Convert pressure units — pascal, PSI, bar, atmosphere, torr, mmHg and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 mmHg | 3.93699e-05 inHg | |
| 0.01 mmHg | 0.000393699 inHg | |
| 0.1 mmHg | 0.00393699 inHg | |
| 1 mmHg | 0.0393699 inHg | |
| 5 mmHg | 0.19685 inHg | |
| 10 mmHg | 0.393699 inHg | |
| 50 mmHg | 1.9685 inHg | |
| 100 mmHg | 3.93699 inHg | |
| 1000 mmHg | 39.3699 inHg |
Formula: Inch Hg = mmHg × 0.03937
Multiply any mmhg value by 0.03937 to get inch hg.
Reverse: mmHg = Inch Hg × 25.4
Common mmhg values — factor: 1 mmHg = 0.03937 inHg
| mmHg (mmHg) | Inch Hg (inHg) | Context |
|---|---|---|
| 1 mmHg | 0.03937 inHg | Very low / ophthalmic |
| 5 mmHg | 0.1968 inHg | Low IOP |
| 10 mmHg | 0.3937 inHg | Diastolic minimum |
| 20 mmHg | 0.7874 inHg | Low BP diastolic |
| 40 mmHg | 1.575 inHg | Low BP range |
| 60 mmHg | 2.362 inHg | Hypotensive |
| 80 mmHg | 3.15 inHg | Normal diastolic |
| 100 mmHg | 3.937 inHg | Elevated diastolic |
| 120 mmHg | 4.724 inHg | Normal systolic |
| 200 mmHg | 7.874 inHg | High BP |
| 300 mmHg | 11.81 inHg | Hypertensive crisis |
| 760 mmHg | 29.92 inHg | 1 atm |
| 1,000 mmHg | 39.37 inHg | Above atm |
| 2,000 mmHg | 78.74 inHg | ~2.6 atm |
| 1e+04 mmHg | 393.7 inHg | ~13 atm |
1 mmHg = 0.03937 inHg. Memorize for instant estimates.
Use 0.0394 as a quick mental multiplier.
Multiply result by 25.4 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.
Inches of mercury (inHg) is the pressure unit used in US aviation and weather reporting, defined as the pressure exerted by a 1-inch column of mercury (3,386.39 Pa). It has been standard in US aviation since the early 20th century.
US aviation altimeters are set in inHg (standard: 29.92 inHg). US weather broadcasts report barometric pressure in inHg. HVAC engineers in the US use inHg for duct static pressure measurements.
Interesting fact: Pilots set their altimeter to the local QNH (pressure at sea level) in inHg to ensure their altitude reading is accurate — a difference of 0.1 inHg causes an altimeter error of about 100 feet.
Converting mmhg to inch hg 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 = 0.1968 inHg and 10 mmHg = 0.3937 inHg. For the reverse: 1 inHg = 25.4 mmHg. The exact factor is 1 mmHg = 0.03937 inHg.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.