Density Calculator

Choose the tab for what you want to solve:

• Find Density: Enter the mass in grams and volume in cm³. The result is in g/cm³ with automatic comparison to water's density (1 g/cm³). Objects with density below 1 g/cm³ float; those above 1 g/cm³ sink.
• Find Mass: Enter density (g/cm³) and volume (cm³). The calculator outputs mass in grams, kilograms, pounds, and ounces. Use the reference table below to look up densities of common materials.
• Find Volume: Enter density and mass. The calculator returns volume in cm³, liters, cubic inches, and cubic feet.
• Unit converter: Type any density value, select its unit, and see all other units instantly.

All three modes use the same fundamental relationship: Density = Mass / Volume. Rearrange to solve for whichever variable you need.

Density = Mass / Volume       (D = M / V)
Mass    = Density × Volume    (M = D × V)
Volume  = Mass / Density      (V = M / D)

Standard SI unit: kg/m³
CGS unit: g/cm³ (same value as g/mL)

Conversions from g/cm³:
× 1,000     = kg/m³
× 62.428    = lb/ft³
× 0.036127  = lb/in³
× 0.578     = oz/in³

Note that g/cm³ and g/mL are identical units because 1 cm³ = 1 mL exactly. Water's density at 4°C is exactly 1.000 g/cm³, which is why it serves as the reference for specific gravity.

Specific gravity (relative density) is the ratio of a substance's density to water's density. Since water = 1 g/cm³, specific gravity equals the density number in g/cm³. Gold's specific gravity of 19.3 means it is 19.3 times denser than water.