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Pressure

psftoksi

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

Factor1 psf = 6.944444e-6 ksi

Converter

psf

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

Result
0.694444ksi

Rendered to 6 significant figures.

Formula

Formula
ksi = psf × 6.944444e-6

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

Worked example

Convert 100000 psf to ksi.

  1. 01Start with 100000 psf.
  2. 02Multiply by the conversion factor: 100000 × 6.944444e-6 = 0.694444 ksi.
Result100000 psf = 0.694444 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 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 to kilopound-force per square inch?
Pressure conversions between psf and ksi are common when working with mixed-vendor instrumentation, when piping codes use different units to process datasheets, or when converting field readings into SI for hydraulic calculations.
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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