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Density and Mass

lb/ft³tolb/in³

Convert pounds per cubic foot (lb/ft³) to pounds per cubic inch (lb/in³).

Factor1 lb/ft³ = 0.0005787037 lb/in³

Converter

lb/ft³

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

Result
0.283565lb/in³

Rendered to 6 significant figures.

Formula

Formula
lb/in³ = lb/ft³ × 0.0005787037

Multiply any value in pounds per cubic foot by 0.0005787037 to obtain the value in pounds per cubic inch.

Worked example

Convert 490 lb/ft³ to lb/in³.

  1. 01Start with 490 lb/ft³.
  2. 02Multiply by the conversion factor: 490 × 0.0005787037 = 0.283565 lb/in³.
Result490 lb/ft³ = 0.283565 lb/in³

Conversion table

lb/ft³lb/in³
10.0005787
20.0011574
50.0028935
100.005787
200.011574
500.028935
1000.05787
2000.11574
5000.28935
10000.5787

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from lb/ft³ to lb/in³?
1 lb/ft³ equals 0.0005787037 lb/in³. To convert, multiply the value in pounds per cubic foot by 0.0005787037.
How do I convert 1 lb/ft³ to lb/in³?
1 lb/ft³ = 0.000578704 lb/in³. For any value, multiply by 0.0005787037.
How do I convert lb/in³ back to lb/ft³?
Divide by the same factor — or equivalently, multiply by 1728. So 1 lb/in³ = 1728 lb/ft³.
When would I need to convert pound per cubic foot 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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