Millimeters of mercury (mmHg) to Torr (Torr) 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.
Torr
The torr is a unit of pressure named after Evangelista Torricelli, the Italian physicist who invented the mercury barometer in 1643. One torr is defined as exactly 1/760 of a standard atmosphere (approximately 133.322 Pa). Numerically nearly identical to the millimetre of mercury (mmHg), it differs by less than 0.000015%. The torr is used in vacuum science and engineering: rough vacuum is 1–100 torr, fine vacuum 10⁻³–1 torr, and ultra-high vacuum below 10⁻⁹ torr.
| Millimeters of mercury (mmHg) | Torr (Torr) |
|---|---|
| 0.1 mmHg | 0.1000000011851 Torr |
| 1 mmHg | 1.000000011851 Torr |
| 2 mmHg | 2.0000000237019 Torr |
| 3 mmHg | 3.0000000355529 Torr |
| 5 mmHg | 5.0000000592549 Torr |
| 10 mmHg | 10.00000011851 Torr |
| 20 mmHg | 20.000000237019 Torr |
| 30 mmHg | 30.000000355529 Torr |
| 50 mmHg | 50.000000592549 Torr |
| 100 mmHg | 100.0000011851 Torr |
| 1000 mmHg | 1000.000011851 Torr |
Frequently Asked Questions (FAQ)
How many torr are in 1 millimeters of mercury?
1 millimeters of mercury (mmHg) is exactly 1 torr (Torr).
How do I convert millimeters of mercury to torr?
Multiply the value in millimeters of mercury by 1 to get the result in torr. Or use the converter above — type any number and see the result instantly.