Density Calculator
Find density from mass and volume, or the mass or volume from a known density, in grams, kilograms, pounds, milliliters, liters, cubic feet or gallons.
Density is mass divided by volume. A lead cube with a mass of 90.7 g and a volume of 8 cm³ has a density of 90.7 / 8 = 11.34 g/cm³, which is 11,340 kg/m³ or 707.8 lb/ft³. Rearranged, mass is density times volume, and volume is mass divided by density.
This calculator is for learning and for estimates, and it is not a substitute for a measured value from a supplier or a data sheet. Real densities change with temperature, pressure and purity, and the reference figures quoted here are rounded textbook values.
Density
11.34 g/cm³
- Density
- 11.34 g/cm³ = 11,340 kg/m³ = 707.8 lb/ft³
- Mass
- 90.7 g = 0.2 lb
- Volume
- 8 cm³ (mL) = 0.008 L
Shown to 4 significant figures. A cubic centimeter is the same as a milliliter.
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About the Density Calculator
Density says how much mass is packed into a given volume, so it explains why a pound of feathers fills far more space than a pound of lead. It is the mass divided by the volume. The SI unit is the kilogram per cubic meter, while chemistry usually quotes grams per cubic centimeter for solids and liquids and grams per liter for gases. A cubic centimeter is the same as a milliliter, so g/cm³ and g/mL are the same number. The calculator mixes the listed units freely and converts them with exact definitions, such as 1 lb = 0.45359237 kg and a US gallon of 231 cubic inches. The default example is the lead cube from OpenStax Chemistry: 2.00 cm on an edge, so 8.00 cm³, with a mass of 90.7 g. That is 11.34 g/cm³ to four figures, which the textbook rounds to 11.3 to match its three-figure data. Switch to Mass or Volume to run it the other way, for example to find what a container of a known liquid weighs.
Frequently asked questions
What is the density formula?+
Density = mass / volume. Rearranged, mass = density x volume and volume = mass / density. Keep the units consistent, or let the calculator convert them: grams and cubic centimeters give g/cm³, kilograms and cubic meters give kg/m³.
What is the density of water?+
About 1.0 g/cm³, or 1,000 kg/m³, at room temperature, so a US gallon of water has a mass of about 3.785 kg, or 8.345 lb. Ice is less dense, about 0.92 g/cm³, which is why it floats.
How do I find the volume of an object from its mass?+
Divide the mass by the density of the material. Gold is about 19.3 g/cm³, so 1 kg of gold takes up 1,000 / 19.3 = 51.81 cm³, about the size of a cube 3.73 cm on each side.
How do I measure the volume of an irregular object?+
Use displacement: note the water level in a graduated cylinder, drop the object in, and read the new level. The rise is the object's volume. OpenStax uses this for a piece of iron of 31.48 g that raised the water by 4.0 mL, a density of 7.9 g/mL.
Density as mass divided by volume, the units, the reference densities and the lead cube and iron examples: OpenStax, Chemistry 2e, section 1.4, Measurements. Unit conversions use exact definitions: 1 lb = 0.45359237 kg, 1 in = 0.0254 m and 1 US gallon = 231 cubic inches.
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