Calculation results
| Density (kg/m3) | ||
| Density (oz/in3) | ||
| Density (lb/ft3) | ||
| Density (lb/yd3) | ||
| Density (g/litre) | ||
| Mass | ||
| Volume |
Created by CalculatorOK Team · Last updated: Oct 18, 2025
Density Calculator
What the Density Calculator does
Density answers one deceptively simple question: how tightly is mass packed into a given volume? The calculator takes any two of Mass, Volume, and Density and instantly solves for the missing third. Material identifiers, shipping agents converting weights, and chemistry students checking lab results all use it daily.
Water is the reference point everyone knows: 1000 kg per cubic meter, which equals 1 g per cubic centimeter. Anything measuring less than that will float, and anything greater will sink.
The formula and a worked example
Density equals mass divided by volume, so identical volumes of lead and feather differ by a factor of thousands. Rearranging the same equation gives mass = density x volume or volume = mass / density whenever the reverse is needed.
Take a 2-kilogram block that displaces 0.0025 cubic meters of water. Then density = 2 / 0.0025 = 800 kg per cubic meter, which is 0.8 g per cubic centimeter. That value sits below water's 1000 kg/m3, which is exactly why woods and oils float. Any block denser than 1 g per cubic centimeter would sink instead.
Using the calculator step by step
Enter any two fields you know, such as Mass in grams or kilograms and Volume in cubic centimeters or liters, then press Calculate to obtain Density. To work backward, supply Density and one of the others instead. The tool rearranges automatically, so no algebra is required.
Keep conversions in mind: 1 g/cm3 equals 1000 kg/m3, and 1 liter equals 1000 cubic centimeters. Temperature also matters, because most materials expand when heated and their density drops slightly, while water famously peaks near 4 degrees Celsius.
Frequently Asked Questions
What is the density of water?
Pure water near 4 degrees Celsius reaches its maximum density of 1000 kg per cubic meter, equal to 1 gram per cubic centimeter. Warmer or colder water is slightly less dense than that.
How do I convert g/cm3 to kg/m3?
Multiply by 1000, because one gram per cubic centimeter equals 1000 kilograms per cubic meter. A material measuring 0.8 g/cm3 is therefore 800 kg/m3, which describes many common oils.
Can this calculator find missing volume?
Yes, enter Mass and Density and leave Volume blank. The tool rearranges density = mass divided by volume automatically, returning volume = mass divided by density without any algebra.
Why does an object float or sink?
Objects less dense than the surrounding liquid float, while denser ones sink. At 800 kg/m3, the block in our example rides comfortably above water at 1000 kg/m3.
Does temperature change a material's density?
Most materials expand when heated, so the same mass fills more volume and density drops. Water behaves unusually below 4 degrees, which is why ice floats on liquid water.