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Stress

psftoksi

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

Factor1 psf = 6.944444e-6 ksi

Converter

psf

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

Result
6.94444ksi

Rendered to 6 significant figures.

Formula

Formula
ksi = psf × 6.944444e-6

Multiply any value in pounds-force per square foot (stress) by 6.944444e-6 to obtain the value in kilopounds-force per square inch (stress).

Worked example

Convert 1.00000e+6 psf to ksi.

  1. 01Start with 1.00000e+6 psf.
  2. 02Multiply by the conversion factor: 1.00000e+6 × 6.944444e-6 = 6.94444 ksi.
Result1.00000e+6 psf = 6.94444 ksi

Conversion table

psfksi
16.9444e-6
21.3889e-5
53.4722e-5
106.9444e-5
200.00013889
500.00034722
1000.00069444
2000.0013889
5000.0034722
10000.0069444

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from psf to ksi?
1 psf equals 6.944444e-6 ksi. To convert, multiply the value in pounds-force per square foot (stress) by 6.944444e-6.
How do I convert 1 psf to ksi?
1 psf = 6.94444e-6 ksi. For any value, multiply by 6.944444e-6.
How do I convert ksi back to psf?
Divide by the same factor — or equivalently, multiply by 144000. So 1 ksi = 144000 psf.
When would I need to convert pound-force per square foot (stress) to kilopound-force per square inch (stress)?
Stress conversions between psf and ksi 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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