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Stress

psitopsf

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

Factor1 psi = 144 psf

Converter

psi

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

Result
144psf

Rendered to 6 significant figures.

Formula

Formula
psf = psi × 144

Multiply any value in pounds-force per square inch (stress) by 144 to obtain the value in pounds-force per square foot (stress).

Worked example

Convert 1 psi to psf.

  1. 01Start with 1 psi.
  2. 02Multiply by the conversion factor: 1 × 144 = 144 psf.
Result1 psi = 144 psf

Conversion table

psipsf
1144
2288
5720
101440
202880
507200
10014400
20028800
50072000
10001.4400e+5

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from psi to psf?
1 psi equals 144 psf. To convert, multiply the value in pounds-force per square inch (stress) by 144.
How do I convert 1 psi to psf?
1 psi = 144 psf. For any value, multiply by 144.
How do I convert psf back to psi?
Divide by the same factor — or equivalently, multiply by 0.006944444. So 1 psf = 0.00694444 psi.
When would I need to convert pound-force per square inch (stress) to pound-force per square foot (stress)?
Stress conversions between psi and psf 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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