Density Calculator
Solve for density, mass or volume in g/mL, kg/m³ or lb/ft³, with common material densities.
Density = mass ÷ volume. 250 g of a liquid filling 200 mL has a density of 250 ÷ 200 = 1.25 g/mL, which is 1,250 kg/m³ and denser than water, so it sinks.
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How to use it
- Choose whether to solve for density, mass or volume.
- Enter the other two values and pick their units, or tap a material for its density.
- Read the answer in metric and US units.
What you enter
- Two of mass, volume and density
What you get
- Density (g/mL, kg/m³, lb/ft³)
- Mass
- Volume
Formula
ρ = m / V
Worked example: ethanol
Input: Density 0.789 g/mL, volume 200 mL
Result: Mass 157.8 g
Ethanol is lighter than the same volume of water (200 g).
Questions
What is the formula for density?
ρ = m ÷ V. Rearranged, mass = density × volume and volume = mass ÷ density.
What units is density in?
Lab work uses g/mL or g/cm³ (the same), engineering uses kg/m³ (1 g/mL = 1,000 kg/m³) and US practice often uses lb/ft³ (1 g/mL = 62.43 lb/ft³).
How do I find the density of an irregular object?
Weigh it, then lower it into a graduated cylinder of water; the rise in water level is its volume. Divide mass by that volume.
Will it float?
An object floats in water if its average density is below 1.0 g/mL (about 1.025 in seawater).
Limitations
- Density changes with temperature, especially for gases and liquids.
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All free tools · By Dr. Zubair Khalid, DVM, MS, PhD.