Density Unit Converter
Convert material density between kg/m³, g/cm³, lb/ft³, lb/in³, and specific gravity with common substance density benchmarks.
All Equivalent Density Units
Understanding Density
Density measures the compact mass of a substance per unit volume ($ ho = m/V$). In the metric SI system, density is expressed in kilograms per cubic meter ($ ext{kg/m}^3$) or grams per cubic centimeter ($ ext{g/cm}^3$). In imperial and civil engineering, pounds per cubic foot ($ ext{lb/ft}^3$) is common.
Frequently Asked Questions
Why is water's density exactly 1.0 g/cm³?
The metric system was originally calibrated using water: the gram was defined in 1795 as the mass of one cubic centimeter of pure water at the melting point of ice.
How do you convert lb/ft³ to g/cm³?
Multiply lb/ft³ by 0.0160185. For instance, water at 62.4 lb/ft³ equals 62.4 × 0.0160185 ≈ 1.00 g/cm³.