Convert pressure units — pascal, PSI, bar, atmosphere, torr, mmHg and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 atm | 0.760002 mmHg | |
| 0.01 atm | 7.60002 mmHg | |
| 0.1 atm | 76.0002 mmHg | |
| 1 atm | 760.002 mmHg | |
| 5 atm | 3800.01 mmHg | |
| 10 atm | 7600.02 mmHg | |
| 50 atm | 38000.1 mmHg | |
| 100 atm | 76000.2 mmHg | |
| 1000 atm | 760002 mmHg |
Formula: mmHg = Atmosphere × 760
Multiply any atmosphere value by 760 to get mmhg.
Reverse: Atmosphere = mmHg × 0.001316
Common atmosphere values — factor: 1 atm = 760 mmHg
| Atmosphere (atm) | mmHg (mmHg) | Context |
|---|---|---|
| 0.001 atm | 0.76 mmHg | Vacuum |
| 0.01 atm | 7.6 mmHg | High vacuum |
| 0.1 atm | 76 mmHg | Mountain top |
| 0.5 atm | 380 mmHg | Half atmosphere |
| 1 atm | 760 mmHg | Sea level |
| 2 atm | 1,520 mmHg | 10 m water depth |
| 5 atm | 3,800 mmHg | 40 m depth |
| 10 atm | 7,600 mmHg | 90 m depth |
| 50 atm | 3.8e+04 mmHg | 500 m depth |
| 100 atm | 7.6e+04 mmHg | 1 km depth |
| 500 atm | 380,000 mmHg | 5 km depth |
| 1,000 atm | 760,000 mmHg | 10 km depth |
| 5,000 atm | 3,800,000 mmHg | Deep mantle |
| 1e+04 atm | 7,600,000 mmHg | Very deep mantle |
| 5e+04 atm | 38,000,000 mmHg | Diamond formation |
1 atm = 760 mmHg. Memorize for instant estimates.
Use 760 as a quick mental multiplier.
Multiply result by 0.001316 to recover the original atm value.
Uses atmospheres in gas law calculations (PV = nRT) and solubility studies.
Calculates dive depth pressure (every 10 m adds ~1 atm) for dive tables.
Designs diamond anvil cell experiments measuring pressure in thousands of atm.
Specifies autoclave and reactor operating pressures relative to atm.
Estimates metamorphic rock formation pressures in kbar (thousands of atm).
Plans saturation diving operations using atm for depth-pressure calculations.
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.
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 atmosphere 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 atm = 3800 mmHg and 10 atm = 7600 mmHg. For the reverse: 1 mmHg = 0.001316 atm. The exact factor is 1 atm = 760 mmHg.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.