Pressure
psitommHg
Convert pounds-force per square inch (psi) to millimetres of mercury (mmHg).
Factor1 psi = 51.71493 mmHg
Converter
psi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mmHg
Rendered to 6 significant figures.
Formula
Formula
mmHg = psi × 51.71493
Multiply any value in pounds-force per square inch by 51.71493 to obtain the value in millimetres of mercury.
Worked example
Convert 14.6959 psi to mmHg.
- 01Start with 14.6959 psi.
- 02Multiply by the conversion factor: 14.6959 × 51.71493 = 759.997 mmHg.
Result14.6959 psi = 759.997 mmHg
Conversion table
| psi | mmHg |
|---|---|
| 1 | 51.715 |
| 2 | 103.43 |
| 5 | 258.57 |
| 10 | 517.15 |
| 20 | 1034.3 |
| 50 | 2585.7 |
| 100 | 5171.5 |
| 200 | 10343 |
| 500 | 25857 |
| 1000 | 51715 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from psi to mmHg?
1 psi equals 51.71493 mmHg. To convert, multiply the value in pounds-force per square inch by 51.71493.
How do I convert 1 psi to mmHg?
1 psi = 51.7149 mmHg. For any value, multiply by 51.71493.
How do I convert mmHg back to psi?
Divide by the same factor — or equivalently, multiply by 0.01933678. So 1 mmHg = 0.0193368 psi.
When would I need to convert pound-force per square inch to millimetre of mercury?
Pressure conversions between psi and mmHg 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).