Density converter
Type a density, choose the units, and see the result and the same density in every common unit. Pound-based units use the exact international pound, foot and inch, and the US liquid gallon.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Type a number. A dot or a comma works as the decimal separator.
- Choose the unit you have and the unit you need. The ⇄ button swaps them.
- The table below shows the same density in all common units at once.
Conversion factors
Every unit is converted through kg/m³.
| Unit |
In kg/m³ |
| 1 g/cm³ |
1,000 |
| 1 g/L |
1 |
| 1 lb/ft³ |
16.01846337 |
| 1 lb/in³ |
27,679.90471 |
| 1 lb/US gal |
119.8264273 |
Worked example
Steel at about 7,850 kg/m³ is 7.85 g/cm³, or 7,850 / 16.01846 = 490.1 lb/ft³. A liquid at 0.88 g/cm³ is 880 kg/m³, or 880 / 119.826 = 7.34 lb/gal.
Quick reference
- 1 g/cm³ = 1 kg/L = 1,000 kg/m³ ≈ 62.43 lb/ft³
- 1 lb/ft³ ≈ 0.016018 g/cm³
- 1 lb/in³ ≈ 27.68 g/cm³
Frequently asked questions
How do I convert g/cm³ to kg/m³?
Multiply by 1,000. Water at about 4 °C is close to 1 g/cm³, which is about 1,000 kg/m³.
Is g/L the same as kg/m³?
Yes. One litre is 0.001 m³ and one gram is 0.001 kg, so the two numbers are identical. 1,000 g/L is 1,000 kg/m³.
How many lb/ft³ is water?
About 62.43 lb/ft³ for a density of 1,000 kg/m³. In pounds per US gallon that is about 8.35.
Which gallon does the tool use?
The US liquid gallon, 3.785411784 litres. The imperial gallon is larger (4.54609 litres), so lb/gal would be a different number.
Does density change with temperature?
Yes. Most materials expand when heated, so density drops. The converter changes units only; the density you enter should be for the temperature you care about.