Density Calculator

Density equals mass divided by volume (d = m / V). Rearranged, mass = density x volume and volume = mass / density. The calculator applies whichever form matches the value you asked it to solve for.

You pick the mass unit (kg, g, mg or lb) and the volume unit (m3, cm3, L or mL). Density is displayed in that exact pair, for example g/cm3, and also converted to SI kg/m3 for reference.

Internally every value is converted to SI base units (kilograms and cubic metres), the missing quantity is solved, then the answer is converted back to the units you selected. That lets you combine grams with cubic centimetres or pounds with litres without doing the maths by hand.

They differ by a factor of 1000, so 1 g/cm3 equals 1000 kg/m3. Water is close to 1 g/cm3, which is 1000 kg/m3 or 1 kilogram per litre. The tool shows both figures side by side.

Pure water near 4 C is about 1 g/cm3, equal to 1000 kg/m3 or 1 kg per litre. Enter 1 kg and 1 L and solve for density to reproduce that value.

Density divides mass by volume, so a volume of zero would be a division by zero. When you solve for density or mass with a volume of zero the calculator reports that volume must be greater than zero.

This is a pure arithmetic tool, so it uses the numbers you enter and does not adjust for temperature or pressure. Real densities shift as materials expand or contract, so measure mass and volume at the same conditions for an accurate result.

Answers are rounded to nine decimal places, which is far finer than most laboratory measurements. If a value looks slightly off in the last digits, that is floating point rounding rather than a formula error.

No. The calculation runs entirely in your browser with JavaScript, so the mass and volume figures you type never leave your device.