Millimeters of mercury (mmHg) to Pounds per square inch (psi) Conversion
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
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 (mmHg) | Pounds per square inch (psi) |
|---|---|
| 0.1 mmHg | 0.00193 psi |
| 1 mmHg | 0.0193 psi |
| 2 mmHg | 0.0387 psi |
| 3 mmHg | 0.058 psi |
| 5 mmHg | 0.0967 psi |
| 10 mmHg | 0.1934 psi |
| 20 mmHg | 0.3867 psi |
| 30 mmHg | 0.5801 psi |
| 50 mmHg | 0.9668 psi |
| 100 mmHg | 1.9337 psi |
| 1000 mmHg | 19.3368 psi |
Frequently Asked Questions (FAQ)
How many pounds per square inch are in 1 millimeters of mercury?
1 millimeters of mercury (mmHg) is exactly 0.019337 pounds per square inch (psi).
How do I convert millimeters of mercury to pounds per square inch?
Multiply the value in millimeters of mercury by 0.019337 to get the result in pounds per square inch. Or use the converter above — type any number and see the result instantly.