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Density and Mass

lb/galtoSG

Convert pounds per US gallon (lb/gal) to specific gravity (water) (SG).

Factor1 lb/gal = 0.1198264 SG

Converter

lb/gal

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

Result
0.999352SG

Rendered to 6 significant figures.

Formula

Formula
SG = lb/gal × 0.1198264

Multiply any value in pounds per US gallon by 0.1198264 to obtain the value in specific gravity (water).

Worked example

Convert 8.34 lb/gal to SG.

  1. 01Start with 8.34 lb/gal.
  2. 02Multiply by the conversion factor: 8.34 × 0.1198264 = 0.999352 SG.
Result8.34 lb/gal = 0.999352 SG

Conversion table

lb/galSG
10.11983
20.23965
50.59913
101.1983
202.3965
505.9913
10011.983
20023.965
50059.913
1000119.83

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from lb/gal to SG?
1 lb/gal equals 0.1198264 SG. To convert, multiply the value in pounds per US gallon by 0.1198264.
How do I convert 1 lb/gal to SG?
1 lb/gal = 0.119826 SG. For any value, multiply by 0.1198264.
How do I convert SG back to lb/gal?
Divide by the same factor — or equivalently, multiply by 8.345404. So 1 SG = 8.3454 lb/gal.
When would I need to convert pound per US gallon to specific gravity (water)?
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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