Convert Centimeters of Water to psi
1 centimeter of water (cmH₂O) equals 0.01422334331 psi.
1 cmH₂O = 0.01422334331 psi
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk centimeter of water to psi converter to paste a column from Excel.
How to Convert Centimeter of Water to psi
- 1 cmH₂O = 0.01422334331 psi
- 1 psi = 70.30695796 cmH₂O
- Example: convert 15 cmH₂O to psi: 15 cmH₂O = 15 × 0.01422334331 psi = 0.2133501496 psi
Reference conditions. cmH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
psi = cmH₂O × 0.01422334330712
or psi = cmH₂O ÷ 70.30695796392
Derivation from SI units:
- 1 cmH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.01 m = 98.0665 Pa
- 1 psi = 1 lbf/in² = (0.45359237 kg × 9.80665 m/s²) ÷ (0.0254 m)² = 6894.757293168 Pa
- 1 cmH₂O = 98.0665 Pa ÷ 6894.757293168 Pa per psi = 0.01422334330712 psi
Both units are defined exactly, so the factor is exact. Centimeter of Water definition: centimeter of water; psi definition: psi.
Worked examples
- A reading of 6 cmH₂O converts to 0.08534005984 psi.
6 cmH₂O × 0.01422334331 = 0.08534005984 psi - A value of 30 cmH₂O is 0.4267002992 psi.
30 cmH₂O × 0.01422334331 = 0.4267002992 psi
Centimeter of Water to psi conversion table
| Centimeters of Water (cmH₂O) | psi |
|---|---|
| 0.5 cmH₂O | 0.007111671654 psi |
| 1 cmH₂O | 0.01422334331 psi |
| 2 cmH₂O | 0.02844668661 psi |
| 3 cmH₂O | 0.04267002992 psi |
| 4 cmH₂O | 0.05689337323 psi |
| 5 cmH₂O | 0.07111671654 psi |
| 6 cmH₂O | 0.08534005984 psi |
| 8 cmH₂O | 0.1137867465 psi |
| 10 cmH₂O | 0.1422334331 psi |
| 12 cmH₂O | 0.1706801197 psi |
| 15 cmH₂O | 0.2133501496 psi |
| 20 cmH₂O | 0.2844668661 psi |
| 25 cmH₂O | 0.3555835827 psi |
| 30 cmH₂O | 0.4267002992 psi |
| 35 cmH₂O | 0.4978170157 psi |
| 40 cmH₂O | 0.5689337323 psi |
| 50 cmH₂O | 0.7111671654 psi |
| 60 cmH₂O | 0.8534005984 psi |
| 80 cmH₂O | 1.137867465 psi |
| 100 cmH₂O | 1.422334331 psi |
Where it's used
Centimeters of Water are used for mechanical ventilation (PEEP 5–10 cmH₂O, plateau pressure under 30 cmH₂O), while psi appear in tyre pressure in the United States (about 30–35 psi for cars). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Centimeter of Water to other pressure units
| Conversion | 1 cmH₂O equals |
|---|---|
| centimeter of water to pascal | 98.0665 Pa |
| centimeter of water to kilopascal | 0.0980665 kPa |
| centimeter of water to megapascal | 0.0000980665 MPa |
| centimeter of water to psi | 0.01422334331 psi |
| centimeter of water to bar | 0.000980665 bar |
| centimeter of water to millibar | 0.980665 mbar |
| centimeter of water to decibar | 0.00980665 dbar |
| centimeter of water to torr | 0.7355592401 Torr |
| centimeter of water to millimeter of mercury | 0.7355591353 mmHg |
| centimeter of water to millimeter of water | 10 mmH₂O |
| centimeter of water to inch of water | 0.3937007874 inH₂O |
| centimeter of water to inch of water (60 °F) | 0.3940945989 inH₂O (60 °F) |
| centimeter of water to inch of mercury | 0.02895902107 inHg |
| centimeter of water to atmosphere | 0.0009678411054 atm |
| centimeter of water to barye | 980.665 Ba |
Frequently asked questions
How many psi are in 1 centimeter of water?
1 cmH₂O = 0.01422334331 psi.
How do I convert centimeters of water to psi?
Multiply the value in cmH₂O by 0.01422334331, or divide it by 70.30695796. For example, 15 cmH₂O × 0.01422334331 = 0.2133501496 psi.
Is the cmH₂O to psi 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, "centimeter of water, conventional (cmH2O)".
- 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)".
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 Centimeters of Water to psi. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/centimeter-of-water-to-psi/
IEEE
Scientific Converters, "Convert Centimeters of Water to psi," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/centimeter-of-water-to-psi/