Pressure
hPatocmH₂O
Convert hectopascals (hPa) to centimetres of water column (cmH₂O).
Factor1 hPa = 1.019716 cmH₂O
Converter
hPa
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cmH₂O
Rendered to 6 significant figures.
Formula
Formula
cmH₂O = hPa × 1.019716
Multiply any value in hectopascals by 1.019716 to obtain the value in centimetres of water column.
Worked example
Convert 10 hPa to cmH₂O.
- 01Start with 10 hPa.
- 02Multiply by the conversion factor: 10 × 1.019716 = 10.1972 cmH₂O.
Result10 hPa = 10.1972 cmH₂O
Conversion table
| hPa | cmH₂O |
|---|---|
| 1 | 1.0197 |
| 2 | 2.0394 |
| 5 | 5.0986 |
| 10 | 10.197 |
| 20 | 20.394 |
| 50 | 50.986 |
| 100 | 101.97 |
| 200 | 203.94 |
| 500 | 509.86 |
| 1000 | 1019.7 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from hPa to cmH₂O?
1 hPa equals 1.019716 cmH₂O. To convert, multiply the value in hectopascals by 1.019716.
How do I convert 1 hPa to cmH₂O?
1 hPa = 1.01972 cmH₂O. For any value, multiply by 1.019716.
How do I convert cmH₂O back to hPa?
Divide by the same factor — or equivalently, multiply by 0.980665. So 1 cmH₂O = 0.980665 hPa.
When would I need to convert hectopascal to centimetre of water column?
Pressure conversions between hPa and cmH₂O are common when working with mixed-vendor instrumentation, when piping codes use different units to process datasheets, or when converting field readings into SI for hydraulic calculations.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).