maratoolHow to convert density between kg/m³, g/cm³, and lb/ft³
Type a density — read it in kg/m³, g/cm³, lb/ft³, lb/in³, or lb/gal instantly.
Material datasheets quote g/cm³, CFD and HVAC work in kg/m³, and US structural tables use lb/ft³. The Density Converter moves between them with exact factors.
How it works
- Pick units — "Gram per cubic centimeter (g/cm³)" to "Kilogram per cubic meter (kg/m³)", or any other pair.
- Type a value — the result updates as you type, with swap and copy.
- Copy — one click, with "Copied!" feedback.
Density conversion factors
Every unit converts through the kilogram per cubic meter (the base unit). To convert A → B, multiply by A's factor and divide by B's:
| Unit | = this many kilogram per cubic meters |
|---|---|
| Kilogram per cubic meter (kg/m³) | 1 |
| Gram per cubic centimeter (g/cm³) | 1,000 |
| Gram per milliliter (g/mL) | 1,000 |
| Kilogram per liter (kg/L) | 1,000 |
| Gram per liter (g/L) | 1 |
| Pound per cubic foot (lb/ft³) | 16.01846337396 |
| Pound per cubic inch (lb/in³) | 27,679.904710203125 |
| Pound per US gallon (lb/gal) | 119.826427316897 |
| Ounce per cubic inch (oz/in³) | 1,729.994044387695 |
When you need it
Handy anchors: water ≈ 1,000 kg/m³, aluminum 2.70 g/cm³ (168.6 lb/ft³), steel 7.85 g/cm³, air at sea level ≈ 1.225 kg/m³. The metric conversions are powers of ten; the pound-based ones use exact NIST mass/volume definitions.
Sources & methodology
Conversion factors follow NIST Special Publication 811; exact-by-definition factors are marked in the tool itself. All math runs client-side in your browser — nothing is uploaded.
More conversion guides
- How to convert liters to gallons, cups, and ounces
- How to convert molar mass units (g/mol, kg/mol, Da)
- How to convert square feet to square meters (and any area unit)
Or browse everything at once in the new unit & sizing converters roundup.