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Density and Mass

lb/in³tolb/gal

Convert pounds per cubic inch (lb/in³) to pounds per US gallon (lb/gal).

Factor1 lb/in³ = 231 lb/gal

Converter

lb/in³

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

Result
8.316lb/gal

Rendered to 6 significant figures.

Formula

Formula
lb/gal = lb/in³ × 231

Multiply any value in pounds per cubic inch by 231 to obtain the value in pounds per US gallon.

Worked example

Convert 0.036 lb/in³ to lb/gal.

  1. 01Start with 0.036 lb/in³.
  2. 02Multiply by the conversion factor: 0.036 × 231 = 8.316 lb/gal.
Result0.036 lb/in³ = 8.316 lb/gal

Conversion table

lb/in³lb/gal
1231
2462
51155
102310
204620
5011550
10023100
20046200
5001.1550e+5
10002.3100e+5

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from lb/in³ to lb/gal?
1 lb/in³ equals 231 lb/gal. To convert, multiply the value in pounds per cubic inch by 231.
How do I convert 1 lb/in³ to lb/gal?
1 lb/in³ = 231 lb/gal. For any value, multiply by 231.
How do I convert lb/gal back to lb/in³?
Divide by the same factor — or equivalently, multiply by 0.004329004. So 1 lb/gal = 0.004329 lb/in³.
When would I need to convert pound per cubic inch 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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