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. Choose the units to convert from and to.
  2. Enter a value — the converted result updates instantly.
  3. Click Copy to copy the result to your clipboard.

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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