Density Converter
Convert density units instantly — kg/m³, g/cm³, kg/l, g/l, lb/ft³, and lb/in³. Enter a density value, select your unit, and see all conversions at once.
0.001
g/cm³
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How to Use the Density Converter
Type the density value in the Value field and select the unit you are converting from. All other unit equivalents appear instantly.
Density Units Explained
Density is mass per unit volume: ρ = m / V. The SI unit is kg/m³.
- kg/m³ — SI unit. Water ≈ 1,000 kg/m³; iron ≈ 7,874 kg/m³.
- g/cm³ — numerically equal to g/ml. Very common in chemistry. Water = 1.000 g/cm³.
- g/l — equals kg/m³ numerically. Convenient for liquids: water = 1,000 g/l. Wait — actually g/l = kg/m³ only when comparing: 1 g/l = 1 kg/m³. Correct.
- kg/l — 1 kg/l = 1,000 kg/m³. Used for dense liquids like mercury (13.53 kg/l).
- mg/ml — equals g/l = kg/m³. Used in medicine and chemistry.
- lb/ft³ — 16.018 kg/m³. Common in US engineering. Water ≈ 62.43 lb/ft³.
- lb/in³ — 27,680 kg/m³. Used for metals and dense materials.
Common Material Densities
Water: 1,000 kg/m³ | Air: 1.2 kg/m³ | Aluminum: 2,700 kg/m³ | Steel: ~7,850 kg/m³ | Gold: 19,300 kg/m³
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Worked Examples
Aluminum: 2.7 g/cm³ to kg/m³
2.7 × 1,000 = 2,700 kg/m³. Aluminum is about 2.7 times denser than water.
Steel: 7,850 kg/m³ to lb/ft³
7,850 ÷ 16.01846 = 490 lb/ft³. Structural steel is about 490 lb/ft³.
Gasoline: 0.74 kg/l to lb/ft³
0.74 kg/l = 740 kg/m³ ÷ 16.01846 = 46.2 lb/ft³.
Mercury: 13.53 g/cm³ to kg/m³
13.53 × 1,000 = 13,530 kg/m³. Mercury is 13.5 times denser than water.
Frequently Asked Questions
What is the density of water in different units?
Water at 4°C: 1,000 kg/m³ = 1 g/cm³ = 1 g/ml = 1 kg/l = 62.428 lb/ft³ = 0.03613 lb/in³.
How do I convert g/cm³ to kg/m³?
Multiply by 1,000. 1 g/cm³ = 1,000 g per 1,000 cm³ = 1,000 g/l = 1,000 kg/m³.
Why are some materials listed as denser than water?
Objects denser than water (density > 1 g/cm³) sink, while objects less dense than water float. Steel at 7.85 g/cm³ sinks; wood at ~0.5 g/cm³ floats.