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- Finds density, mass or volume when you know the other two.
- Works with g, kg, lb, oz and cm³, mL, L, m³, in³, ft³ and gallons.
- Shows density in g/cm³, kg/m³, lb/ft³ and lb/gal.
- Tells you whether the object floats or sinks in water.
How to use the density calculator
Choose what to find
Density, mass or volume.
Enter the two known values
For example a mass of 500 g and a volume of 200 cm³.
Pick the units
For mass, volume and density.
Read the result
With conversions to other units.
The density formula
Density tells you how much mass is packed into a given volume. Dense materials such as gold feel heavy for their size, while low-density materials such as wood or oil float on water.
Density formulas
Density ρ = mass ÷ volume
Mass = density × volume
Volume = mass ÷ density
Example 1: finding density
500 g with a volume of 200 cm³.
- Density 2.5 g/cm³ = 2,500 kg/m³
- In imperial units 156.07 lb/ft³
- In water Sinks (denser than 1 g/cm³)
Example 2: mass of 2 liters of oil
Density 0.92 g/cm³.
- Mass 1.84 kg
Example 3: volume of 1 kg of gold
Density 19.32 g/cm³.
- Volume 51.76 cm³
Where density is used
Science class
Solve density, mass and volume problems.
Identifying materials
Compare a measured density with known values.
Shipping
Work out freight density.
Cooking and brewing
Convert between weight and volume.
Find the volume of a shape with the volume calculator, or prepare solutions with the molarity calculator.
Density calculator FAQ
What is the formula for density?
Density = mass ÷ volume.
What is the density of water?
About 1 g/cm³, or 1,000 kg/m³.
How do I find mass from density?
Multiply density by volume. 0.92 g/cm³ × 2,000 cm³ = 1,840 g.
Why do some things float?
Objects less dense than water float; denser objects sink.
What is specific gravity?
The density of a material divided by the density of water. It has no units.
What units is density measured in?
Commonly g/cm³, kg/m³ or lb/ft³.