Density Calculator
Calculate density from mass and volume, or find mass or volume from density.
How much matter in a space
Density is how much mass is packed into a given volume — it is what makes a small lump of lead heavy and a large piece of foam light. This calculates density from mass and volume, or finds any of the three from the other two, a core property in science, engineering and everyday questions about materials.
Enter two of mass, volume and density to get the third.
Why things float, and how to identify them
Density explains one of the most familiar phenomena: whether something floats. An object less dense than water floats, denser than water sinks, which is why a huge steel ship floats — its overall density, hull and air together, is less than water even though steel alone sinks. Density is also how materials are identified and purity is checked, since every pure substance has a characteristic density.
Frequently asked questions
Why do some things float and others sink?
An object less dense than water floats and denser than water sinks — which is how a steel ship floats, its overall density being less than water.
What is density used for?
Identifying materials, checking purity, and understanding buoyancy — every pure substance has a characteristic density.
Is anything uploaded?
No. The calculation happens in your browser.