Psi to millimeters of mercury
Type a value in psi to see it in millimeters of mercury straight away, or type in the second box to convert back.
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How to use it
- Type the value in the psi box.
- Read the result in millimeters of mercury as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
mmHg = psi × 51.7149252
Multiply the value in psi by 51.7149252 to get millimeters of mercury.
Example
To convert 25 psi to millimeters of mercury: 25 × 51.7149252 = 1,292.87 mmHg.
Conversion table
| Psi (psi) | Millimeters of mercury (mmHg) |
|---|---|
| 1 | 51.7149 |
| 2 | 103.43 |
| 3 | 155.145 |
| 5 | 258.575 |
| 10 | 517.149 |
| 20 | 1,034.3 |
| 25 | 1,292.87 |
| 50 | 2,585.75 |
| 100 | 5,171.49 |
| 250 | 12,928.7 |
| 500 | 25,857.5 |
| 1,000 | 51,714.9 |
About the units
- Psi
- One pound-force per square inch, about 6894.757 pascals from the exact definitions of the pound, inch and standard gravity.
- Millimeter of mercury
- The pressure of a 1 mm mercury column at the conventional density 13,595.1 kg/m³ and standard gravity: 133.322387415 Pa. Used for blood pressure.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many millimeters of mercury are in one psi?
1 psi = 51.7149 mmHg exactly.
How do I convert psi to millimeters of mercury?
Use mmHg = psi × 51.7149252. For example, 25 psi = 1,292.87 mmHg.
How many psi are in one millimeter of mercury?
1 mmHg = 0.0193368 psi.
What is the difference between gauge and absolute pressure?
Gauge pressure is measured from the surrounding air pressure, while absolute pressure starts from a perfect vacuum. These converters change the unit only, so a gauge reading stays a gauge reading.
Are torr and mmHg the same?
Almost. One torr is 101325/760 Pa, about 133.322368 Pa, and one conventional mmHg is 133.322387 Pa, a difference of less than one part per million. For everyday use you can treat them as equal.