How to Convert Density Units (2026)

Density — mass per unit volume — is expressed in different units depending on whether you are working in science, engineering, food production, or industry. The Density Converter converts between kg/m³, g/cm³, g/mL, g/L, lb/ft³, lb/in³, lb/gal, and oz/ft³ simultaneously when you enter any single value.

How to Convert Density Units

1. Open the Density Converter.
2. Click the unit card for your source unit to make it the active input.
3. Enter your density value. All other units update instantly.
4. Copy any result using the Copy button on the target unit card.
5. Switch input unit by clicking a different card — results recalculate from the new value.

Common Density Conversion Reference

The base SI unit for density is kg/m³. All other units derive from it. The most frequent practical conversion is between kg/m³ and g/cm³ — they differ by a factor of 1,000 and are both standard in scientific literature.

Real-World Density Reference Points

Water at 4°C is exactly 1 g/cm³ (1,000 kg/m³) — a useful anchor for estimating whether a material floats or sinks. Air at sea level is about 1.225 kg/m³ (1.225 g/L). Concrete runs 2,000–2,500 kg/m³ depending on mix. Aluminium is around 2,700 kg/m³; steel is 7,850–8,050 kg/m³; lead is 11,340 kg/m³. For liquids, engine oil is typically 850–900 kg/m³, petrol (gasoline) is 720–775 kg/m³, and milk is approximately 1,030 kg/m³. Knowing these baselines lets you sanity-check a converted value — if a calculated density for a liquid comes out near 1,000 kg/m³, it is water-like, which is often correct.

Use the Density Converter to do this instantly.