Conversion Formula
$$lb/gal = lb/ft³ \times 0.133681$$
Multiply the value in Pound per Cubic Foot by 0.133681 to get Pound per US Gallon.
lb/ft³ to lb/gal Conversion Table
| Pound per Cubic Foot (lb/ft³) | Pound per US Gallon (lb/gal) |
|---|---|
| 0.1 | 0.0133681 |
| 0.5 | 0.0668403 |
| 1 | 0.133681 |
| 2 | 0.267361 |
| 5 | 0.668403 |
| 10 | 1.33681 |
| 25 | 3.34201 |
| 50 | 6.68403 |
| 100 | 13.3681 |
| 250 | 33.4201 |
| 500 | 66.8403 |
| 1,000 | 133.681 |
lb/ft³ to lb/gal in Engineering
Density conversions are critical for fluid mechanics, material selection, concrete mix design, and petroleum engineering. Specific gravity (relative to water at 4°C) is commonly used as a dimensionless density ratio across all disciplines.
Pound per Cubic Foot: Primary US density unit. Water = 62.4 lb/ft³. Used for soil, concrete, aggregate, and material densities.
Pound per US Gallon: Common for liquid densities in US practice. Water = 8.345 lb/gal. Used in petroleum and chemical processing.