Convert pound per cubic foot to pound per cubic inch instantly. Type in either field — results update live.
Selected lb/ft³ values converted to lb/in³ using the exact factor from this tool.
| lb/ft³ | lb/in³ |
|---|---|
| 0.01 | 0.000005787 |
| 0.1 | 0.0000578704 |
| 1 | 0.0005787037 |
| 2 | 0.0011574074 |
| 3 | 0.0017361111 |
| 5 | 0.0028935185 |
| 10 | 0.005787037 |
| 20 | 0.0115740741 |
| 50 | 0.0289351852 |
| 100 | 0.0578703704 |
| 1,000 | 0.5787037038 |
Exact conversion factors in both directions, plus a worked example.
1 lb/ft³ = 0.0005787037 lb/in³
1 lb/in³ = 1727.9999997902 lb/ft³
To convert pound per cubic foot to pound per cubic inch, multiply by 0.0005787037.
To convert pound per cubic inch to pound per cubic foot, multiply by 1727.9999997902.
Example: convert 10 lb/ft³ to lb/in³
10 × 0.0005787037 = 0.005787037 lb/in³
Short background on the units used in this conversion.
The pound per cubic foot (lb/ft³) is an imperial density unit common in US construction and bulk material handling.
Pounds per cubic foot rate lumber, foam insulation, soil fill, and aggregate in US engineering references.
The pound per cubic inch (lb/in³) is a compact imperial density scale — about 27,680 kg/m³ per lb/in³.
Pounds per cubic inch describe metals and alloys in US machining, ballistics, and materials handbooks.
lb/in³ = lb/ft³ × 0.0005787037lb/ft³ = lb/in³ × 1,727.9999997902, using the same exact factors as this converter.Jump to any density conversion starting from pound per cubic foot — including the reverse direction and every other unit in our dataset.