Density Calculator

How to Use the Density Calculator

The Density Calculator solves the density equation (ρ = m/V) for any unknown variable. Enter any two of density, mass, and volume to find the third. It also includes a reference table of common material densities for quick lookups and comparisons.

The Density Formula

Density = Mass / Volume (ρ = m / V). Rearranged: Mass = Density × Volume (m = ρ × V). Volume = Mass / Density (V = m / ρ). Enter values in any compatible units and the calculator handles conversions automatically.

Supported Units

Mass units: grams, kilograms, pounds, ounces. Volume units: mL, liters, cubic centimeters, cubic meters, cubic inches, cubic feet, gallons. Density units: g/cm³, g/mL, kg/m³, lb/ft³, lb/in³. The calculator converts between all combinations.

Common Material Densities

Water: 1.0 g/cm³ (the reference standard). Air: 0.001225 g/cm³. Aluminum: 2.7 g/cm³. Iron: 7.87 g/cm³. Gold: 19.3 g/cm³. Lead: 11.34 g/cm³. Wood (oak): 0.6-0.9 g/cm³. Concrete: 2.3 g/cm³. Human body: ~1.01 g/cm³ (slightly denser than water).

Practical Applications

Determine if an object will float (density less than water = floats). Calculate shipping weights from package volumes. Identify unknown metals by measuring their density. Size storage containers for materials. Quality control in manufacturing relies on density measurements to verify material composition.

Specific Gravity

Specific gravity is the ratio of a substance density to water density (1.0 g/cm³). Since water density is 1 in CGS units, specific gravity and density in g/cm³ are numerically equal. Gold has a specific gravity of 19.3, meaning it is 19.3 times denser than water.

Frequently Asked Questions

Q: How do I measure the density of an irregular object?

A: Use water displacement. Weigh the object to find mass. Partially fill a graduated cylinder, note the water level, submerge the object, and note the new level. The volume difference is the object volume. Divide mass by this volume for density. This is the Archimedes method.

Q: Does temperature affect density?

A: Yes. Most materials expand when heated, decreasing density. Water is densest at 4 degrees C (1.0000 g/cm³). At 100 degrees C, water density drops to 0.9584 g/cm³. Gases are very sensitive to temperature; their density decreases significantly with heating. The calculator uses standard conditions unless specified.

Q: What is the densest material?

A: Osmium is the densest naturally occurring element at 22.59 g/cm³, slightly denser than iridium (22.56 g/cm³). Both are about twice as dense as lead. In nuclear physics, neutron star matter has densities of about 10¹⁴ g/cm³, but this is not a material we encounter on Earth.