Pressure
mH₂Otobar
Convert metres of water column (mH₂O) to bar (bar).
Factor1 mH₂O = 0.0980665 bar
Converter
mH₂O
Accepts numbers or expressions, e.g. 150 + 14.7
Result
bar
Rendered to 6 significant figures.
Formula
Formula
bar = mH₂O × 0.0980665
Multiply any value in metres of water column by 0.0980665 to obtain the value in bar.
Worked example
Convert 10 mH₂O to bar.
- 01Start with 10 mH₂O.
- 02Multiply by the conversion factor: 10 × 0.0980665 = 0.980665 bar.
Result10 mH₂O = 0.980665 bar
Conversion table
| mH₂O | bar |
|---|---|
| 1 | 0.098067 |
| 2 | 0.19613 |
| 5 | 0.49033 |
| 10 | 0.98067 |
| 20 | 1.9613 |
| 50 | 4.9033 |
| 100 | 9.8066 |
| 200 | 19.613 |
| 500 | 49.033 |
| 1000 | 98.067 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from mH₂O to bar?
1 mH₂O equals 0.0980665 bar. To convert, multiply the value in metres of water column by 0.0980665.
How do I convert 1 mH₂O to bar?
1 mH₂O = 0.0980665 bar. For any value, multiply by 0.0980665.
How do I convert bar back to mH₂O?
Divide by the same factor — or equivalently, multiply by 10.19716. So 1 bar = 10.1972 mH₂O.
When would I need to convert metre of water column to bar?
Pressure conversions between mH₂O 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).