1 psi = 51.7149 mmHg
1 pound per square inch equals 51.7149 millimeters of mercury. To convert pounds per square inch to millimeters of mercury, multiply the pound per square inch value by 51.7149. For quick reference: 1 psi = 51.7149 mmHg, 5 psi = 258.575 mmHg, 10 psi = 517.149 mmHg, 100 psi = 5171.49 mmHg.
Millimeters of mercury = Pounds per square inch × 51.7149Start with your value in pounds per square inch.
Multiply the pound per square inch value by 51.7149. This is the exact conversion factor from pounds per square inch to millimeters of mercury.
The product is your value in millimeters of mercury. For example, 5 psi × 51.7149 = 258.575 mmHg.
The exact factor from pounds per square inch to millimeters of mercury is 51.7149.
Millimeters of mercury = Pounds per square inch × 51.7149
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Pounds per square inch (psi) | Millimeters of mercury (mmHg) |
|---|---|
| 0.001 psi | 0.051715 mmHg |
| 0.01 psi | 0.51715 mmHg |
| 0.1 psi | 5.1715 mmHg |
| 0.5 psi | 25.857 mmHg |
| 1 psi | 51.715 mmHg |
| 1.5 psi | 77.572 mmHg |
| 2 psi | 103.43 mmHg |
| 2.5 psi | 129.29 mmHg |
| 3 psi | 155.14 mmHg |
| 4 psi | 206.86 mmHg |
| 5 psi | 258.57 mmHg |
| 6 psi | 310.29 mmHg |
| 7 psi | 362 mmHg |
| 8 psi | 413.72 mmHg |
| 9 psi | 465.43 mmHg |
| 10 psi | 517.15 mmHg |
| 14 psi | 724.01 mmHg |
| 15 psi | 775.72 mmHg |
| 20 psi | 1034.3 mmHg |
| 25 psi | 1292.9 mmHg |
| 30 psi | 1551.4 mmHg |
| 32 psi | 1654.9 mmHg |
| 35 psi | 1810 mmHg |
| 40 psi | 2068.6 mmHg |
| 50 psi | 2585.7 mmHg |
| 60 psi | 3102.9 mmHg |
| 75 psi | 3878.6 mmHg |
| 80 psi | 4137.2 mmHg |
| 100 psi | 5171.5 mmHg |
| 101.325 psi | 5240 mmHg |
| 150 psi | 7757.2 mmHg |
| 200 psi | 10343 mmHg |
| 250 psi | 12929 mmHg |
| 300 psi | 15514 mmHg |
| 400 psi | 20686 mmHg |
| 500 psi | 25857 mmHg |
| 760 psi | 39303 mmHg |
| 1000 psi | 51715 mmHg |
| 1013.25 psi | 52400 mmHg |
| 2000 psi | 103430 mmHg |
| 5000 psi | 258575 mmHg |
| 10000 psi | 517149 mmHg |
| 14.7 psi | 760.21 mmHg |
| 50000 psi | 2585746 mmHg |
| 100000 psi | 5171493 mmHg |
| 101325 psi | 5240015 mmHg |
| 200000 psi | 10342985 mmHg |
| 500000 psi | 25857463 mmHg |
| 1000000 psi | 51714925 mmHg |
| 10000000 psi | 517149252 mmHg |
Most US passenger-car tires call for 32–35 psi. A typical bicycle tire runs 50–80 psi. In millimeters of mercury, that gives you: 1 psi = 51.7149 mmHg, 10 psi = 517.149 mmHg, 100 psi = 5171.49 mmHg.
The pound per square inch (psi) is the customary US pressure unit, derived from the avoirdupois pound-force on a square inch (≈ 6,894.76 Pa exactly). It is the standard unit on US car tire-pressure stickers, scuba gauges in the US, and most plumbing specifications.
The millimeter of mercury (mmHg) equals approximately 133.322 Pa — the pressure exerted by a 1 mm column of mercury under standard gravity. It is the conventional unit for blood pressure worldwide, even in countries that have otherwise gone fully metric.