How many millimeter of mercury [0 °C] in 1 inch mercury? The answer is 25.400002205181. We assume you are converting between millimeter of mercury [0 °C] and inch mercury [0 °C]. You can view more details on each measurement unit: millimeter of mercury [0 °C] or inch mercury The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.0075006156130264 millimeter of mercury [0 °C], or 0.00029529980164712 inch mercury. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millimeters of mercury and inches mercury. Type in your own numbers in the form to convert the units!
1 millimeter of mercury [0 °C] to inch mercury = 0.03937 inch mercury
10 millimeter of mercury [0 °C] to inch mercury = 0.3937 inch mercury
20 millimeter of mercury [0 °C] to inch mercury = 0.7874 inch mercury
30 millimeter of mercury [0 °C] to inch mercury = 1.1811 inch mercury
40 millimeter of mercury [0 °C] to inch mercury = 1.5748 inch mercury
50 millimeter of mercury [0 °C] to inch mercury = 1.9685 inch mercury
100 millimeter of mercury [0 °C] to inch mercury = 3.93701 inch mercury
200 millimeter of mercury [0 °C] to inch mercury = 7.87402 inch mercury
You can do the reverse unit conversion from inch mercury to millimeter of mercury [0 °C], or enter any two units below:
The torr (symbol: Torr) or millimetre of mercury (mmHg) is a non-SI unit of pressure. It is the atmospheric pressure that supports a column of mercury 1 millimetre high. The unit is named after Evangelista Torricelli, Italian physicist and mathematician, for his discovery of the principle of the barometer in 1643.
Inches of mercury or inHg is a non-SI unit for pressure. It is still widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.
It is defined as the pressure exerted by a column of mercury of 1 inch in height at 32 °F (0 °C) at the standard acceleration of gravity.
1 inHg = 3,386.389 pascals at 0 °C.
Aircraft operating at higher altitudes (above 18,000 feet) set their barometric altimeters to a standard pressure of 29.92 inHg or 1,013.2 hPa (1 hPa = 1 mbar) regardless of the actual sea level pressure, with inches of mercury used in the U.S. and Canada. The resulting altimeter readings are known as flight levels.
Piston engine aircraft with constant-speed propellers also use inHg to measure manifold pressure, which is indicative of engine power produced.
ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 70 kg, 150 lbs, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!