Pressure
inHgtopsi
Convert inches of mercury (0 °C) (inHg) to pounds-force per square inch (psi).
Factor1 inHg = 0.4911542 psi
Converter
inHg
Accepts numbers or expressions, e.g. 150 + 14.7
Result
psi
Rendered to 6 significant figures.
Formula
Formula
psi = inHg × 0.4911542
Multiply any value in inches of mercury (0 °C) by 0.4911542 to obtain the value in pounds-force per square inch.
Worked example
Convert 30 inHg to psi.
- 01Start with 30 inHg.
- 02Multiply by the conversion factor: 30 × 0.4911542 = 14.7346 psi.
Result30 inHg = 14.7346 psi
Conversion table
| inHg | psi |
|---|---|
| 1 | 0.49115 |
| 2 | 0.98231 |
| 5 | 2.4558 |
| 10 | 4.9115 |
| 20 | 9.8231 |
| 50 | 24.558 |
| 100 | 49.115 |
| 200 | 98.231 |
| 500 | 245.58 |
| 1000 | 491.15 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from inHg to psi?
1 inHg equals 0.4911542 psi. To convert, multiply the value in inches of mercury (0 °C) by 0.4911542.
How do I convert 1 inHg to psi?
1 inHg = 0.491154 psi. For any value, multiply by 0.4911542.
How do I convert psi back to inHg?
Divide by the same factor — or equivalently, multiply by 2.03602. So 1 psi = 2.03602 inHg.
When would I need to convert inch of mercury (0 °C) to pound-force per square inch?
Pressure conversions between inHg and psi 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).