical loading capacity is typically 25-28 CBM depending on cargo shape.
What's the difference between CBM and volumetric weight?
CBM measures actual volume in cubic meters. Volumetric weight (or dimensional weight) converts volume to a weight equivalent using a divisor, used by couriers to price lightweight but bulky packages. Use our dimensional weight calculator for volumetric calculations.
How do I convert cubic feet to CBM?
Divide cubic feet by 35.3147. For example, 100 cubic feet ≈ 2.83 CBM.
What is the minimum CBM for LCL shipments?
Most freight forwarders have a minimum charge of 1 CBM for LCL shipments, even if your cargo is smaller. Some may go as low as 0.5 CBM with a minimum charge fee.
Can I mix different sized cartons in one CBM calculation?
Yes, calculate the CBM for each carton type separately (L × W × H × quantity), then add them together for the total shipment CBM. Our calculator above supports multi-piece entries for exactly this purpose.