Feet of Head to PSI Converter
Pressure at the bottom of a liquid column depends on the height of the column and the density of the liquid. For water (SG=1.0), each foot of head produces 0.433 PSI. For denser...
Formula
Source: Engineering Toolbox, Hydraulic Institute Standards | Last reviewed: June 7, 2026
Examples
100 ft
= 43.3 psi
- SG = 1
100 ft of water
100 ft
= 34.6 psi
- SG = 0.8
100 ft of kerosene (SG 0.8)
231 ft
= 100 psi
- SG = 1
231 ft of water = 100 psi
Quick Reference Table
| ft head | psi |
|---|---|
| 10 | 4.33 |
| 20 | 8.66 |
| 50 | 21.65 |
| 100 | 43.3 |
| 200 | 86.6 |
| 500 | 216.5 |
Where is this used?
Sizing pressure gauges at pump discharge.
Determining the discharge pressure of a pump given its head rating and the fluid being pumped.
Frequently Asked Questions
Where does the 0.433 factor come from?
0.433 = 62.4 lb/ft³ (water density) ÷ 144 (in²/ft²). It is the pressure exerted by a 1-ft column of water at 4°C.
Does temperature affect the conversion?
Yes, slightly. Water density changes with temperature: at 200°F, water density is about 60.1 lb/ft³, so the factor drops to 0.417. For most applications, 0.433 is sufficient.
How do I convert meters of head to psi?
First convert meters to feet (multiply by 3.281), then use the formula above. For water, psi = meters × 1.42.
Reviewed for accuracy
· Last reviewed: June 7, 2026
All calculations are for reference only. Always verify with manufacturer data and a qualified engineer for critical applications. Learn about our editorial process.