Water Pressure to Head Height Calculator

A water pressure to head height calculator converts between PSI and feet of head, which is the equivalent elevation of water that produces the same pressure. It multiplies by 144 and divides by 62.4, the standard water density in lb per cubic foot. That gives about 2.31 ft of head per PSI. For 50 PSI, that's about 115.38 ft.

Last reviewed September 2026Method & sources Report an error

Head Height

115.38 ft

Breakdown
Head Height	115.38 ft
Pressure	50.00 PSI

How to Calculate Water Pressure to Head Height

Water pressure and elevation (head) are directly related. Pressure at the bottom of a column of water equals the water's weight per unit area above it. Start with standard water density, 62.4 lb per cubic foot at about 60°F. Then apply the conversion between square feet and square inches, 144 sq in per sq ft. Together they give exactly `144 ÷ 62.4 ≈ 2.31 ft` of water head per PSI. The calculator applies that same relationship in either direction, depending on which value you're converting from.

Example: Converting 50 PSI to feet of head

Converting 50 PSI to feet of head: Head height: 50 × 144 ÷ 62.4 ≈ 115.38 ft So 50 PSI at the base equals about 115.4 ft of water elevation above that point.

What Is Water Pressure to Head Height?

A water pressure to head height calculator converts between PSI and feet of head. PSI, pounds per square inch, is how plumbing and well systems commonly measure pressure. Feet of head is the equivalent elevation of water that would produce that same pressure. That's useful for well pump systems, irrigation design, and any situation where a pressure reading needs to be understood in terms of vertical lift or drop.

Water Pressure to Head Height: Pros and Cons

Pros

Uses the standard water density figure and an exact unit conversion, not a rounded rule of thumb
Works in both directions: PSI to head height, or head height to PSI
Useful across well systems, irrigation design, water tank placement, and fire protection system planning, wherever pressure and elevation need to be related

Cons

Assumes standard water density (62.4 lb/cu ft, roughly correct at common ambient temperatures). Water density does shift slightly with temperature, though not enough to matter for most practical plumbing and irrigation planning
Doesn't account for friction loss in pipe. This is a static, no-flow pressure-to-elevation relationship. The Water Velocity and Flow Rate calculators are the ones to check pipe sizing for a moving-water system
This is a straight physics conversion, not a system design tool. A well or irrigation system's actual required pressure depends on additional factors, like elevation change, pipe friction loss, and equipment requirements

Water Pressure to Head Height: What a Pro Checks

This is a static, no-flow conversion only. Check the Water Velocity or Flow Rate calculator separately for a system where water is actually moving, since this doesn't account for friction loss in pipe.
When sizing a well pump, count both the vertical lift from the water table to the point of use and whatever additional pressure your fixtures need at the top.

Frequently Asked Questions

How do you convert PSI to feet of head?

Multiply PSI by 144 (sq in per sq ft) and divide by 62.4 (standard water density in lb per cu ft). Or use the commonly rounded shortcut of multiplying PSI by about 2.31. 50 PSI converts to about 115.4 ft of head.

How do you convert feet of head to PSI?

Multiply feet of head by 62.4 and divide by 144. Or use the commonly rounded shortcut of dividing feet of head by about 2.31. 100 ft of head converts to about 43.3 PSI.

Why is 1 PSI equal to 2.31 feet of water?

It comes directly from water's density, 62.4 lb per cubic foot, and the unit conversion between square feet and square inches (144 sq in per sq ft). Dividing 144 by 62.4 gives exactly 2.3077, commonly rounded to 2.31.

Why does well water pressure matter for pump sizing?

A well pump needs to overcome both the vertical lift (head) from the water table to the point of use, plus any additional pressure needed at the fixtures. Converting between head height and PSI helps relate a pump's rated lift capacity to the pressure it needs to deliver.

Does water temperature affect this conversion?

Slightly. Water density decreases a bit as temperature rises. That technically shifts the exact PSI-to-head relationship, but the effect is small enough to ignore for typical plumbing, well, and irrigation planning at normal ambient temperatures.

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