Density Calculator
Calculate density, mass, or volume using ρ = m / V. Enter any two values to solve for the third.
Enter any two values to solve for the third.
Enter two values to calculate the third.
Density Formula
ρ = m / V
m = ρ × V
V = m / ρ
m = ρ × V
V = m / ρ
Density (ρ, rho) is mass per unit volume. Objects with density less than a fluid will float in it.
Example: A block with mass 500 g and volume 200 cm³.
ρ = 0.5 kg / 0.0002 m³ = 2500 kg/m³ (or 2.5 g/cm³)
ρ = 0.5 kg / 0.0002 m³ = 2500 kg/m³ (or 2.5 g/cm³)
Common Densities
| Material | Density (kg/m³) |
|---|---|
| Air (sea level) | 1.225 |
| Water | 1,000 |
| Aluminum | 2,700 |
| Iron | 7,874 |
| Gold | 19,300 |
| Mercury | 13,534 |
FAQ
Why do objects float or sink?
An object floats if its density is less than the fluid it's in. Ice (917 kg/m³) floats in water (1000 kg/m³) because it's less dense.
How do I convert g/cm³ to kg/m³?
Multiply by 1000. For example, 2.7 g/cm³ = 2700 kg/m³.
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Last updated: 2026-08-08