Calculate the mass of an object from its density and volume, or from its weight and gravity.
Mass = density × volume, or mass = weight ÷ gravity. Ten litres of steel (7,850 kg/m³) has a mass of 78.5 kg; a weight of 980.665 N on Earth is exactly 100 kg.
Mass is the amount of matter in an object and, unlike weight, it does not change with location. This calculator finds mass two ways: from density and volume (using presets for materials such as steel, water and gold, or your own density), and from weight (force) and the local gravitational acceleration on Earth, the Moon, Mars, Jupiter or a custom value.
Results are shown in kilograms, grams, pounds, ounces, tonnes and stone. Use the Density Calculator to find density from mass and volume, or the Weight Calculator to see weight on other planets.
Two standard relationships are used.
| Calculation | Mass |
|---|---|
| 10 litres of steel | 78.5 kg |
| 1 m³ of water | 998 kg |
| 1 ft³ of aluminum | 76.455486 kg |
| 980.665 N weighed on Earth | 100 kg |
| 162 N weighed on the Moon | 100 kg |
Densities are typical values at room temperature and vary with composition, temperature and porosity.
| Material | Density (kg/m³) | Density (g/cm³) |
|---|---|---|
| Air (15 °C) | 1.225 | 0.001225 |
| Ice | 917 | 0.917 |
| Water (20 °C) | 998 | 0.998 |
| Oak wood (approx.) | 750 | 0.75 |
| Concrete | 2,400 | 2.4 |
| Glass | 2,500 | 2.5 |
| Aluminum | 2,700 | 2.7 |
| Steel | 7,850 | 7.85 |
| Iron | 7,874 | 7.874 |
| Copper | 8,960 | 8.96 |
| Silver | 10,490 | 10.49 |
| Lead | 11,340 | 11.34 |
| Mercury | 13,534 | 13.534 |
| Gold | 19,320 | 19.32 |
Mass (kilograms) measures how much matter an object contains. Weight is the force gravity exerts on that mass (newtons). A person with a mass of 70 kg has the same mass on the Moon, but weighs about one-sixth as much. A bathroom scale measures weight but is calibrated to display mass on Earth.
Multiply density by volume, or divide weight (force) by the acceleration due to gravity.
m = ρ × V (mass = density × volume) or m = F ÷ g (mass = weight ÷ gravity).
Mass is the amount of matter (kg) and is constant. Weight is the gravitational force on that mass (N) and changes with gravity.
Divide by 9.80665 on Earth. 980.665 N is 100 kg.
About 1 kg (998 g at 20 °C).
Calculate its volume (length × width × height), choose the metal's density and multiply.
1 kg is 2.20462 lb.
The kilogram (kg).
Mass depends on the amount of matter, not on gravity, so only weight changes.
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