Convert pressure units — pascal, PSI, bar, atmosphere, torr, mmHg and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 Torr | 0.001 mmHg | |
| 0.01 Torr | 0.01 mmHg | |
| 0.1 Torr | 0.1 mmHg | |
| 1 Torr | 1 mmHg | |
| 5 Torr | 5 mmHg | |
| 10 Torr | 10 mmHg | |
| 50 Torr | 50 mmHg | |
| 100 Torr | 100 mmHg | |
| 1000 Torr | 1000 mmHg |
Formula: mmHg = Torr × 1
Multiply any torr value by 1 to get mmhg.
Reverse: Torr = mmHg × 1
Common torr values — factor: 1 Torr = 1 mmHg
| Torr (Torr) | mmHg (mmHg) | Context |
|---|---|---|
| 0.001 Torr | 0.001 mmHg | Ultra-high vacuum |
| 0.01 Torr | 0.01 mmHg | High vacuum |
| 0.1 Torr | 0.1 mmHg | Medium vacuum |
| 1 Torr | 1 mmHg | Low vacuum |
| 10 Torr | 10 mmHg | Rough vacuum |
| 100 Torr | 100 mmHg | Near-vacuum |
| 760 Torr | 760 mmHg | 1 atm / sea level |
| 1,000 Torr | 1,000 mmHg | Slight above atm |
| 7,600 Torr | 7,600 mmHg | 10 atm |
| 1e+04 Torr | 1e+04 mmHg | 100 mbar |
| 7.6e+04 Torr | 7.6e+04 mmHg | 100 atm |
| 100,000 Torr | 100,000 mmHg | 1.3 atm |
| 760,000 Torr | 760,000 mmHg | 1,000 atm |
| 1,000,000 Torr | 1,000,000 mmHg | High pressure |
| 10,000,000 Torr | 10,000,000 mmHg | Very high |
1 Torr = 1 mmHg exactly by modern definition. No conversion needed.
Torr and mmHg are numerically identical — just different names for the same pressure.
Torr is named after Torricelli; mmHg describes the physical mercury column.
Measures and interprets blood pressure in mmHg — the global clinical standard.
Measures intraocular pressure in mmHg to screen for and manage glaucoma.
Monitors arterial blood pressure and ventilator settings in mmHg.
Specifies rough vacuum ranges in torr/mmHg for laboratory systems.
Measures pulmonary artery pressure and oxygen partial pressure in mmHg.
Quantifies gas partial pressures (O₂, CO₂) in blood and tissues in mmHg.
The torr was named after Evangelista Torricelli, who invented the mercury barometer in 1644. One torr is defined as 1/760 of standard atmospheric pressure (133.322 Pa), and is equal to 1 mmHg at 0°C.
Torr is the standard pressure unit in vacuum science and semiconductor manufacturing. High vacuum systems operate at 10⁻³ to 10⁻⁷ torr. Ultra-high vacuum (used in particle accelerators) reaches below 10⁻¹⁰ torr.
Interesting fact: Torricelli's original barometer experiment used a 1-meter tube of mercury that settled at 760 mm above the reservoir — directly defining the unit that would later bear his name.
Millimeters of mercury (mmHg) is the traditional medical pressure unit, defined as the pressure exerted by a 1 mm column of mercury at 0°C under standard gravity. It equals 133.322 Pa and is numerically identical to the torr.
Blood pressure is universally measured in mmHg worldwide: normal blood pressure is about 120/80 mmHg. Intraocular pressure (glaucoma screening) is measured in mmHg. Gas partial pressures in physiology are quoted in mmHg.
Interesting fact: The sphygmomanometer (blood pressure cuff) still uses mmHg more than 130 years after its invention, making mmHg one of the most clinically important pressure units despite not being an SI unit.
Converting torr to mmhg is a common task in engineering, medicine, meteorology, and science. Different industries and countries use different pressure units — PSI in the US, bar in Europe, mmHg in medicine, and pascals in physics — making accurate conversion essential for cross-disciplinary work.
Quick reference: 5 Torr = 5 mmHg and 10 Torr = 10 mmHg. For the reverse: 1 mmHg = 1 Torr. The exact factor is 1 Torr = 1 mmHg.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.