Density / lb/ft³ → lb/US gal
Convert Pounds per cubic foot to Pounds per US gallon
Convert mass per unit volume in SI and customary units. Convert Pounds per cubic foot (lb/ft³) to Pounds per US gallon (lb/US gal). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Pounds per US gallon to Pounds per cubic foot →
How to convert pounds per cubic foot to Pounds per US gallon
Density connects mass and volume for a specified material and state. Specific gravity needs a reference density and is not directly treated as a density unit.
Use x for the value in lb/ft³, b for the intermediate value in kg/m³, and y for the result in lb/US gal.
lb/US gal = lb/ft³ × 16.018463373960138 ÷ 119.82642731689663
Worked examples
10 lb/ft³ ≈ 1.33680555556 lb/US gal
Step 1: (10 × 16.018463374) ≈ 160.18463374 kg/m³.
Step 2: 160.18463374 ÷ 119.826427317 ≈ 1.33680555556 lb/US gal.20 lb/ft³ ≈ 2.67361111111 lb/US gal
Step 1: (20 × 16.018463374) ≈ 320.369267479 kg/m³.
Step 2: 320.369267479 ÷ 119.826427317 ≈ 2.67361111111 lb/US gal.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Pounds per cubic foot
Pounds per cubic foot (lb/ft³) measures density under the conventions above. The base value in kg/m³ is (x × 16.018463374), where x is the numerical value in lb/ft³. Factors shown here are rounded for display; calculations use the stored factor.
About Pounds per US gallon
Pounds per US gallon (lb/US gal) measures density under the conventions above. The base value in kg/m³ is (x × 119.826427317), where x is the numerical value in lb/US gal. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Pounds per cubic foot to Pounds per US gallon reference table
| Pounds per cubic foot (lb/ft³) | Pounds per US gallon (lb/US gal) |
|---|---|
| 1 | 0.133680555556 |
| 5 | 0.668402777778 |
| 10 | 1.33680555556 |
| 25 | 3.34201388889 |
| 50 | 6.68402777778 |
| 100 | 13.3680555556 |
| 1000 | 133.680555556 |
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