Pressure
cmH₂Otobar
Convert centimetres of water column (cmH₂O) to bar (bar).
Factor1 cmH₂O = 0.000980665 bar
Converter
cmH₂O
Accepts numbers or expressions, e.g. 150 + 14.7
Result
bar
Rendered to 6 significant figures.
Formula
Formula
bar = cmH₂O × 0.000980665
Multiply any value in centimetres of water column by 0.000980665 to obtain the value in bar.
Worked example
Convert 1000 cmH₂O to bar.
- 01Start with 1000 cmH₂O.
- 02Multiply by the conversion factor: 1000 × 0.000980665 = 0.980665 bar.
Result1000 cmH₂O = 0.980665 bar
Conversion table
| cmH₂O | bar |
|---|---|
| 1 | 0.00098067 |
| 2 | 0.0019613 |
| 5 | 0.0049033 |
| 10 | 0.0098067 |
| 20 | 0.019613 |
| 50 | 0.049033 |
| 100 | 0.098067 |
| 200 | 0.19613 |
| 500 | 0.49033 |
| 1000 | 0.98067 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from cmH₂O to bar?
1 cmH₂O equals 0.000980665 bar. To convert, multiply the value in centimetres of water column by 0.000980665.
How do I convert 1 cmH₂O to bar?
1 cmH₂O = 0.000980665 bar. For any value, multiply by 0.000980665.
How do I convert bar back to cmH₂O?
Divide by the same factor — or equivalently, multiply by 1019.716. So 1 bar = 1019.72 cmH₂O.
When would I need to convert centimetre of water column to bar?
Pressure conversions between cmH₂O and bar 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).