Convert density units — kg/m³, g/cm³, lb/ft³, lb/in³ and more.
| Unit | Name | Value |
|---|---|---|
| g/cm³ | Gram/Cubic Centimeter | 0.001 |
| kg/L | Kilogram/Liter | 0.001 |
| lb/ft³ | Pound/Cubic Foot | 0.062427818 |
| lb/in³ | Pound/Cubic Inch | 0.000036127298 |
| oz/in³ | Ounce/Cubic Inch | 0.00057803802 |
| t/m³ | Tonne/Cubic Meter | 0.001 |
Formula: lb/ft³ = kg/m³ × 0.06243
Multiply any kg/m³ value by 0.06243 to get lb/ft³.
Reverse: kg/m³ = lb/ft³ × 16.02
Common materials — factor: 1 kg/m³ = 0.06243 lb/ft³
| kg/m³ (kg/m³) | lb/ft³ (lb/ft³) | Material |
|---|---|---|
| 0.0001 kg/m³ | 6.243e-06 lb/ft³ | Near vacuum |
| 0.001 kg/m³ | 6.243e-05 lb/ft³ | Very low density gas |
| 0.1 kg/m³ | 0.006243 lb/ft³ | Low pressure gas |
| 1 kg/m³ | 0.06243 lb/ft³ | Hydrogen gas |
| 1.225 kg/m³ | 0.07647 lb/ft³ | Air at sea level |
| 100 kg/m³ | 6.243 lb/ft³ | Light foam |
| 700 kg/m³ | 43.7 lb/ft³ | Wood |
| 917 kg/m³ | 57.25 lb/ft³ | Ice |
| 1000 kg/m³ | 62.43 lb/ft³ | Water |
| 1025 kg/m³ | 63.99 lb/ft³ | Seawater |
| 1600 kg/m³ | 99.88 lb/ft³ | Sand/gravel |
| 2700 kg/m³ | 168.6 lb/ft³ | Aluminum |
| 7850 kg/m³ | 490.1 lb/ft³ | Steel |
| 1.134e+04 kg/m³ | 707.9 lb/ft³ | Lead |
| 1.93e+04 kg/m³ | 1205 lb/ft³ | Gold |
kg/m³ × 0.06243 = lb/ft³. Round to × 0.0624.
1,000 kg/m³ = 62.4 lb/ft³ (water). 7,850 kg/m³ = 490 lb/ft³ (steel).
lb/ft³ × 16.018 = kg/m³.
Compares material densities to optimize weight-to-strength ratios in product design.
Calculates dead loads from material densities for structural design in kg/m³ and lb/ft³.
Selects lightweight materials (aluminum, titanium, composites) based on density in g/cm³ or lb/in³.
Measures crude oil and drilling fluid density in kg/m³ or lb/ft³ for reservoir engineering.
Measures soil and rock bulk density in t/m³ for foundation and slope stability analysis.
Uses density in g/cm³ for solution concentration, specific gravity, and process design calculations.
Kilograms per cubic meter (kg/m³) is the SI unit of density, defined as the mass in kilograms contained in one cubic meter of a substance. It became the international standard with the adoption of the SI system in 1960.
Most physical and engineering tables express density in kg/m³: water = 1,000 kg/m³, air = 1.225 kg/m³, steel = 7,850 kg/m³, gold = 19,300 kg/m³. The kg/m³ is the base unit for Archimedes' buoyancy calculations and fluid dynamics.
Interesting fact: The density of the Sun's core is about 150,000 kg/m³ — 150 times denser than water. Osmium, the densest naturally occurring element, has a density of 22,590 kg/m³, nearly twice that of lead.
Pounds per cubic foot (lb/ft³) is the standard density unit in US engineering and construction. One lb/ft³ equals approximately 16.018 kg/m³. It is used for structural materials, soil, insulation, and HVAC calculations in American practice.
Common lb/ft³ values: air = 0.0765 lb/ft³, water = 62.4 lb/ft³, concrete = 145–150 lb/ft³, structural steel = 490 lb/ft³, wood varies 20–50 lb/ft³. ASHRAE tables for HVAC use lb/ft³ for air and refrigerant densities.
Interesting fact: Aerogel, the world's least dense solid material, has a density of about 0.1–1 lb/ft³ (1.6–16 kg/m³). It is primarily composed of air and can support thousands of times its own weight.
Converting kg/m³ to lb/ft³ is common in materials science, engineering, and manufacturing. SI units (kg/m³, g/cm³) are standard in scientific and metric engineering contexts, while Imperial units (lb/ft³, lb/in³) are used in US construction and aerospace. Water at 4°C = 1000 kg/m³ = 62.43 lb/ft³ — a universal anchor for density comparisons.
Exact factor: 1 kg/m³ = 0.06243 lb/ft³. Reverse: 1 lb/ft³ = 16.02 kg/m³.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.