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Stress

psftopsi

Convert pounds-force per square foot (stress) (psf) to pounds-force per square inch (stress) (psi).

Factor1 psf = 0.006944444 psi

Converter

psf

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

Result
6.94444psi

Rendered to 6 significant figures.

Formula

Formula
psi = psf × 0.006944444

Multiply any value in pounds-force per square foot (stress) by 0.006944444 to obtain the value in pounds-force per square inch (stress).

Worked example

Convert 1000 psf to psi.

  1. 01Start with 1000 psf.
  2. 02Multiply by the conversion factor: 1000 × 0.006944444 = 6.94444 psi.
Result1000 psf = 6.94444 psi

Conversion table

psfpsi
10.0069444
20.013889
50.034722
100.069444
200.13889
500.34722
1000.69444
2001.3889
5003.4722
10006.9444

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from psf to psi?
1 psf equals 0.006944444 psi. To convert, multiply the value in pounds-force per square foot (stress) by 0.006944444.
How do I convert 1 psf to psi?
1 psf = 0.00694444 psi. For any value, multiply by 0.006944444.
How do I convert psi back to psf?
Divide by the same factor — or equivalently, multiply by 144. So 1 psi = 144 psf.
When would I need to convert pound-force per square foot (stress) to pound-force per square inch (stress)?
Stress conversions between psf and psi are routine in mechanics-of-materials work: yield, ultimate and allowable-stress specification, Young's-modulus tables and structural-design code calculations. MPa and N/mm² dominate ISO and European datasheets, psi and ksi dominate US structural codes, and kgf/cm² and kgf/mm² appear in legacy JIS and heavy-engineering documentation. Stress is the same physical dimension as pressure but a different engineering quantity — this category is mechanics-of-materials, not process pressure.
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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