Density calculator: mass and volume
Pick the unknown and enter the other two values in grams and cubic centimeters. Useful in the lab and for estimating material weight.
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How to use it
- Enter what do you want to find?, mass, volume and density.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
ρ = m ÷ V, m = ρ × V, V = m ÷ ρ. Conversions: 1 g/cm³ = 1000 kg/m³ and 1000 cm³ = 1 L.
Example
Inputs: What do you want to find? = Density, Mass = 500 g, Volume = 250 cm³, Density = 2 g/cm³. Result: Density: 2 g/cm³; In kg/m³: 2,000 kg/m³.
Limits and caveats
- Density changes with temperature, especially for liquids and gases.
- Assumes a uniform material; hollow or mixed objects give an average density.
Questions about this tool
How do I find the volume of an irregular object?
Drop it into a graduated cylinder of water; the rise in milliliters is its volume in cubic centimeters.
When does an object float in water?
When its average density is lower than that of water, which is about 1 g/cm³ for fresh water.
How do I convert g/cm³ to kg/m³?
Multiply by 1000. Iron at about 7.87 g/cm³ is 7870 kg/m³.