Mass to Density Calculator — Density, Mass & Volume
Solve the density triangle: enter any two of density, mass and volume to find the third. Supports multiple units — grams, kilograms, pounds, cm³, litres, cubic metres and more.
Solve for
Mass unit
Volume unit
Mass per unit volume in kilograms per cubic metre
ρ = m / V
- 1
Convert mass to kg
500 g × 0.001 = 0.5 - 2
Convert volume to m³
250 cm3 × 0.000001 = 0.00025 - 3
Density ρ = m ÷ V
0.5 ÷ 0.00025 = 2,000
How does this calculator work?
Density = Mass ÷ Volume (ρ = m/V). Rearrange to find mass (m = ρV) or volume (V = m/ρ). All inputs are converted to kg and m³ before computing. Water is 1000 kg/m³; aluminium ≈ 2700; iron ≈ 7874; gold ≈ 19 300. Results are shown in kg/m³ and g/cm³.
Formula
How this is calculated
Density (ρ, rho) is defined as mass per unit volume: ρ = m ÷ V. The SI unit is kg/m³, but g/cm³ is common in chemistry and materials science — where 1 g/cm³ = 1000 kg/m³ and is numerically equal to specific gravity relative to water at 4 °C (where water's density is exactly 1 g/cm³). Rearranging the formula gives mass = ρ × V and volume = m ÷ ρ, allowing any one of the three variables to be solved when the other two are known.
The calculator converts all inputs to the SI base units (kilograms and cubic metres) before computing, then expresses the result in the most readable unit. For example, entering 500 g and 250 cm³ converts to 0.0005 kg and 0.00000025 m³, yielding 2000 kg/m³ — the same as 2 g/cm³, roughly the density of concrete.
Common reference values (all approximate): water ≈ 1000 kg/m³, aluminium ≈ 2700 kg/m³, iron ≈ 7874 kg/m³, gold ≈ 19 300 kg/m³, air at sea level ≈ 1.2 kg/m³, balsa wood ≈ 120 kg/m³. These figures are for reference at standard temperature and pressure; density varies with temperature, pressure, and material purity.
Frequently asked questions
Density = Mass ÷ Volume (ρ = m ÷ V). In SI units, density is expressed in kg/m³ or the equivalent g/cm³ (1 g/cm³ = 1000 kg/m³). Rearranging gives mass = ρ × V and volume = m ÷ ρ.
Liquid water at 4 °C has a density of exactly 1000 kg/m³ (1 g/cm³ or 1 kg/L). At room temperature (20 °C) it is approximately 998 kg/m³. This is used as the reference for specific gravity — a substance with specific gravity 2.7 has a density of 2700 kg/m³.
Density determines whether objects float or sink, how materials are layered in mixtures (oil floats on water because it is less dense), the structural efficiency of engineering materials, and how to compare substances by mass when only volume is measured (e.g., buying gold, soil or aggregate by weight after measuring a volume).
Also known as
TG we-Calculate Editorial Team. (2026). Mass to Density Calculator — Density, Mass & Volume [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/mass-to-density-calculator
TG we-Calculate Editorial Team. "Mass to Density Calculator — Density, Mass & Volume." TG we-Calculate. 2026. https://we-calculate.com/calculator/mass-to-density-calculator.
TG we-Calculate Editorial Team, "Mass to Density Calculator — Density, Mass & Volume," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/mass-to-density-calculator
@misc{wecalculate_mass_to_density_calculator, title = {Mass to Density Calculator — Density, Mass & Volume}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/mass-to-density-calculator}}, year = {2026}, note = {TG we-Calculate} }
Did this calculator help you?