Pressure
mmHgtombar
Convert millimetres of mercury (mmHg) to millibars (mbar).
Factor1 mmHg = 1.333224 mbar
Converter
mmHg
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mbar
Rendered to 6 significant figures.
Formula
Formula
mbar = mmHg × 1.333224
Multiply any value in millimetres of mercury by 1.333224 to obtain the value in millibars.
Worked example
Convert 760 mmHg to mbar.
- 01Start with 760 mmHg.
- 02Multiply by the conversion factor: 760 × 1.333224 = 1013.25 mbar.
Result760 mmHg = 1013.25 mbar
Conversion table
| mmHg | mbar |
|---|---|
| 1 | 1.3332 |
| 2 | 2.6664 |
| 5 | 6.6661 |
| 10 | 13.332 |
| 20 | 26.664 |
| 50 | 66.661 |
| 100 | 133.32 |
| 200 | 266.64 |
| 500 | 666.61 |
| 1000 | 1333.2 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from mmHg to mbar?
1 mmHg equals 1.333224 mbar. To convert, multiply the value in millimetres of mercury by 1.333224.
How do I convert 1 mmHg to mbar?
1 mmHg = 1.33322 mbar. For any value, multiply by 1.333224.
How do I convert mbar back to mmHg?
Divide by the same factor — or equivalently, multiply by 0.7500616. So 1 mbar = 0.750062 mmHg.
When would I need to convert millimetre of mercury to millibar?
Pressure conversions between mmHg 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).