Math
Density Calculator
Solve density, mass, or volume from the other two. Supports g, kg, lb, oz, mL, L, cm^3, m^3, in^3, ft^3, gal, and fl oz with unit-safe math.
Density Calculator
Given mass and volume, find the density.
Must be greater than zero.
Must be greater than zero. 1 mL equals 1 cm³.
Pick the unit you want the answer in.
Density
1 g/cm³
This is within 5 percent of the density of pure water (1 g/cm³).
Mass
100 g
Volume
100 mL
Density
1 g/cm³
Density in common units
g/cm³
1
kg/m³
1,000
lb/ft³
62.428
Reference: common substance densities
- Water (4 °C)1 g/cm³
- Ice (0 °C)0.917 g/cm³
- Aluminum2.7 g/cm³
- Steel7.85 g/cm³
- Lead11.34 g/cm³
Values are approximate, at standard room temperature and pressure.
Frequently Asked Questions about the Density Calculator
What is the formula for density?
Density equals mass divided by volume: rho = m / V. Rearrange it to find mass (m = rho x V) or volume (V = m / rho). Switch the solve mode at the top of the calculator to use whichever form you need, and the unit conversions are handled automatically.
Why is the density of water 1 g/cm^3?
Pure water at 4 degrees C has a density of almost exactly 1 g/cm^3, the same as 1,000 kg/m^3 or 62.43 lb/ft^3. The gram and the milliliter were originally defined from water, which is why the number is so clean. At room temperature (~25 degrees C) water is about 0.997 g/cm^3, a difference small enough to ignore for most practical calculations.
Is 1 mL the same as 1 cm^3?
Yes. By definition, 1 mL = 1 cm^3 = 0.000001 m^3. Both volume units use the same conversion factor internally, so switching between them in the volume selector leaves your numeric result unchanged.
How do I convert g/cm^3 to lb/ft^3?
Multiply g/cm^3 by 62.428 to get lb/ft^3. Water (1 g/cm^3) comes out to 62.43 lb/ft^3; steel (7.85 g/cm^3) is about 490 lb/ft^3. The calculator displays the result in g/cm^3, kg/m^3, and lb/ft^3 at the same time, so you can read off whichever unit you need without doing the conversion yourself.
Why does ice float on water?
Ice has a density of about 0.917 g/cm^3, which is lower than liquid water at 1.000 g/cm^3. Any object less dense than the surrounding fluid displaces enough of it to stay afloat. That ~8% density gap means roughly 90% of an iceberg's volume sits below the waterline.