Pressure
inHgtoMPa
Convert inches of mercury (0 °C) (inHg) to megapascals (MPa).
Factor1 inHg = 0.003386389 MPa
Converter
inHg
Accepts numbers or expressions, e.g. 150 + 14.7
Result
MPa
Rendered to 6 significant figures.
Formula
Formula
MPa = inHg × 0.003386389
Multiply any value in inches of mercury (0 °C) by 0.003386389 to obtain the value in megapascals.
Worked example
Convert 300 inHg to MPa.
- 01Start with 300 inHg.
- 02Multiply by the conversion factor: 300 × 0.003386389 = 1.01592 MPa.
Result300 inHg = 1.01592 MPa
Conversion table
| inHg | MPa |
|---|---|
| 1 | 0.0033864 |
| 2 | 0.0067728 |
| 5 | 0.016932 |
| 10 | 0.033864 |
| 20 | 0.067728 |
| 50 | 0.16932 |
| 100 | 0.33864 |
| 200 | 0.67728 |
| 500 | 1.6932 |
| 1000 | 3.3864 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from inHg to MPa?
1 inHg equals 0.003386389 MPa. To convert, multiply the value in inches of mercury (0 °C) by 0.003386389.
How do I convert 1 inHg to MPa?
1 inHg = 0.00338639 MPa. For any value, multiply by 0.003386389.
How do I convert MPa back to inHg?
Divide by the same factor — or equivalently, multiply by 295.2998. So 1 MPa = 295.3 inHg.
When would I need to convert inch of mercury (0 °C) to megapascal?
Pressure conversions between inHg and MPa 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).