Pressure
psitopsf
Convert pounds-force per square inch (psi) to pounds-force per square foot (psf).
Factor1 psi = 144 psf
Converter
psi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
psf
Rendered to 6 significant figures.
Formula
Formula
psf = psi × 144
Multiply any value in pounds-force per square inch by 144 to obtain the value in pounds-force per square foot.
Worked example
Convert 1 psi to psf.
- 01Start with 1 psi.
- 02Multiply by the conversion factor: 1 × 144 = 144 psf.
Result1 psi = 144 psf
Conversion table
| psi | psf |
|---|---|
| 1 | 144 |
| 2 | 288 |
| 5 | 720 |
| 10 | 1440 |
| 20 | 2880 |
| 50 | 7200 |
| 100 | 14400 |
| 200 | 28800 |
| 500 | 72000 |
| 1000 | 1.4400e+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 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 to pound-force per square foot?
Pressure conversions between psi and psf 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).