CBM to KG (Cubic Meters to Kilograms)
Convert CBM to KG using the sea-freight convention of 1 m³ = 1,000 kg. For air freight, 1 m³ ≈ 167 kg.
The quick answer
One cubic meter is billed as 1,000 kg on ocean freight, and that is the ratio this converter applies. Air freight puts the switch near 167 kg per cubic meter, express near 200 kg. None of those figures is what your cargo weighs, so weigh the shipment too.
- The heavier side wins — a 6 CBM load at 4,000 kg bills as 6 revenue tons.
- Why it is 1,000 — fresh water weighs about 1,000 kg per cubic meter. That sets the line.
- Light loads pay for space — under 1,000 kg per cubic meter, the bill follows volume.
- Which figure will you be billed on? Compare weight against volume in the chargeable weight calculator.
1 m³ = 1,000 kg
kilograms (kg)
This uses the ocean/LCL revenue-ton ratio (1 m³ = 1,000 kg). Air freight uses 1 m³ ≈ 167 kg (the 6,000 cm³/kg factor). It is a billing convention, not the actual weight of your goods.
Quick reference
How to convert cubic meters to kilograms
To convert cubic meters to kilograms, multiply by the conversion factor:
In freight, this conversion comes up whenever your paperwork, carrier, or marketplace quotes volume or weight in different units than you measured. Getting it right keeps your chargeable weight consistent across every quote.
One conversion, three different ratios — pick by mode
There is no physical CBM-to-KG conversion — a cubic meter of pillows and a cubic meter of tiles weigh wildly different amounts. What carriers use instead are billing equivalences, and they differ by mode: ocean LCL treats 1 CBM as equivalent to 1,000 kg, air freight (IATA convention, 6,000 cm³ per kg) treats 1 CBM as about 167 kg, and express couriers using the 5,000 divisor treat it as 200 kg.
Budgeting with the wrong ratio is the classic error. A 2 CBM shipment is "2,000 kg" to an ocean tariff but "334 kg" to an air tariff — quote requests that mix these up come back with prices that make no sense.
How weight-or-measure billing actually works
Ocean LCL is charged per revenue ton: the greater of your cargo's weight in metric tons or its volume in CBM. Light cargo of 3 CBM weighing 1.2 t bills as 3 revenue tons (volume wins); dense cargo of 2 CBM weighing 3.5 t bills as 3.5 (weight wins). The break-even is exactly the 1,000 kg/m³ convention this page converts with.
Air freight runs the same contest at a different ratio. A 1.2 CBM consignment has a volumetric weight of 1,200,000 cm³ ÷ 6,000 = 200 kg; if it actually weighs 150 kg, you're billed on 200. Anything lighter than about 167 kg per cubic meter pays for space, not mass.
Frequently asked questions
How do you convert cubic meters to kilograms?
Multiply the number of cubic meters by 1,000 to get kilograms. For example, 10 m³ = 10,000 kg.
How many kilograms are in one cubic meter?
One m³ equals 1,000 kg. This uses the ocean/LCL revenue-ton ratio (1 m³ = 1,000 kg). Air freight uses 1 m³ ≈ 167 kg (the 6,000 cm³/kg factor). It is a billing convention, not the actual weight of your goods.
Is cbm to kg the same conversion?
Yes — cbm to kg, 1 cbm to kg, cbm to kg shipping all refer to converting cubic meters to kilograms. The calculator above handles it instantly.
Is 1 CBM always 1,000 kg?
No — 1 CBM = 1,000 kg is only the ocean-freight billing equivalence (fresh water happens to have the same density, which is where the convention comes from). Your cargo's real weight depends entirely on what it is; weigh it for documentation and let the tariff compare weight against volume.
How many kg is 1 CBM in air freight?
About 167 kg, from the IATA volumetric convention of 6,000 cm³ per kg (1,000,000 ÷ 6,000 = 166.7). Express couriers often use a 5,000 divisor instead, which makes 1 CBM equal 200 kg of chargeable weight.