Density Converter — kg/m³, g/cm³ & lb/ft³

Convert between kg/m³, g/cm³, g/mL, lb/ft³, and lb/in³ using exact NIST-derived factors.

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How this conversion works. Every unit is converted through kg/m³ (SI) with factors derived exactly from NIST mass and volume definitions in NIST Special Publication 811.

How to use

  1. Pick the unit you are converting from, such as Kilogram per cubic meter (kg/m³) or Gram per cubic centimeter (g/cm³).
  2. Type the value and every other unit updates as you type.
  3. Copy the figure you need, or use the swap button to reverse the direction, Ounce per cubic inch (oz/in³) included.

Frequently asked questions

How do I convert gram per cubic centimeter to kilogram per cubic meter?

1 gram per cubic centimeter = 1000 kilogram per cubic meter. Choose "Gram per cubic centimeter (g/cm³)" as From and "Kilogram per cubic meter (kg/m³)" as To, type a value, and the result updates instantly.

What is the density of water in these units?

At 4 °C water is about 1 g/cm³ = 1,000 kg/m³ = 62.43 lb/ft³ = 8.345 lb/gal. Most quick calculations use exactly 1,000 kg/m³.

Are g/mL and g/cm³ the same?

Yes — since 1965 the liter is defined as exactly 1 dm³, so 1 mL = 1 cm³ and the two density units are identical.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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