Pressure
inHgtombar
Convert inches of mercury (0 °C) (inHg) to millibars (mbar).
Factor1 inHg = 33.86389 mbar
Converter
inHg
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mbar
Rendered to 6 significant figures.
Formula
Formula
mbar = inHg × 33.86389
Multiply any value in inches of mercury (0 °C) by 33.86389 to obtain the value in millibars.
Worked example
Convert 30 inHg to mbar.
- 01Start with 30 inHg.
- 02Multiply by the conversion factor: 30 × 33.86389 = 1015.92 mbar.
Result30 inHg = 1015.92 mbar
Conversion table
| inHg | mbar |
|---|---|
| 1 | 33.864 |
| 2 | 67.728 |
| 5 | 169.32 |
| 10 | 338.64 |
| 20 | 677.28 |
| 50 | 1693.2 |
| 100 | 3386.4 |
| 200 | 6772.8 |
| 500 | 16932 |
| 1000 | 33864 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from inHg to mbar?
1 inHg equals 33.86389 mbar. To convert, multiply the value in inches of mercury (0 °C) by 33.86389.
How do I convert 1 inHg to mbar?
1 inHg = 33.8639 mbar. For any value, multiply by 33.86389.
How do I convert mbar back to inHg?
Divide by the same factor — or equivalently, multiply by 0.02952998. So 1 mbar = 0.02953 inHg.
When would I need to convert inch of mercury (0 °C) to millibar?
Pressure conversions between inHg 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).