CBM to MT Calculator
Convert cubic meters (CBM) into metric tons (MT) using material density.
What does CBM to MT mean?
CBM stands for cubic meter, which is a unit of volume. MT stands for metric ton, which is a unit of mass (1 MT = 1,000 kg). Converting CBM to MT is common in shipping, logistics, warehousing, mining, agriculture, and construction.
The most important point is this: you cannot convert volume to weight without density. Two materials can have the same volume but very different weight. For example, 1 CBM of feathers and 1 CBM of sand do not weigh the same.
CBM to MT formula
To convert cubic meters to metric tons, use:
MT = (CBM × Density in kg/m³) ÷ 1000
- CBM is the total volume in cubic meters.
- Density is the material density in kilograms per cubic meter.
- Division by 1000 converts kilograms into metric tons.
Step-by-step conversion process
1) Get the volume in CBM
If needed, calculate volume first: Length × Width × Height (all in meters).
2) Find the correct density
Use a reliable density reference for your exact cargo condition (dry, wet, compacted, loose, etc.). Density changes with moisture, temperature, and packing method.
3) Apply the formula
Multiply CBM by density and divide by 1,000 to get metric tons.
Common density references (approximate)
| Material | Approx. Density (kg/m³) |
|---|---|
| Water | 1,000 |
| Diesel | 832 |
| Crude Oil | 720 |
| Cement (loose) | 1,440 |
| Dry Sand | 1,600 |
| Gravel | 1,700 |
| Wheat | 770 |
| Rice | 850 |
| Coal | 800 |
These values are for quick estimates only. For contracts, customs, or vessel loading, always use certified density data.
Worked examples
Example 1: Water shipment
Volume = 15 CBM, density = 1,000 kg/m³.
MT = (15 × 1,000) ÷ 1,000 = 15 MT
Example 2: Diesel tank
Volume = 22 CBM, density = 832 kg/m³.
MT = (22 × 832) ÷ 1,000 = 18.304 MT
Example 3: Dry sand load
Volume = 8.5 CBM, density = 1,600 kg/m³.
MT = (8.5 × 1,600) ÷ 1,000 = 13.6 MT
Why this conversion matters
- Freight planning: Weight limits affect truck, container, and vessel loading.
- Cost estimation: Many transport and storage costs are based on mass.
- Safety: Correct weight prevents overloading and stability issues.
- Inventory control: Helps reconcile stock by both volume and mass.
Common mistakes to avoid
- Using the wrong density unit (must be kg/m³ in this calculator).
- Assuming all materials with equal volume weigh the same.
- Ignoring moisture content (especially with grains, coal, and aggregates).
- Rounding too early when working with large cargo quantities.
Frequently asked questions
Can I convert CBM to MT without density?
No. Density is required because CBM measures volume while MT measures mass.
Is metric ton the same as tonne?
Yes. In most international contexts, MT and tonne both refer to 1,000 kg.
Is this calculator suitable for legal trade documents?
It is great for planning and quick estimates. For official trade documentation, use verified lab or supplier density values and follow local regulations.
Final note
Use the calculator above whenever you need a quick CBM-to-MT conversion. Just enter volume, set the correct density, and calculate. Accurate density selection is the key to accurate weight conversion.