PSI to Inches of Water Converter (psi to inH₂O)

How to convert pounds per square inch to inches of water

FormulainH₂O = psi × 27.67990471

Multiply the value in pounds per square inch by 27.67990471. To go the other way, multiply by 0.036127292 (or divide by 27.67990471).

A pound per square inch is larger than an inch of water: one pound per square inch contains 27.67990471 inches of water.

Worked examples

1 pound per square inch1 psi × 27.67990471 = 27.67990471 inH₂O
5 pounds per square inch5 psi × 27.67990471 = 138.3995236 inH₂O
10 pounds per square inch10 psi × 27.67990471 = 276.7990471 inH₂O
20 pounds per square inch20 psi × 27.67990471 = 553.5980942 inH₂O
100 pounds per square inch100 psi × 27.67990471 = 2,767.990471 inH₂O

Pounds per square inch to inches of water conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Pounds per square inch to inches of water: 0.1–10 psi
Pounds per square inch (psi)	Inches of water (inH₂O)
0.1 psi	2.7679905 inH₂O
0.25 psi	6.9199762 inH₂O
0.5 psi	13.839952 inH₂O
1 psi	27.679905 inH₂O
2 psi	55.359809 inH₂O
3 psi	83.039714 inH₂O
4 psi	110.71962 inH₂O
5 psi	138.39952 inH₂O
6 psi	166.07943 inH₂O
7 psi	193.75933 inH₂O
8 psi	221.43924 inH₂O
9 psi	249.11914 inH₂O
10 psi	276.79905 inH₂O

Pounds per square inch to inches of water: 12–1,000 psi
Pounds per square inch (psi)	Inches of water (inH₂O)
12 psi	332.15886 inH₂O
15 psi	415.19857 inH₂O
20 psi	553.59809 inH₂O
25 psi	691.99762 inH₂O
30 psi	830.39714 inH₂O
40 psi	1,107.1962 inH₂O
50 psi	1,383.9952 inH₂O
75 psi	2,075.9929 inH₂O
100 psi	2,767.9905 inH₂O
250 psi	6,919.9762 inH₂O
500 psi	13,839.952 inH₂O
1,000 psi	27,679.905 inH₂O

About the units

Pound per square inch (psi)

One pound-force per square inch, about 6,894.76 Pa. US tire, air-compressor and hydraulic pressures are given in psi. One pound per square inch equals 6,894.757293 pascals (Pa).

Inch of water (inH₂O)

Conventional value 249.08891 Pa. HVAC duct static pressure and gas-appliance pressures use inches of water column.

Frequently asked questions

How many inches of water are in one pound per square inch?

There are 27.67990471 inches of water in one pound per square inch, and this value is exact by definition.

How do I convert pounds per square inch to inches of water?

Multiply the number of pounds per square inch by 27.67990471. For example, 10 psi × 27.67990471 = 276.7990471 inH₂O.

How many pounds per square inch are in one inch of water?

One inch of water equals 0.036127292 pounds per square inch. That is the reverse factor, 1 ÷ 27.67990471.

What is 10 pounds per square inch in inches of water?

10 psi = 276.7990471 inH₂O.

Is this psi to inH₂O converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

PSI to Inches of Water Converter