Density Calculator

Density tells you how much matter is packed into a given space. Water has a density of 1.0 g/cm³. Objects less dense than water float; denser ones sink. Density is used in chemistry, engineering, materials science, and everyday tasks like identifying unknown substances.

• Material identification: Measure mass and volume, then compare density to a reference table to identify metals, minerals, or liquids.
• Buoyancy problems: Determine if an object will float or sink by comparing its density to water.
• Chemistry lab: Calculate the density of liquids or solids as part of lab experiments.
• Quality control: Density checks can verify material purity. Impurities change density, making it a useful quick test.

1. 1Enter the mass of the object in grams.
2. 2Enter the volume in cubic centimeters (cm³ = mL).
3. 3The calculator divides mass by volume to get density in g/cm³.
4. 4The result is also shown in kg/m³ and compared to water.

• Confusing volume units: Density in g/cm³ requires mass in grams and volume in cm³ (same as mL for liquids). If your volume is in liters, convert first: 1 L = 1,000 cm³.
• Using weight instead of mass: Density uses mass, not weight. On Earth, grams and kilograms measure mass. Newtons measure force (weight). For most lab and everyday calculations, the distinction does not matter, but it matters for physics problems.
• Not accounting for temperature: Density of liquids and gases changes with temperature. Water is densest at 4°C (1.000 g/cm³) and less dense when colder or warmer. Specify temperature when recording density measurements for comparison.
• Mixing mass and density units: If mass is in kg and volume is in mL, the result will be in kg/mL, not g/cm³. Convert both to the same unit system before dividing.

• Use water as your reference point: Pure water has a density of 1 g/cm³ at 4°C. Materials denser than 1 sink in water; less dense materials float. This quick check verifies whether a result is physically plausible.
• Rearrange to find mass or volume: If you know density and one other value, enter the known values. The calculator solves for the third. This is useful for finding the volume of a material from its mass and known density.
• Use for material identification: Many materials have characteristic densities. If you measure the mass and volume of an unknown metal, comparing the calculated density to known values (aluminum: 2.7 g/cm³, iron: 7.87 g/cm³) can help identify it.
• Check units before submitting a lab report: Density reported in g/mL and g/cm³ are numerically equivalent (1 mL = 1 cm³), but kg/m³ differs by a factor of 1,000. Double-check which unit your teacher or client expects.