CalcVind

Density Calculator

Density, mass or volume from the other two

What You Know

Density

7,850 kg/m³Density
7.85In g/cm³
490.06
lb/ft³
7.85
Specific gravity
Sink
In water it would
Steel
Close to

Typical densities

Materialkg/m³g/cm³
Air1.20.0012
Petrol720–775 (BS-VI, 15 °C)0.745
Diesel820–860 (BS-VI, 15 °C)0.84
Ice9170.917
Cooking oil9200.92
Water1,0001
Sea water1,0251.025
Milk1,0301.03
Cement1,4401.44
Sand (dry)1,500–1,7001.6
  1. 1
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    Density, mass or volume
  2. 2
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    In any units
  3. 3
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    With specific gravity

What is the density formula?

Density is mass per unit volume. Rearranging the same formula gives mass or volume.

Density ρ = mass ÷ volume

Mass = density × volume · Volume = mass ÷ density

1 g/cm³ = 1 kg/L = 1,000 kg/m³

Weight of petrol and diesel

Fuel is sold by volume. Under the BS-VI standard, petrol's density at 15 °C must be 720–775 kg/m³, so a litre weighs about 0.72–0.775 kg, and diesel 820–860 kg/m³, about 0.82–0.86 kg a litre. Pumps display the day's density; fuel expands slightly when warm.

Specific gravity

Specific gravity is density compared with water (1,000 kg/m³). Below 1, an object floats; above 1, it sinks. Ice at 0.917 floats with about 92% of it under water.

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Frequently asked questions

What is the density of water?

About 1,000 kg/m³, or 1 g/cm³, which is why 1 litre of water weighs about 1 kg. It's highest at 4 °C.

How much does 1 litre of petrol weigh?

About 0.74–0.75 kg on average; BS-VI petrol must be 720–775 kg/m³ at 15 °C.

How do I convert g/cm³ to kg/m³?

Multiply by 1,000. Steel at 7.85 g/cm³ is 7,850 kg/m³.

Last reviewed: October 2026