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Free online density converter

Density measures how much mass is packed into a given volume. This converter handles 10 common density units used in science, engineering, and everyday measurement.

About this calculator

How to use

  1. Enter the density value.
  2. Select the unit you are converting from.
  3. Select the unit you are converting to.
  4. The result and full conversion table appear instantly.
  5. Click “Share with my numbers” to copy a URL with your inputs.

Conversion factors (relative to kg/m³)

Unitkg/m³ equivalent
kg/m³1
g/cm³1 000
g/L1
kg/L1 000
lb/ft³16.0185
lb/in³27 679.9
lb/gal (US)119.826
oz/ft³1.00115
t/m³1 000
slug/ft³515.379

Worked example

Water at 4 °C has a density of 1 g/cm³.

Converting to kg/m³: 1 × 1 000 = 1 000 kg/m³

Converting to lb/ft³: 1 000 ÷ 16.0185 ≈ 62.43 lb/ft³

Notes

  • g/cm³ and g/mL are equivalent units (1 cm³ = 1 mL).
  • g/L and kg/m³ are also equivalent — both equal 1 in the base conversion.
  • Conversion factors follow NIST Guide to the SI (2008), Appendix B.

Frequently asked

How does the density converter work?
Every unit is first converted to the base unit (kg/m³) by multiplying by a fixed factor, then divided by the target unit's factor to get the result.
What is the density of water?
Pure water at 4 °C has a density of 1 g/cm³, which equals 1000 kg/m³ or 1 kg/L.
What is g/cm³ in kg/m³?
1 g/cm³ = 1000 kg/m³. To convert, multiply g/cm³ by 1000.
What is a slug per cubic foot?
The slug is a unit of mass in the imperial system. One slug per cubic foot equals approximately 515.379 kg/m³.
What units are supported?
kg/m³, g/cm³ (= g/mL), g/L, kg/L, lb/ft³, lb/in³, lb/gal (US), oz/ft³, t/m³, and slug/ft³.

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