Convert Centimeters of Water to Pascals
1 centimeter of water (cmH₂O) equals 98.0665 pascals (Pa).
1 cmH₂O = 98.0665 Pa
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk centimeter of water to pascal converter to paste a column from Excel.
How to Convert Centimeter of Water to Pascal
- 1 cmH₂O = 98.0665 Pa
- 1 Pa = 0.01019716213 cmH₂O
- Example: convert 15 cmH₂O to Pa: 15 cmH₂O = 15 × 98.0665 Pa = 1470.9975 Pa
Reference conditions. cmH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
Pa = cmH₂O × 98.0665
Derivation from SI units:
- 1 cmH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.01 m = 98.0665 Pa
- 1 Pa = 1 N/m² = 1 kg·m⁻¹·s⁻²
Both units are defined exactly, so the factor is exact. Centimeter of Water definition: centimeter of water; Pascal definition: pascal.
Worked examples
- A PEEP setting of 5 cmH₂O is 490.3325 Pa.
5 cmH₂O × 98.0665 = 490.3325 Pa - A CPAP pressure of 20 cmH₂O equals 1961.33 Pa.
20 cmH₂O × 98.0665 = 1961.33 Pa
Centimeter of Water to Pascal conversion table
| Centimeters of Water (cmH₂O) | Pascals (Pa) |
|---|---|
| 0.5 cmH₂O | 49.03325 Pa |
| 1 cmH₂O | 98.0665 Pa |
| 2 cmH₂O | 196.133 Pa |
| 3 cmH₂O | 294.1995 Pa |
| 4 cmH₂O | 392.266 Pa |
| 5 cmH₂O | 490.3325 Pa |
| 6 cmH₂O | 588.399 Pa |
| 8 cmH₂O | 784.532 Pa |
| 10 cmH₂O | 980.665 Pa |
| 12 cmH₂O | 1176.798 Pa |
| 15 cmH₂O | 1470.9975 Pa |
| 20 cmH₂O | 1961.33 Pa |
| 25 cmH₂O | 2451.6625 Pa |
| 30 cmH₂O | 2941.995 Pa |
| 35 cmH₂O | 3432.3275 Pa |
| 40 cmH₂O | 3922.66 Pa |
| 50 cmH₂O | 4903.325 Pa |
| 60 cmH₂O | 5883.99 Pa |
| 80 cmH₂O | 7845.32 Pa |
| 100 cmH₂O | 9806.65 Pa |
Where it's used
Ventilator, anaesthesia and CPAP settings in cmH₂O are converted to pascals or kilopascals for device design, testing and published research.
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 Pa is 1 cmH₂O?
Exactly 98.0665 Pa for the conventional definition (1000 kg/m³ water, standard gravity).
How many pascals are in 1 centimeter of water?
1 cmH₂O = 98.0665 Pa.
How do I convert centimeters of water to pascals?
Multiply the value in cmH₂O by 98.0665. For example, 15 cmH₂O × 98.0665 = 1470.9975 Pa.
Is the cmH₂O to Pa conversion exact?
Yes. Both units are defined exactly, and 1 cmH₂O is exactly 98.0665 Pa.
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)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
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 Pascals. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/centimeter-of-water-to-pascal/
IEEE
Scientific Converters, "Convert Centimeters of Water to Pascals," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/centimeter-of-water-to-pascal/