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Mass Calculator

Mass, density, and volume are three fundamental physical properties related by a simple equation: m = ρ × V. This calculator lets you solve for any one of the three — mass, density, or volume — given the other two, and automatically converts the result into every common unit of measurement.

Mass vs Weight

Mass and weight are often used interchangeably in everyday language, but they are physically distinct. Mass (kg, g, lb) is the amount of matter in an object and does not change with location. Weight is the gravitational force acting on that mass — it would differ on the Moon versus Earth. This calculator works with mass, not force.

Common Material Densities

Knowing typical densities helps set realistic inputs. Water is 1,000 kg/m³ (1 g/cm³) — the benchmark density. Steel is roughly 7,850 kg/m³; aluminium 2,700 kg/m³; copper 8,900 kg/m³; gold 19,300 kg/m³; wood ranges from 400–900 kg/m³ depending on species; and air at sea level is about 1.225 kg/m³.

Unit Conversion Notes

When working across unit systems, be especially careful with density units. 1 g/cm³ = 1,000 kg/m³ — a factor of 1,000 that is easy to overlook. Similarly, 1 lb/ft³ ≈ 16.02 kg/m³. The calculator handles all these conversions automatically regardless of which input units you choose.

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Mass is the product of density and volume. This calculator solves for any one of the three variables given the other two.

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⚖️Mass Calculator

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