Centimeters of Water to Hectopascals Converter

cmH₂O → hPa: type a value and the result appears instantly.

1 cmH₂O = 0.980665 hPa
1 hPa = 1.019716213 cmH₂O

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How to convert centimeters of water to hectopascals

Use this formula:

hPa = cmH₂O × 0.980665

Examples

5 cmH₂O = 4.90333 hPa
12 cmH₂O = 11.768 hPa
100 cmH₂O = 98.0665 hPa

cmH₂O to hPa conversion chart

centimeters of water (cmH₂O)	hectopascals (hPa)
0.1 cmH₂O	0.0980665 hPa
0.25 cmH₂O	0.245166 hPa
0.5 cmH₂O	0.490333 hPa
1 cmH₂O	0.980665 hPa
2 cmH₂O	1.96133 hPa
3 cmH₂O	2.94199 hPa
4 cmH₂O	3.92266 hPa
5 cmH₂O	4.90333 hPa
6 cmH₂O	5.88399 hPa
7 cmH₂O	6.86465 hPa
8 cmH₂O	7.84532 hPa
9 cmH₂O	8.82599 hPa
10 cmH₂O	9.80665 hPa
12 cmH₂O	11.768 hPa
15 cmH₂O	14.71 hPa
20 cmH₂O	19.6133 hPa
25 cmH₂O	24.5166 hPa
30 cmH₂O	29.42 hPa
40 cmH₂O	39.2266 hPa
50 cmH₂O	49.0332 hPa
60 cmH₂O	58.8399 hPa
70 cmH₂O	68.6466 hPa
75 cmH₂O	73.5499 hPa
80 cmH₂O	78.4532 hPa
90 cmH₂O	88.2599 hPa
100 cmH₂O	98.0665 hPa
150 cmH₂O	147.1 hPa
200 cmH₂O	196.133 hPa
250 cmH₂O	245.166 hPa
500 cmH₂O	490.332 hPa
1,000 cmH₂O	980.665 hPa

About the units

Centimeter of water (cmH₂O) is a commonly used unit. 1 cmH₂O = 98.0665 Pa.

Hectopascal (hPa) is a metric (SI) unit. 1 hPa = 100 Pa.

Frequently asked questions

How do I convert centimeters of water to hectopascals?: Multiply the value in cmH₂O by 0.980665.
How many hectopascals are in 1 centimeter of water?: 1 cmH₂O = 0.980665 hPa.
What is 12 cmH₂O in hPa?: 12 cmH₂O = 11.768 hPa.
How do I convert hectopascals to centimeters of water?: Use the reverse converter: hPa → cmH₂O.

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Related conversions

hPa → cmH₂O psi → bar bar → psi kPa → psi psi → kPa hPa → inHg inHg → hPa hPa → mbar mbar → hPa kgf/cm² → bar bar → kgf/cm² kgf/cm² → psi psi → kgf/cm² Torr → Pa

Sources: NIST SP 811 · BIPM SI Brochure · NIST Handbook 44. Last reviewed: 2026-10 · FreeUnitConverters