Density Converter
Convert density between kg/m³, g/cm³, lb/ft³ and more.
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Step by step
The formula
result = value × (factorₓ / factorᵧ)
Density is mass packed into a volume, which is why it decides whether something floats. Water sits at exactly 1,000 kg/m³ by design — the kilogram was originally defined as the mass of a litre of water, so the metric system has this relationship built in.
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Common questions this calculator answers — select one to load its values.
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Frequently asked questions
What is the density of water?+
Fresh water is almost exactly 1,000 kg/m³, which is the same as 1 g/cm³ or 1 kg/L — the metric system was designed around it.
Why do engineers use lb/ft³?+
It is the customary unit in US construction and HVAC work. Concrete is roughly 150 lb/ft³ and structural steel about 490 lb/ft³.
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