Convert millimeters of mercury to psi
Converting millimeters of mercury to psi is a common pressure task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 mmHg equals 0.0193368 psi, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert millimeters of mercury to psi
To convert millimeters of mercury to psi, multiply the number of millimeters of mercury by 0.0193368. For example, 10 mmHg × 0.0193368 = 0.193368 psi.
psi = mmHg × 0.0193368
- Write down the value in millimeters of mercury you want to convert.
- Multiply it by 0.0193368 (the exact mmHg→psi factor).
- The result is your value in psi. Check it below with the converter or the table.
Conversion table
Common values of millimeters of mercury and their equivalents in psi:
| mmHg | psi |
|---|---|
| 1 | 0.0193368 |
| 2 | 0.0386736 |
| 3 | 0.0580103 |
| 4 | 0.0773471 |
| 5 | 0.0966839 |
| 10 | 0.193368 |
| 20 | 0.386736 |
| 25 | 0.483419 |
| 50 | 0.966839 |
| 100 | 1.93368 |
| 250 | 4.83419 |
| 500 | 9.66839 |
About these units
Millimeter of Mercury (mmHg). A millimeter of mercury is the pressure exerted by a one-millimeter column of mercury, about 133.32 pascals. Blood pressure and vacuum measurements are still quoted in mmHg.
PSI (psi). Pounds per square inch (psi) is the US customary pressure unit, one pound-force applied to one square inch. Tire gauges, compressed air and hydraulics in the US are measured in psi.
Frequently asked questions
How do I convert millimeters of mercury to psi?
To convert millimeters of mercury to psi, multiply the number of millimeters of mercury by 0.0193368. For example, 10 mmHg × 0.0193368 = 0.193368 psi. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many psi are in 1 millimeter of mercury?
1 mmHg = 0.0193368 psi. That is the fixed relationship used by this converter and by international standards.
How many millimeters of mercury are in 1 psi?
1 psi = 51.7149 mmHg. If you are converting in the opposite direction, use our PSI to Millimeter of Mercury converter for the dedicated table and FAQ.
Is the millimeters of mercury to psi conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.0193368 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is millimeter of mercury used for?
A millimeter of mercury is the pressure exerted by a one-millimeter column of mercury, about 133.32 pascals. Blood pressure and vacuum measurements are still quoted in mmHg.