Mass Calculator: Density, Volume & Weight
Find mass from density and volume—or from shape dimensions. Searchable materials. Volume formulas for cylinder, sphere, cube, and rectangular prism. Results in kg, g, lb, oz, plus weight in N and lbf. No sign-up.
How to Calculate Mass from Density and Volume
Mass is density times volume: . Water at 1000 kg/m³ in one cubic meter gives 1000 kg of mass. Gold at 19,300 kg/m³ in the same volume gives 19.3 tonnes. The searchable material library lets you pick water, steel, aluminum, or dozens of others to auto-fill density. You can still edit it. Volume can be entered directly in cm³, m³, liters, or gallons, or computed from shape dimensions.
Volume by Shape: Cylinder, Sphere, Cube, Prism
Turn on "Calculate Volume by Shape" to enter dimensions instead of volume. Cylinder: . Sphere: . Cube: side³. Rectangular prism: length × width × height. Use meters or centimeters; the calculator converts and multiplies by density to get mass.
Weight vs Mass and Weight on Other Planets
Mass is the amount of matter; weight is the force of gravity on it. On Earth, weight in Newtons is mass × 9.81; in pound-force it is roughly mass (kg) × 2.2. The same mass has different weights elsewhere: on the Moon about one-sixth of Earth, on Mars about 38%, on Jupiter about 2.5×. The Information Hub shows your mass converted to weight (N) on the Moon, Mars, and Jupiter.
Mass Calculator FAQ
? How do I calculate mass from density and volume?
Use the formula . For water (1000 kg/m³) in a 0.5 m³ container, that's 500 kg. Pick a material from the dropdown to auto-fill density, or type it in yourself.
? What is the formula for volume of a cylinder?
Cylinder volume uses —radius squared times height. Turn on "Calculate Volume by Shape," choose Cylinder, then plug in r and h. The tool multiplies that by density to get mass.
? What is the difference between weight and mass?
Mass is how much matter you have (kg or lb); it stays the same everywhere. Weight is the pull of gravity on that mass. On Earth, a 70 kg person weighs about 687 N or 154 lbf. Same person on the Moon: same mass, but roughly one-sixth the weight.
? How do I find the weight on Mars or Jupiter?
Weight = mass × local gravity. Mars has about 0.38× Earth's g, Jupiter about 2.5×. Enter density and volume to get mass, then the Information Hub shows what that mass would "weigh" in Newtons on the Moon, Mars, and Jupiter.