PSI to psf Converter
Enter the pressure in psi below to convert it to psf.
Convert PSI to psf
Enter a value in psi (psi) to convert to psf (psf).
Pounds per Square Inch to Pounds per Square Foot Conversion Table
Table showing various pounds per square inch measurements converted to psf. Click any preset value or arrow to load it into the converter.
How to Convert PSI to psf
To convert psi to psf, multiply the pressure by the following conversion ratio: 144 psf/pounds per square inch.
Since one pounds per square inch is equal to 144 psf, you can use this simple formula to convert:
The pressure in psf is equal to the pressure in psi multiplied by 144.
For example, here's how to convert 5 psi to psf using the formula above.
How Many psf Are in a Pounds per Square Inch?
There are 144 psf in a pounds per square inch, which is why we use this value in the formula above.
Our pounds per square inch to pounds per square foot calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
PSI and psf are both units used to measure pressure. Keep reading to learn more about each unit.
What Is a Pounds per Square Inch?
A pounds per square inch is a unit of pressure equal to 6,894.7572932 pascals (Pa), the base unit for pressure. Imperial & US pressure unit equal to 1 pound-force per square inch (6.89476 kPa). [1]
The pounds per square inch is classified as a US customary and imperial unit of pressure. PSI can be abbreviated as psi; for example, 1 pounds per square inch can be written as 1 psi.
When working with psi (psi) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, psi (psi) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Pounds per Square Foot?
A pounds per square foot is a unit of pressure equal to 47.880259 pascals (Pa), the base unit for pressure. Equal to 1/144 PSI (47.88 Pascals), used in aerodynamic and structural wind loading. [2]
The pounds per square foot is classified as a US customary and imperial unit of pressure. psf can be abbreviated as psf; for example, 1 pounds per square foot can be written as 1 psf.
When working with psf (psf) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, psf (psf) are widely used across standard pressure applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
When converting pressure between psi (psi) and psf (psf), keep full floating-point precision (1 psi = 144 psf; 1 psf = 0.0069444 psi) during intermediate calculations and round only the final pounds per square foot figure to match your instrument tolerance.
More Pounds per Square Inch & Pounds per Square Foot Conversions
Need to calculate in the opposite direction? Use our psf to psi calculator to switch your starting unit immediately. You can also explore related tools such as converting psf to psi, converting psi to bars, or converting psi to kilopascals.
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — PSI (psi) to psf (psf)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Pounds per Square Inch (psi) & Pounds per Square Foot (psf) (psf)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (psi to psf)