Density Calculator
Solve density, mass or volume from the other two, in any units.
About Density Calculator
Density is mass per unit volume: ρ = m / V. Water has a density of 1 g/cm³ (= 1000 kg/m³) at 4 °C — this is the reference for specific gravity. Materials denser than water (ρ > 1 g/cm³) sink; those lighter float. The calculator converts between common metric and US customary units before and after the calculation.
Formula
Density
Density = Mass ÷ Volume
- ρ
- Density (kg/m³ or g/cm³)
- m
- Mass (kg or g)
- V
- Volume (m³ or cm³)
Worked example
With the default values below, Density Calculator returns Result of 1,000.000000. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Solve Forone of Density (ρ), Mass (m), Volume (V)
- Density (ρ)
- Massminimum 0
- 1,000
- Mass Unitone of kg, g, mg, lb, oz, t
- kg
- Volumeminimum 0
- 1
- Volume Unitone of m³, cm³, mm³, L, mL, ft³, in³, gal
- m³
- Densityminimum 0
- 1,000
- Density Unitone of kg/m³, g/cm³, g/L, kg/L, lb/ft³, lb/in³
- kg/m³
- Output Density Unitone of kg/m³, g/cm³, g/L, kg/L, lb/ft³, lb/in³
- kg/m³
- Output Mass Unitone of kg, g, mg, lb, oz, t
- kg
- Output Volume Unitone of m³, cm³, mm³, L, mL, ft³, in³, gal
- m³
Results
- Result
- 1,000.000000
- Density (g/cm³)
- 1.000000
- Density (kg/m³)
- 1,000.0000
Step by step
- 1Mass in kg= 1000 kg
- 2Volume in m³= 1 m³
- 3Density = mass ÷ volume= 1000 kg/m³ = 1 g/cm³
Assumptions and limits
- The result is derived only from the 10 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 9 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
What is the density of water?
Pure water at 4 °C has a density of exactly 1 g/cm³ (1000 kg/m³). At 25 °C it is slightly less, 0.997 g/cm³. Sea water is denser at about 1.025 g/cm³.
What is specific gravity?
Specific gravity is the ratio of a substance's density to the density of water. Because water is 1 g/cm³, specific gravity and density in g/cm³ are numerically equal. Steel (specific gravity ≈ 7.8) is 7.8× denser than water.
My object has irregular shape — how do I find its volume?
Use the water displacement method: fill a graduated cylinder with a known volume of water, submerge the object, and read the new level. The difference is the object's volume. Then density = mass / displaced volume.
How do I convert kg/m³ to g/cm³?
Divide by 1000. 1000 kg/m³ = 1 g/cm³. This is because 1 m³ = 1,000,000 cm³ and 1 kg = 1000 g, so the ratio is 1000.