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Density and Mass

lb/in³toSG

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

Factor1 lb/in³ = 27.6799 SG

Converter

lb/in³

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

Result
0.996477SG

Rendered to 6 significant figures.

Formula

Formula
SG = lb/in³ × 27.6799

Multiply any value in pounds per cubic inch by 27.6799 to obtain the value in specific gravity (water).

Worked example

Convert 0.036 lb/in³ to SG.

  1. 01Start with 0.036 lb/in³.
  2. 02Multiply by the conversion factor: 0.036 × 27.6799 = 0.996477 SG.
Result0.036 lb/in³ = 0.996477 SG

Conversion table

lb/in³SG
127.68
255.36
5138.4
10276.8
20553.6
501384
1002768
2005536
50013840
100027680

Reference values rounded to 5 significant figures for display.

FAQ

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