Direct conversion
Convert pound per square inch [psi] to millimeter of mercury [mmHg] instantly with formula, examples, chart, and FAQs.
Quick answer
Use the calculator below for any custom value, then check the formula, examples, chart, and reverse conversion links.
1 pound per square inch [psi] = 51.714925 millimeter of mercury [mmHg]
1 pound per square inch [psi] = 51.714925 millimeter of mercury [mmHg]
Example: 1 pound per square inch [psi] equals 51.714925 millimeter of mercury [mmHg].
Pressure conversions use pascal as the reference unit and include common engineering, weather, tire, and laboratory pressure units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
Pound per square inch is a pressure unit showing pounds-force applied over one square inch.
HistoryPSI comes from imperial force and area units and remains common in mechanical and pressure-gauge contexts.
Current usePSI is used for tire pressure, compressors, plumbing, hydraulics, gas cylinders, and equipment ratings.
The millimeter of mercury (mmHg) is a pressure unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse millimeter of mercury when comparing pressure values, checking specifications, converting between systems, or preparing quick estimates.
| pound per square inch [psi] | millimeter of mercury [mmHg] |
|---|---|
| 1 | 51.714925 |
| 2 | 103.42985 |
| 5 | 258.574626 |
| 10 | 517.149252 |
| 20 | 1034.298504 |
| 25 | 1292.87313 |
| 50 | 2585.74626 |
| 100 | 5171.49252 |
| 1000 | 51714.925204 |
Use this formula: 1 pound per square inch [psi] = 51.714925 millimeter of mercury [mmHg] Enter your value in the calculator and the result updates instantly.
1 pound per square inch [psi] equals 51.714925 millimeter of mercury [mmHg].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.