Pounds per square inch (psi) to Millimeters of mercury (mmHg) Conversion
Pounds per square inch
Pounds per square inch (psi) is a unit of pressure defined as one pound-force per square inch (approximately 6,894.76 Pa). It is the standard for tyre pressure, hydraulic systems, and gas cylinders in the United States. Standard atmospheric pressure is approximately 14.696 psi. In engineering, gauge pressure (psig — relative to atmosphere) is distinguished from absolute pressure (psia — relative to a perfect vacuum), a distinction critical in thermodynamics and fluid system design.
Millimeters of mercury
The millimetre of mercury (mmHg) is a unit of pressure equal to the pressure exerted by a 1 mm column of mercury at 0 °C and standard gravity — approximately 133.322 Pa. It is the universal clinical standard for measuring blood pressure: normal adult blood pressure is approximately 120/80 mmHg (systolic/diastolic). The mmHg is also used in ophthalmology (intraocular pressure, normal ≈ 10–21 mmHg) and respiratory physiology.
| Pounds per square inch (psi) | Millimeters of mercury (mmHg) |
|---|---|
| 0.1 psi | 5.1715 mmHg |
| 1 psi | 51.7149 mmHg |
| 2 psi | 103.4299 mmHg |
| 3 psi | 155.1448 mmHg |
| 5 psi | 258.5747 mmHg |
| 10 psi | 517.1493 mmHg |
| 20 psi | 1,034.2986 mmHg |
| 30 psi | 1,551.448 mmHg |
| 50 psi | 2,585.7466 mmHg |
| 100 psi | 5,171.4932 mmHg |
| 1000 psi | 51,714.932 mmHg |
Frequently Asked Questions (FAQ)
How many millimeters of mercury are in 1 pounds per square inch?
1 pounds per square inch (psi) is exactly 51.715 millimeters of mercury (mmHg).
How do I convert pounds per square inch to millimeters of mercury?
Multiply the value in pounds per square inch by 51.715 to get the result in millimeters of mercury. Or use the converter above — type any number and see the result instantly.