Pounds per Square Inch to Inches of Water (psi → inH₂O)
Formula
1 psi = 27.68067142547434 inH₂OConversion Table
| psi | inH₂O |
|---|---|
| 0 | 0 |
| 1.0000 | 27.681 |
| 2.0000 | 55.361 |
| 3.0000 | 83.042 |
| 4.0000 | 110.72 |
| 5.0000 | 138.40 |
| 6.0000 | 166.08 |
| 7.0000 | 193.76 |
| 8.0000 | 221.45 |
| 9.0000 | 249.13 |
| 10.000 | 276.81 |
| 11.000 | 304.49 |
| 12.000 | 332.17 |
| 13.000 | 359.85 |
| 14.000 | 387.53 |
| 15.000 | 415.21 |
| 16.000 | 442.89 |
| 17.000 | 470.57 |
| 18.000 | 498.25 |
| 19.000 | 525.93 |
| psi | inH₂O |
|---|---|
| 20.000 | 553.61 |
| 21.000 | 581.29 |
| 22.000 | 608.97 |
| 23.000 | 636.66 |
| 24.000 | 664.34 |
| 25.000 | 692.02 |
| 26.000 | 719.70 |
| 27.000 | 747.38 |
| 28.000 | 775.06 |
| 29.000 | 802.74 |
| 30.000 | 830.42 |
| 31.000 | 858.10 |
| 32.000 | 885.78 |
| 33.000 | 913.46 |
| 34.000 | 941.14 |
| 35.000 | 968.82 |
| 36.000 | 996.50 |
| 37.000 | 1,024.2 |
| 38.000 | 1,051.9 |
| 39.000 | 1,079.5 |
| psi | inH₂O |
|---|---|
| 40.000 | 1,107.2 |
| 41.000 | 1,134.9 |
| 42.000 | 1,162.6 |
| 43.000 | 1,190.3 |
| 44.000 | 1,217.9 |
| 45.000 | 1,245.6 |
| 46.000 | 1,273.3 |
| 47.000 | 1,301.0 |
| 48.000 | 1,328.7 |
| 49.000 | 1,356.4 |
| 50.000 | 1,384.0 |
| 51.000 | 1,411.7 |
| 52.000 | 1,439.4 |
| 53.000 | 1,467.1 |
| 54.000 | 1,494.8 |
| 55.000 | 1,522.4 |
| 56.000 | 1,550.1 |
| 57.000 | 1,577.8 |
| 58.000 | 1,605.5 |
| 59.000 | 1,633.2 |
| psi | inH₂O |
|---|---|
| 60.000 | 1,660.8 |
| 61.000 | 1,688.5 |
| 62.000 | 1,716.2 |
| 63.000 | 1,743.9 |
| 64.000 | 1,771.6 |
| 65.000 | 1,799.2 |
| 66.000 | 1,826.9 |
| 67.000 | 1,854.6 |
| 68.000 | 1,882.3 |
| 69.000 | 1,910.0 |
| 70.000 | 1,937.6 |
| 71.000 | 1,965.3 |
| 72.000 | 1,993.0 |
| 73.000 | 2,020.7 |
| 74.000 | 2,048.4 |
| 75.000 | 2,076.1 |
| 76.000 | 2,103.7 |
| 77.000 | 2,131.4 |
| 78.000 | 2,159.1 |
| 79.000 | 2,186.8 |
Pounds per Square Inch to Inches of Water Conversion
Converting Pounds per Square Inch (psi) to Inches of Water (inH₂O) is a common pressure conversion. 1 psi equals 27.680671 inH₂O. For example, 100 psi is equal to 2,768.067143 inH₂O.
Quick Reference Values
1 psi = 27.680671 inH₂O. 5 psi = 138.403357 inH₂O. 10 psi = 276.806714 inH₂O. 25 psi = 692.016786 inH₂O. 50 psi = 1,384.033571 inH₂O. 100 psi = 2,768.067143 inH₂O.
What is Pounds per Square Inch?
Pounds per Square Inch (psi) is a unit of pressure. Pounds per square inch (psi) measures pressure as force in pounds applied over one square inch of area. It is defined as 1 psi = 6,894.76 pascals in the SI unit system [nist-si-guide]. Psi originated in English-speaking countries for engineering and industrial applications during the 19th century, formalized through American standards for pressure measurement [nist-si-guide]. Psi remains common in the United States, Canada, and the UK for tire pressure, hydraulic systems, and HVAC industries. It is also referenced in international engineering standards [nist-sp-811].
What is Inches of Water?
Inches of Water (inH₂O) is a unit of pressure. Inches of water measure pressure as the height in inches of a water column. One inch of water equals 249.0889 pascals (Pa) at 4 °C. This unit is widely used to measure low-pressure differentials in HVAC and fluid systems [nist-si-guide]. The use of water columns for pressure measurement dates to early fluid mechanics studies. The inch unit was adopted in English-speaking countries for practical low-pressure measurement. It remains standardized for building and industrial applications [nist-si-guide]. Inches of water are used primarily in the United States for HVAC duct pressures, gas pressure measurements, and cleanroom environments. Other countries often use pascals or millimeters of water but recognize inH2O in specific sectors [nist-si-guide].
Common Misspellings
People often search for this conversion using these alternate spellings: pounds per square inch, pound per sq inch, psiin, inch of water, inch-water, in h2o, inch h20. All of these refer to the Pounds per Square Inch to Inches of Water conversion.