Torr (Torr) to Millimeters of mercury (mmHg) Conversion
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
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 (Torr) | Millimeters of mercury (mmHg) |
|---|---|
| 0.1 Torr | 0.10 mmHg |
| 1 Torr | 1.00 mmHg |
| 2 Torr | 2.00 mmHg |
| 3 Torr | 3.00 mmHg |
| 5 Torr | 5.00 mmHg |
| 10 Torr | 10.00 mmHg |
| 20 Torr | 20.00 mmHg |
| 30 Torr | 30.00 mmHg |
| 50 Torr | 50.00 mmHg |
| 100 Torr | 100.00 mmHg |
| 1000 Torr | 1,000.00 mmHg |
Frequently Asked Questions (FAQ)
How many millimeters of mercury are in 1 torr?
1 torr (Torr) is exactly 1 millimeters of mercury (mmHg).
How do I convert torr to millimeters of mercury?
Multiply the value in torr by 1 to get the result in millimeters of mercury. Or use the converter above — type any number and see the result instantly.