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Density and Mass

lb/ft³tolb/gal

Convert pounds per cubic foot (lb/ft³) to pounds per US gallon (lb/gal).

Factor1 lb/ft³ = 0.1336806 lb/gal

Converter

lb/ft³

Accepts numbers or expressions, e.g. 150 + 14.7

Result
8.34167lb/gal

Rendered to 6 significant figures.

Formula

Formula
lb/gal = lb/ft³ × 0.1336806

Multiply any value in pounds per cubic foot by 0.1336806 to obtain the value in pounds per US gallon.

Worked example

Convert 62.4 lb/ft³ to lb/gal.

  1. 01Start with 62.4 lb/ft³.
  2. 02Multiply by the conversion factor: 62.4 × 0.1336806 = 8.34167 lb/gal.
Result62.4 lb/ft³ = 8.34167 lb/gal

Conversion table

lb/ft³lb/gal
10.13368
20.26736
50.6684
101.3368
202.6736
506.684
10013.368
20026.736
50066.84
1000133.68

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from lb/ft³ to lb/gal?
1 lb/ft³ equals 0.1336806 lb/gal. To convert, multiply the value in pounds per cubic foot by 0.1336806.
How do I convert 1 lb/ft³ to lb/gal?
1 lb/ft³ = 0.133681 lb/gal. For any value, multiply by 0.1336806.
How do I convert lb/gal back to lb/ft³?
Divide by the same factor — or equivalently, multiply by 7.480519. So 1 lb/gal = 7.48052 lb/ft³.
When would I need to convert pound per cubic foot to pound per US gallon?
Density conversions are critical for fluid property datasheets, hydraulic head calculations, and reconciling lab measurements (often g/cm³) with process simulator inputs (kg/m³).
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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