Millimeters of mercury (mmHg) to Inches of mercury (inHg) 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.
Inches of mercury
The inch of mercury (inHg) is a unit of pressure equal to the pressure exerted by a column of mercury 1 inch (25.4 mm) high — approximately 3,386.39 Pa or 0.0334 atm. It is used in US aviation for altimeter settings (standard pressure is 29.92 inHg) and in US weather reports for barometric pressure. Pilots set their altimeters in inHg based on local barometric pressure to ensure accurate altitude readings.
| Millimeters of mercury (mmHg) | Inches of mercury (inHg) |
|---|---|
| 0.1 mmHg | 0.00394 inHg |
| 1 mmHg | 0.0394 inHg |
| 2 mmHg | 0.0787 inHg |
| 3 mmHg | 0.1181 inHg |
| 5 mmHg | 0.1969 inHg |
| 10 mmHg | 0.3937 inHg |
| 20 mmHg | 0.7874 inHg |
| 30 mmHg | 1.1811 inHg |
| 50 mmHg | 1.9685 inHg |
| 100 mmHg | 3.937 inHg |
| 1000 mmHg | 39.3701 inHg |
Frequently Asked Questions (FAQ)
How many inches of mercury are in 1 millimeters of mercury?
1 millimeters of mercury (mmHg) is exactly 0.03937 inches of mercury (inHg).
How do I convert millimeters of mercury to inches of mercury?
Multiply the value in millimeters of mercury by 0.03937 to get the result in inches of mercury. Or use the converter above — type any number and see the result instantly.