Convert psi to psf (1 psi = 144 psf) or psf to psi, with the same pressure in ksf, Pa and kPa and a chart of common psi to psf values.
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PSI to PSF Formula
The following formula is used to calculate PSF from PSI.
- Where PSF is pounds-force per square foot (lbf/ft²)
- PSI is pounds-force per square inch (lbf/in²)
To calculate PSF from PSI, multiply the PSI by 144.
| Pounds per Square Inch (psi) | Pounds per Square Foot (psf) |
|---|---|
| 0.25 | 36.000 |
| 0.50 | 72.000 |
| 1 | 144.000 |
| 2 | 288.000 |
| 5 | 720.000 |
| 10 | 1,440.000 |
| 12 | 1,728.000 |
| 15 | 2,160.000 |
| 20 | 2,880.000 |
| 25 | 3,600.000 |
| 30 | 4,320.000 |
| 40 | 5,760.000 |
| 50 | 7,200.000 |
| 60 | 8,640.000 |
| 75 | 10,800.000 |
| 100 | 14,400.000 |
| 125 | 18,000.000 |
| 150 | 21,600.000 |
| 200 | 28,800.000 |
| 300 | 43,200.000 |
| * Rounded to 3 decimals. Conversion: 1 psi = 144 psf. | |
How is PSI converted to PSF?
Both pressure units use pound-force. Since one square foot contains 144 square inches, the same pressure has a PSF value 144 times its PSI value. The pressure reference is unchanged.
There are 144 square inches in a square foot, so to calculate PSF from PSI, simply multiply PSI by 144.
How to calculate PSF from PSI?
Example Problem:
The following example outlines how to convert PSI to PSF.
First, determine the pounds per square inch. In this example, the total pounds are given as 100 and the total square inches are given as 50. The pounds per square inch are then calculated by dividing the pounds by the area.
100 / 50 = 2 lbs/in2
Finally, convert the PSI to PSF using the formula above:
PSF = PSI *144
PSF = 2 * 144
PSF = 288 lbs/ft2
