Density Converter
Convert density between kg/m³, g/cm³, g/mL, kg/L and lb/ft³, lb/in³, lb/gal, oz/in³, oz/gal and slug/ft³ — all at once.
kg/m³
1,000
g/cm³
1
g/mL
1
kg/L
1
lb/ft³
62.427961
lb/in³
0.03612729
lb/gal (US)
8.3454045
oz/in³
0.57803667
oz/gal (US)
133.52647
slug/ft³
1.9403203
How to use
- Type a density value.
- Pick the unit you entered it in.
- Read the value in every other unit and copy whichever you need.
About this tool
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Enter a density (mass per volume) in any common unit and see it in all the others instantly: kilogram per cubic metre (kg/m³), gram per cubic centimetre (g/cm³), gram per millilitre (g/mL), kilogram per litre (kg/L), pound per cubic foot (lb/ft³), pound per cubic inch (lb/in³), pound per US gallon (lb/gal), ounce per cubic inch (oz/in³), ounce per US gallon (oz/gal) and slug per cubic foot (slug/ft³). The value is converted to kg/m³ internally and then to every unit, so conversions are exact — the imperial factors are derived from 1 lb = 0.45359237 kg and 1 inch = 0.0254 m. Density is mass ÷ volume, so it ties together the Weight and Volume converters. Handy for materials and metals (lb/ft³, kg/m³), chemistry and cooking (g/cm³, g/mL) and engineering (slug/ft³). Everything is computed locally in your browser.
Frequently asked questions
Why do g/cm³, g/mL and kg/L all show the same number?
Because they are the same size: 1 g/cm³ = 1 g/mL = 1 kg/L = 1000 kg/m³ exactly. A millilitre is a cubic centimetre, and a litre is 1000 of them, so these three units are just different spellings of the same density. Water is about 1 g/cm³.
What is the density of water?
Pure water at 4 °C is very close to 1000 kg/m³ = 1 g/cm³ = 62.428 lb/ft³ = 8.345 lb/gal (US). It drops slightly at higher temperatures, which is why hot water floats on cold.
How do I convert g/cm³ to kg/m³?
Multiply by 1000: 1 g/cm³ = 1000 kg/m³, so steel at 7.85 g/cm³ is 7850 kg/m³. To go back, divide by 1000. This tool does it both ways along with the imperial units.
What is a slug per cubic foot?
The slug is the imperial unit of mass (1 slug ≈ 14.594 kg), used with pounds-force in engineering. 1 slug/ft³ ≈ 515.38 kg/m³. It appears in fluid dynamics where mass must be distinguished from weight.
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