Convert density between kilograms per cubic meter, grams per cubic centimeter and imperial density units.
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1 g/cm³ is exactly 1,000 kg/m³, and steel at 7.85 g/cm³ is about 490.05949052 lb/ft³. Petrol at about 0.74 g/mL is 740 kg/m³, while aluminium at 2.7 g/cm³ is about 0.09754369 lb/in³.
Density is mass divided by volume, and every unit converts through kilograms per cubic meter. A gram per milliliter equals a gram per cubic centimeter, because a milliliter is a cubic centimeter, so those two columns always show the same number.
Density changes with temperature and, for gases, strongly with pressure, so converting units does not adjust the physical sample. Liquid fuels expand when warm, which is why fuel is sometimes sold with temperature corrections, and the tool cannot identify a material from a density alone.
Density is mass divided by volume, and every unit here converts through kilograms per cubic meter. One gram per cubic centimeter is exactly 1,000 kg/m³, and a gram per milliliter is the same value because a milliliter is a cubic centimeter. Water at about 4 °C is close to 1 g/cm³, so densities in g/cm³ are also a quick comparison with water: petrol at about 0.74 g/mL is 740 kg/m³ and floats, while steel at 7.85 g/cm³ sinks.
Engineering tables in the United States often use pounds per cubic foot or per cubic inch. Steel at 7.85 g/cm³ is about 490.05949052 lb/ft³, and aluminium at 2.7 g/cm³ is about 0.09754369 lb/in³. Water is often quoted as 62.4 lb/ft³, which converts back to about 0.99955211 g/cm³, close to the metric value. Multiply a density by a volume to estimate mass: 1 m³ of steel at 7.85 g/cm³ weighs about 7,850 kg.
Density changes with temperature and, for gases, strongly with pressure. Air at sea level and 15 °C is about 1.225 kg/m³, which is only 0.001225 g/cm³, but that value falls at altitude and in hot weather. Liquid fuels expand when warm, which is why fuel is sometimes sold with temperature corrections. Specific gravity is density divided by the density of water and has no unit, so a specific gravity of 0.74 corresponds to about 740 kg/m³ at the reference temperature.
| Input | Result |
|---|---|
1 g/cm³ → kg/m³ | 1,000 |
0.74 g/mL → kg/m³ | 740 |
7.85 g/cm³ → lb/ft³ | 490.05949052 |
62.4 lb/ft³ → g/cm³ | 0.99955211 |
2.7 g/cm³ → lb/in³ | 0.09754369 |
1.225 kg/m³ → g/cm³ | 0.001225 |
Because water at about 4 °C is close to 1 g/cm³, a density in g/cm³ reads almost directly as a comparison with water: petrol at 0.74 g/mL floats and steel at 7.85 g/cm³ sinks. Specific gravity works the same way as density divided by the density of water, so a specific gravity of 0.74 corresponds to about 740 kg/m³ at the reference temperature.
Engineering tables in the United States often quote pounds per cubic foot or per cubic inch. Water is commonly listed as 62.4 lb/ft³, which converts back to about 0.99955211 g/cm³, close to the metric figure, so the two systems agree once converted.
Yes, by multiplying density by volume: 1 m³ of steel at 7.85 g/cm³ weighs about 7,850 kg. Take care with gases, where the value moves a great deal: air at sea level and 15 °C is about 1.225 kg/m³, only 0.001225 g/cm³, and that falls at altitude and in hot weather.