Pressure
mH₂Otombar
Convert metres of water column (mH₂O) to millibars (mbar).
Factor1 mH₂O = 98.0665 mbar
Converter
mH₂O
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mbar
Rendered to 6 significant figures.
Formula
Formula
mbar = mH₂O × 98.0665
Multiply any value in metres of water column by 98.0665 to obtain the value in millibars.
Worked example
Convert 1 mH₂O to mbar.
- 01Start with 1 mH₂O.
- 02Multiply by the conversion factor: 1 × 98.0665 = 98.0665 mbar.
Result1 mH₂O = 98.0665 mbar
Conversion table
| mH₂O | mbar |
|---|---|
| 1 | 98.066 |
| 2 | 196.13 |
| 5 | 490.33 |
| 10 | 980.66 |
| 20 | 1961.3 |
| 50 | 4903.3 |
| 100 | 9806.6 |
| 200 | 19613 |
| 500 | 49033 |
| 1000 | 98067 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from mH₂O to mbar?
1 mH₂O equals 98.0665 mbar. To convert, multiply the value in metres of water column by 98.0665.
How do I convert 1 mH₂O to mbar?
1 mH₂O = 98.0665 mbar. For any value, multiply by 98.0665.
How do I convert mbar back to mH₂O?
Divide by the same factor — or equivalently, multiply by 0.01019716. So 1 mbar = 0.0101972 mH₂O.
When would I need to convert metre of water column to millibar?
Pressure conversions between mH₂O and mbar 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).