Density Converter
Convert density between kg/m³, g/cm³, g/mL, kg/L, lb/ft³ and lb/in³ instantly, with both-way results and a reference table.
About the Density Converter
This density converter switches between the mass-per-volume units used in science, engineering and industry: kilograms per cubic metre, grams per cubic centimetre, grams per millilitre, kilograms per litre, pounds per cubic foot, pounds per cubic inch and pounds per US gallon. Enter a value and get the answer instantly.
Density tells you how much mass is packed into a given volume — water is about 1000 kg/m³ (1 g/cm³), aluminium about 2700 kg/m³ and lead about 11,340 kg/m³. Note that g/cm³, g/mL and kg/L are numerically identical, a handy shortcut when reading material datasheets.
All conversions use exact factors through a kg/m³ base unit and run locally in your browser, giving fast, precise results for physics homework, material selection and fluid calculations.
How to Use the Density Converter
- 1Enter the density value to convert.
- 2Select the unit you have and the unit you want.
- 3Read the result and the reverse conversion instantly.
- 4Check the reference table for common values.
Frequently Asked Questions
What is the density of water?
Pure water at 4 °C is 1000 kg/m³, which equals 1 g/cm³, 1 g/mL and 1 kg/L. This makes water a convenient reference: any substance denser than 1 g/cm³ sinks in water, and anything lighter floats. Density drops slightly as water warms.
Are g/cm³, g/mL and kg/L the same?
Numerically, yes — all three give the same number for a given density, because 1 cm³ = 1 mL and the unit ratios cancel out. So 2.7 g/cm³ is 2.7 g/mL and 2.7 kg/L. They're just different ways of writing the same quantity, which is why they sit together in this converter.
How do I convert kg/m³ to g/cm³?
Divide by 1000: 1 g/cm³ equals 1000 kg/m³. So steel at 7850 kg/m³ is 7.85 g/cm³. Going the other way, multiply g/cm³ by 1000 to get kg/m³. This tool does the factor for you in both directions.
Why do engineers use lb/ft³?
Pounds per cubic foot is common in US construction and HVAC — concrete is around 150 lb/ft³ and air about 0.075 lb/ft³. It converts to about 16.018 kg/m³ per lb/ft³. This converter includes it alongside metric units so you can move between US and SI datasheets.
Does temperature affect density?
Yes. Most materials expand when heated, lowering their density, and gases are especially sensitive to both temperature and pressure. Published density figures usually specify a reference temperature. This converter does pure unit conversion, so use the density value that matches your conditions.