Convert pressure units — pascal, PSI, bar, atmosphere, torr, mmHg and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 mmHg | 0.001 Torr | |
| 0.01 mmHg | 0.01 Torr | |
| 0.1 mmHg | 0.1 Torr | |
| 1 mmHg | 1 Torr | |
| 5 mmHg | 5 Torr | |
| 10 mmHg | 10 Torr | |
| 50 mmHg | 50 Torr | |
| 100 mmHg | 100 Torr | |
| 1000 mmHg | 1000 Torr |
Formula: Torr = mmHg × 1
Multiply any mmhg value by 1 to get torr.
Reverse: mmHg = Torr × 1
Common mmhg values — factor: 1 mmHg = 1 Torr
| mmHg (mmHg) | Torr (Torr) | Context |
|---|---|---|
| 1 mmHg | 1 Torr | Very low / ophthalmic |
| 5 mmHg | 5 Torr | Low IOP |
| 10 mmHg | 10 Torr | Diastolic minimum |
| 20 mmHg | 20 Torr | Low BP diastolic |
| 40 mmHg | 40 Torr | Low BP range |
| 60 mmHg | 60 Torr | Hypotensive |
| 80 mmHg | 80 Torr | Normal diastolic |
| 100 mmHg | 100 Torr | Elevated diastolic |
| 120 mmHg | 120 Torr | Normal systolic |
| 200 mmHg | 200 Torr | High BP |
| 300 mmHg | 300 Torr | Hypertensive crisis |
| 760 mmHg | 760 Torr | 1 atm |
| 1,000 mmHg | 1,000 Torr | Above atm |
| 2,000 mmHg | 2,000 Torr | ~2.6 atm |
| 1e+04 mmHg | 1e+04 Torr | ~13 atm |
1 mmHg = 1 Torr exactly. No conversion needed.
They represent the same pressure — use whichever label your instrument requires.
Medicine uses mmHg; vacuum science prefers Torr.
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.
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.
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.
Converting mmhg to torr 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 mmHg = 5 Torr and 10 mmHg = 10 Torr. For the reverse: 1 Torr = 1 mmHg. The exact factor is 1 mmHg = 1 Torr.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.