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Density and Mass

SGtolb/gal

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

Factor1 SG = 8.345404 lb/gal

Converter

SG

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

Result
7.09359lb/gal

Rendered to 6 significant figures.

Formula

Formula
lb/gal = SG × 8.345404

Multiply any value in specific gravity (water) by 8.345404 to obtain the value in pounds per US gallon.

Worked example

Convert 0.85 SG to lb/gal.

  1. 01Start with 0.85 SG.
  2. 02Multiply by the conversion factor: 0.85 × 8.345404 = 7.09359 lb/gal.
Result0.85 SG = 7.09359 lb/gal

Conversion table

SGlb/gal
18.3454
216.691
541.727
1083.454
20166.91
50417.27
100834.54
2001669.1
5004172.7
10008345.4

Reference values rounded to 5 significant figures for display.

FAQ

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