Density Calculator

You pick what you want to solve for, density, mass, or volume, then enter the other two values with their units. It converts everything to grams and cubic centimeters, applies the density formula, and converts the answer back. You can also load a material like water or steel to fill in the density for you. Everything runs in your browser, so you'll see the result update as you type, and nothing you enter leaves your device.

Density is mass divided by volume. You weigh the object, measure how much space it takes up, then divide the first by the second. So a block with a mass of 200 grams and a volume of 100 cubic centimeters has a density of 2 grams per cubic centimeter. If you rearrange the formula, mass is density times volume, and volume is mass divided by density, which is why this tool can solve for any one of the three.

Pure water is almost exactly 1 gram per cubic centimeter, or 1,000 kilograms per cubic meter, at around 4 degrees Celsius where it's densest. That tidy number is why water is the reference point for specific gravity, the ratio of a material's density to water's. Anything denser than 1 sinks in water and anything less floats, which is why ice, at about 0.92, bobs on the surface. You can load water as a preset here in one tap.

It handles the common ones and converts for you. Mass takes grams, kilograms, or pounds; volume takes milliliters, liters, cubic centimeters, or cubic meters; and density reads in grams per cubic centimeter or kilograms per cubic meter. A milliliter and a cubic centimeter are the same size, so they're interchangeable. Pick whatever matches your measurements and the tool lines up the conversions behind the scenes so the answer comes out right.

Specific gravity is how dense something is compared to water, so it's just the density divided by 1 gram per cubic centimeter. Because it's a ratio, it has no units, and it tells you at a glance whether something floats. Gold has a specific gravity near 19.3, so it's about 19 times denser than water, while oil sits near 0.9 and floats. If you read density in grams per cubic centimeter, the number is also the specific gravity.

Yes, it's completely free, with no sign-up, and it runs right in your browser, so nothing you enter leaves your device. Choose what to solve for, type your values, and read the answer in a tap, or load a material to skip the density. Bookmark it for chemistry and physics homework, lab work, or shipping and material estimates, and you'll have the density formula and the answer in one place.