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Density and Mass

lb/in³tolb/ft³

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

Factor1 lb/in³ = 1728 lb/ft³

Converter

lb/in³

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

Result
490.752lb/ft³

Rendered to 6 significant figures.

Formula

Formula
lb/ft³ = lb/in³ × 1728

Multiply any value in pounds per cubic inch by 1728 to obtain the value in pounds per cubic foot.

Worked example

Convert 0.284 lb/in³ to lb/ft³.

  1. 01Start with 0.284 lb/in³.
  2. 02Multiply by the conversion factor: 0.284 × 1728 = 490.752 lb/ft³.
Result0.284 lb/in³ = 490.752 lb/ft³

Conversion table

lb/in³lb/ft³
11728
23456
58640
1017280
2034560
5086400
1001.7280e+5
2003.4560e+5
5008.6400e+5
10001.7280e+6

Reference values rounded to 5 significant figures for display.

FAQ

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