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Density and Mass

SGtolb/in³

Convert specific gravity (water) (SG) to pounds per cubic inch (lb/in³).

Factor1 SG = 0.03612729 lb/in³

Converter

SG

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

Result
0.0307082lb/in³

Rendered to 6 significant figures.

Formula

Formula
lb/in³ = SG × 0.03612729

Multiply any value in specific gravity (water) by 0.03612729 to obtain the value in pounds per cubic inch.

Worked example

Convert 0.85 SG to lb/in³.

  1. 01Start with 0.85 SG.
  2. 02Multiply by the conversion factor: 0.85 × 0.03612729 = 0.0307082 lb/in³.
Result0.85 SG = 0.0307082 lb/in³

Conversion table

SGlb/in³
10.036127
20.072255
50.18064
100.36127
200.72255
501.8064
1003.6127
2007.2255
50018.064
100036.127

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from SG to lb/in³?
1 SG equals 0.03612729 lb/in³. To convert, multiply the value in specific gravity (water) by 0.03612729.
How do I convert 1 SG to lb/in³?
1 SG = 0.0361273 lb/in³. For any value, multiply by 0.03612729.
How do I convert lb/in³ back to SG?
Divide by the same factor — or equivalently, multiply by 27.6799. So 1 lb/in³ = 27.6799 SG.
When would I need to convert specific gravity (water) to pound per cubic inch?
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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