Convert psi to Centimeters of Water
1 psi equals 70.30695796 centimeters of water (cmH₂O).
1 psi = 70.30695796 cmH₂O
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk psi to centimeter of water converter to paste a column from Excel.
How to Convert psi to Centimeter of Water
- 1 psi = 70.30695796 cmH₂O
- 1 cmH₂O = 0.01422334331 psi
- Example: convert 15 psi to cmH₂O: 15 psi = 15 × 70.30695796 cmH₂O = 1054.604369 cmH₂O
Reference conditions. cmH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
cmH₂O = psi × 70.30695796392
Derivation from SI units:
- 1 psi = 1 lbf/in² = (0.45359237 kg × 9.80665 m/s²) ÷ (0.0254 m)² = 6894.757293168 Pa
- 1 cmH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.01 m = 98.0665 Pa
- 1 psi = 6894.757293168 Pa ÷ 98.0665 Pa per cmH₂O = 70.30695796392 cmH₂O
Both units are defined exactly, so the factor is exact. psi definition: psi; Centimeter of Water definition: centimeter of water.
Worked examples
- A reading of 14.7 psi converts to 1033.512282 cmH₂O.
14.7 psi × 70.30695796 = 1033.512282 cmH₂O - A value of 60 psi is 4218.417478 cmH₂O.
60 psi × 70.30695796 = 4218.417478 cmH₂O
psi to Centimeter of Water conversion table
| psi | Centimeters of Water (cmH₂O) |
|---|---|
| 0.01 psi | 0.7030695796 cmH₂O |
| 0.05 psi | 3.515347898 cmH₂O |
| 0.1 psi | 7.030695796 cmH₂O |
| 0.25 psi | 17.57673949 cmH₂O |
| 0.5 psi | 35.15347898 cmH₂O |
| 1 psi | 70.30695796 cmH₂O |
| 2 psi | 140.6139159 cmH₂O |
| 5 psi | 351.5347898 cmH₂O |
| 10 psi | 703.0695796 cmH₂O |
| 14.7 psi | 1033.512282 cmH₂O |
| 15 psi | 1054.604369 cmH₂O |
| 20 psi | 1406.139159 cmH₂O |
| 25 psi | 1757.673949 cmH₂O |
| 30 psi | 2109.208739 cmH₂O |
| 32 psi | 2249.822655 cmH₂O |
| 35 psi | 2460.743529 cmH₂O |
| 40 psi | 2812.278319 cmH₂O |
| 50 psi | 3515.347898 cmH₂O |
| 60 psi | 4218.417478 cmH₂O |
| 80 psi | 5624.556637 cmH₂O |
| 100 psi | 7030.695796 cmH₂O |
| 125 psi | 8788.369745 cmH₂O |
| 150 psi | 10546.04369 cmH₂O |
| 200 psi | 14061.39159 cmH₂O |
| 500 psi | 35153.47898 cmH₂O |
| 1000 psi | 70306.95796 cmH₂O |
| 3000 psi | 210920.8739 cmH₂O |
| 5000 psi | 351534.7898 cmH₂O |
Where it's used
psi are used for tyre pressure in the United States (about 30–35 psi for cars), while centimeters of water appear in mechanical ventilation (PEEP 5–10 cmH₂O, plateau pressure under 30 cmH₂O). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
psi to other pressure units
| Conversion | 1 psi equals |
|---|---|
| psi to pascal | 6894.757293 Pa |
| psi to kilopascal | 6.894757293 kPa |
| psi to megapascal | 0.006894757293 MPa |
| psi to bar | 0.06894757293 bar |
| psi to millibar | 68.94757293 mbar |
| psi to decibar | 0.6894757293 dbar |
| psi to torr | 51.71493257 Torr |
| psi to millimeter of mercury | 51.7149252 mmHg |
| psi to millimeter of water | 703.0695796 mmH₂O |
| psi to centimeter of water | 70.30695796 cmH₂O |
| psi to inch of water | 27.67990471 inH₂O |
| psi to inch of water (60 °F) | 27.7075924 inH₂O (60 °F) |
| psi to inch of mercury | 2.036020677 inHg |
| psi to atmosphere | 0.06804596391 atm |
| psi to barye | 68947.57293 Ba |
Frequently asked questions
How many centimeters of water are in 1 psi?
1 psi = 70.30695796 cmH₂O.
How do I convert psi to centimeters of water?
Multiply the value in psi by 70.30695796. For example, 15 psi × 70.30695796 = 1054.604369 cmH₂O.
Is the psi to cmH₂O conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "pound-force per square inch (psi)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "centimeter of water, conventional (cmH2O)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert psi to Centimeters of Water. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/psi-to-centimeter-of-water/
IEEE
Scientific Converters, "Convert psi to Centimeters of Water," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/psi-to-centimeter-of-water/