Operator math, worked
How to convert pressure and head (psi and feet)
Water height and pressure are two ways of saying the same thing. To turn feet of water into psi, multiply by 0.433. To turn psi into feet of head, multiply by 2.31.
Last reviewed 2026-08-04
The formula
psi = feet x 0.433 | feet = psi x 2.31
The steps
Feet to psi
Each foot of water makes about 0.433 psi, so multiply the height in feet by 0.433.
Psi to feet
Going the other way, multiply the psi by 2.31 to get feet of head.
Check the direction
Feet is always the bigger number and psi the smaller, because 0.433 is less than 1 and 2.31 is more than 1.
Worked example
How much pressure does 92 feet of water make?
- 92 x 0.433 = 39.8
Answer: About 39.8 psi
Common questions
- Which number turns feet into psi?
- 0.433. Multiply the feet by 0.433 to get psi.
- Which number turns psi into feet?
- 2.31. Multiply the psi by 2.31 to get feet of head.
- Are 0.433 and 2.31 related?
- Yes, they are opposites. One undoes the other, since 1 divided by 0.433 is about 2.31.