Convert Pound per Square Foot to Pound per Square Inch
Convert psf to psi by entering a value below.
How to Convert PSF to PSI
The pound per square foot and pound per square inch are both units of pressure. 1 pound per square inch equals 144 psf. This means to convert psf to psi, you divide by 144.
Formula
Step-by-Step Example
Convert 5 psf to psi:
We need to convert psf to psi
Since 1 psi = 144 psf, divide by 144
5 ÷ 144 = 0.0347222222
5 psf = 0.0347222222 psi
Pound per Square Foot to Pound per Square Inch Conversion Table
Quick reference table for common pound per square foot to pound per square inch conversions. Click any value for detailed calculation.
| PSF (psf) | PSI (psi) |
|---|---|
| 0.1 psf | 0.0006944444 psi |
| 0.5 psf | 0.0034722222 psi |
| 1 psf | 0.0069444444 psi |
| 2 psf | 0.0138888889 psi |
| 5 psf | 0.0347222222 psi |
| 10 psf | 0.0694444444 psi |
| 25 psf | 0.1736111111 psi |
| 50 psf | 0.3472222222 psi |
| 100 psf | 0.6944444444 psi |
About These Units
Pound per Square Foot (psf)
Pounds per square foot (psf or lbf/ft²) measures structural loads, wind pressure, and floor loading in US construction. Building codes specify floor loads in psf (residential: 40 psf, commercial: 50-100 psf). One psf equals approximately 47.88 Pascals.
Pound per Square Inch (psi)
Pounds per square inch (PSI or lbf/in²) is the standard pressure unit in the United States. PSI measures tire pressure (30-35 PSI for cars), air compressors, water pressure, and HVAC systems. One PSI equals approximately 6.895 kPa or 0.0689 bar.
Frequently Asked Questions
How do I convert psf to psi?
To convert psf to psi, divide the value by 144. For example, 10 psf = 0.0694444444 psi.
How many psi are in 1 pound per square foot?
1 pound per square foot equals 0.0069444444 psi.
What is the formula for psf to psi?
The formula is: psi = psf ÷ 144.