Convert pressure units — pascal, PSI, bar, atmosphere, torr, mmHg and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 mmHg | 1.31579e-06 atm | |
| 0.01 mmHg | 1.31579e-05 atm | |
| 0.1 mmHg | 0.000131579 atm | |
| 1 mmHg | 0.00131579 atm | |
| 5 mmHg | 0.00657893 atm | |
| 10 mmHg | 0.0131579 atm | |
| 50 mmHg | 0.0657893 atm | |
| 100 mmHg | 0.131579 atm | |
| 1000 mmHg | 1.31579 atm |
Formula: Atmosphere = mmHg × 0.001316
Multiply any mmhg value by 0.001316 to get atmosphere.
Reverse: mmHg = Atmosphere × 760
Common mmhg values — factor: 1 mmHg = 0.001316 atm
| mmHg (mmHg) | Atmosphere (atm) | Context |
|---|---|---|
| 1 mmHg | 0.001316 atm | Very low / ophthalmic |
| 5 mmHg | 0.006579 atm | Low IOP |
| 10 mmHg | 0.01316 atm | Diastolic minimum |
| 20 mmHg | 0.02632 atm | Low BP diastolic |
| 40 mmHg | 0.05263 atm | Low BP range |
| 60 mmHg | 0.07895 atm | Hypotensive |
| 80 mmHg | 0.1053 atm | Normal diastolic |
| 100 mmHg | 0.1316 atm | Elevated diastolic |
| 120 mmHg | 0.1579 atm | Normal systolic |
| 200 mmHg | 0.2632 atm | High BP |
| 300 mmHg | 0.3947 atm | Hypertensive crisis |
| 760 mmHg | 1 atm | 1 atm |
| 1,000 mmHg | 1.316 atm | Above atm |
| 2,000 mmHg | 2.632 atm | ~2.6 atm |
| 1e+04 mmHg | 13.16 atm | ~13 atm |
1 mmHg = 0.001316 atm. Memorize for instant estimates.
Use 0.0013 as a quick mental multiplier.
Multiply result by 760 to recover the original mmHg value.
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 atmosphere (atm) is defined as exactly 101,325 pascals — the approximate air pressure at sea level. It was originally defined as the average atmospheric pressure at sea level at 45° latitude, and has been a standard reference since the 17th century.
Atmospheres are used in chemistry (gas laws), scuba diving depth calculations (every 10 m of water ≈ 1 additional atm), and as a convenient reference for extreme pressure comparisons.
Interesting fact: Jupiter's atmosphere has pressures exceeding 1,000 atm at depth. Diamond formation in Earth's mantle requires pressures of 45,000–60,000 atm at depths of 150–200 km.
Converting mmhg to atmosphere 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 = 0.006579 atm and 10 mmHg = 0.01316 atm. For the reverse: 1 atm = 760 mmHg. The exact factor is 1 mmHg = 0.001316 atm.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.