Pound per cubic foot to Kilogram per cubic meter Conversion Table
| Pound per cubic foot (lb/ft3) | Kilogram per cubic meter (kg/m3) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 0.0765 lb/ft³ | 1.225 kg/m³ | Dry atmospheric air at standard temperature and pressure | 0.0765 × 16.0185 = 1.225 kg/m³ |
| 7.491 lb/ft³ | 120 kg/m³ | Aviation balsa wood lightweight core material | 7.491 × 16.0185 = 120 kg/m³ |
| 14.983 lb/ft³ | 240 kg/m³ | Natural cork stopper insulation material | 14.983 × 16.0185 = 240 kg/m³ |
| 33.337 lb/ft³ | 534 kg/m³ | Elemental metallic lithium solid | 33.337 × 16.0185 = 534 kg/m³ |
| 42.451 lb/ft³ | 680 kg/m³ | Automotive gasoline motor fuel blend | 42.451 × 16.0185 = 680 kg/m³ |
| 49.942 lb/ft³ | 800 kg/m³ | Industrial denatured ethyl alcohol | 49.942 × 16.0185 = 800 kg/m³ |
| 57.246 lb/ft³ | 917 kg/m³ | Freshwater ice crystal density at 0°C | 57.246 × 16.0185 = 917 kg/m³ |
| 62.303 lb/ft³ | 998 kg/m³ | Liquid water density at ambient 20°C | 62.303 × 16.0185 = 998 kg/m³ |
| 62.428 lb/ft³ | 1,000 kg/m³ | Pure liquid water density baseline at 4°C | 62.428 × 16.0185 = 1,000 kg/m³ |
| 78.659 lb/ft³ | 1,260 kg/m³ | Pharmaceutical grade vegetable glycerin | 78.659 × 16.0185 = 1,260 kg/m³ |
| 149.827 lb/ft³ | 2,400 kg/m³ | Standard reinforced structural building concrete | 149.827 × 16.0185 = 2,400 kg/m³ |
| 168.556 lb/ft³ | 2,700 kg/m³ | Commercial aerospace aluminum alloy 6061 | 168.556 × 16.0185 = 2,700 kg/m³ |
| 490.06 lb/ft³ | 7,850 kg/m³ | Structural carbon construction steel | 490.06 × 16.0185 = 7,850 kg/m³ |
| 559.355 lb/ft³ | 8,960 kg/m³ | Pure electrical grade copper cathode | 559.355 × 16.0185 = 8,960 kg/m³ |
| 707.933 lb/ft³ | 11,340 kg/m³ | Refined elemental lead radiation shield | 707.933 × 16.0185 = 11,340 kg/m³ |
| 1,206.108 lb/ft³ | 19,320 kg/m³ | Refined 24-karat monetary bullion gold | 1,206.108 × 16.0185 = 19,320 kg/m³ |
Pound per cubic foot to Kilogram per cubic meter Formula & Unit Definitions
The exact ratio is defined by international metric and imperial treaties: 1 pound equals 0.45359237 kg, and 1 cubic foot equals exactly (0.3048 m)³ = 0.028316846592 m³. Dividing mass by volume yields 0.45359237 / 0.028316846592 ≈ 16.0184634 kg/m³ per 1 lb/ft³. Consequently, multiplying any density in lb/ft³ by 16.0184634 converts it directly to kg/m³.
Quick Estimation: To estimate lb/ft³ to kg/m³ mentally, multiply by 16 (or multiply by 160 and divide by 10). For example, concrete at 150 lb/ft³ multiplied by 16 gives approximately 2,400 kg/m³.
Pound per cubic foot (lb/ft3)
Source Unit- Primary imperial density unit in US civil engineering, HVAC airflow, and foundation design.
- Measures the gravitational force in pounds or mass contained in a 1-foot cube.
- Anchored around liquid water at ~62.4 lb/ft³ and reinforced structural concrete at ~150 lb/ft³.
Kilograms per Cubic Meter (kg/m³)
Target Unit- Coherent International System of Units (SI) derived base density unit (kg·m⁻³).
- Standard unit across ISO engineering standards, Eurocode structural design, and CFD solvers.
- Expresses total mass in a 1 m³ cube, equaling approximately 16 times the lb/ft³ figure.
Frequently Asked Questions
Q.What is the exact formula for lb/ft³ to kg/m³?
Density (kg/m³) = Density (lb/ft³) × 16.0184634. For the reverse conversion from kg/m³ to lb/ft³, multiply by 0.06242796.
Q.What is the physical difference between Pound per cubic foot and Kilogram per cubic meter?
Pound per cubic foot is an imperial engineering unit commonly used in American building codes, while Kilogram per cubic meter is the international coherent SI base derived density unit.
Q.What is the quick mental shortcut for lb/ft³ to kg/m³?
Multiply the lb/ft³ figure by 16. For example, water at 62.4 lb/ft³ multiplied by 16 equals approximately 998.4 kg/m³, within 0.16% of the exact 1,000 kg/m³ baseline.