Pressure
mmHgtohPa
Convert millimetres of mercury (mmHg) to hectopascals (hPa).
Factor1 mmHg = 1.333224 hPa
Converter
mmHg
Accepts numbers or expressions, e.g. 150 + 14.7
Result
hPa
Rendered to 6 significant figures.
Formula
Formula
hPa = mmHg × 1.333224
Multiply any value in millimetres of mercury by 1.333224 to obtain the value in hectopascals.
Worked example
Convert 760 mmHg to hPa.
- 01Start with 760 mmHg.
- 02Multiply by the conversion factor: 760 × 1.333224 = 1013.25 hPa.
Result760 mmHg = 1013.25 hPa
Conversion table
| mmHg | hPa |
|---|---|
| 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 hPa?
1 mmHg equals 1.333224 hPa. To convert, multiply the value in millimetres of mercury by 1.333224.
How do I convert 1 mmHg to hPa?
1 mmHg = 1.33322 hPa. For any value, multiply by 1.333224.
How do I convert hPa back to mmHg?
Divide by the same factor — or equivalently, multiply by 0.7500616. So 1 hPa = 0.750062 mmHg.
When would I need to convert millimetre of mercury to hectopascal?
Pressure conversions between mmHg and hPa 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).