How to convert millimeters of mercury to pounds per square inch
- Take the value in millimeters of mercury.
- Use the formula pounds per square inch = millimeters of mercury × 0.01933677746.
- For example, 80 mmHg is 1.55 psi.
About millimeters of mercury and pounds per square inch
One millimeter of mercury is 133.322 Pa, and one psi is 6,894.76 Pa, so 1 mmHg is 0.0193368 psi. Multiply mmHg by 0.01934 to get psi, or divide by 51.715. Standard atmospheric pressure, 760 mmHg, is 14.696 psi.
Medicine measures blood pressure in mmHg, and so do many vacuum gauges and lab instruments, while US equipment such as pumps, compressors and tire gauges reads in psi. Converting puts the two on the same scale; a reading of 120 mmHg is a little over 2.3 psi above atmospheric pressure.
Examples
- 80 mmHg (a diastolic blood pressure of 80) is 1.55 psi
- 120 mmHg (a systolic blood pressure of 120) is 2.32 psi
- 300 mmHg (the top of a typical blood pressure cuff scale) is 5.8 psi
- 760 mmHg (standard atmospheric pressure) is 14.7 psi
Millimeters of mercury to pounds per square inch chart
| Millimeters of mercury (mmHg) | Pounds per square inch (psi) |
|---|---|
| 1 | 0.0193 |
| 5 | 0.0967 |
| 10 | 0.193 |
| 20 | 0.387 |
| 25 | 0.483 |
| 50 | 0.967 |
| 51.72 | 1 |
| 60 | 1.16 |
| 80 | 1.55 |
| 100 | 1.93 |
| 120 | 2.32 |
| Millimeters of mercury (mmHg) | Pounds per square inch (psi) |
|---|---|
| 140 | 2.71 |
| 150 | 2.9 |
| 200 | 3.87 |
| 250 | 4.83 |
| 300 | 5.8 |
| 400 | 7.73 |
| 500 | 9.67 |
| 600 | 11.6 |
| 700 | 13.54 |
| 760 | 14.7 |