Inches of Mercury to Millibars (inHg → mbar)
Formula
1 inHg = 33.86389 mbarConversion Table
| inHg | mbar |
|---|---|
| 0 | 0 |
| 1.0000 | 33.864 |
| 2.0000 | 67.728 |
| 3.0000 | 101.59 |
| 4.0000 | 135.46 |
| 5.0000 | 169.32 |
| 6.0000 | 203.18 |
| 7.0000 | 237.05 |
| 8.0000 | 270.91 |
| 9.0000 | 304.78 |
| 10.000 | 338.64 |
| 11.000 | 372.50 |
| 12.000 | 406.37 |
| 13.000 | 440.23 |
| 14.000 | 474.09 |
| 15.000 | 507.96 |
| 16.000 | 541.82 |
| 17.000 | 575.69 |
| 18.000 | 609.55 |
| 19.000 | 643.41 |
| inHg | mbar |
|---|---|
| 20.000 | 677.28 |
| 21.000 | 711.14 |
| 22.000 | 745.01 |
| 23.000 | 778.87 |
| 24.000 | 812.73 |
| 25.000 | 846.60 |
| 26.000 | 880.46 |
| 27.000 | 914.33 |
| 28.000 | 948.19 |
| 29.000 | 982.05 |
| 30.000 | 1,015.9 |
| 31.000 | 1,049.8 |
| 32.000 | 1,083.6 |
| 33.000 | 1,117.5 |
| 34.000 | 1,151.4 |
| 35.000 | 1,185.2 |
| 36.000 | 1,219.1 |
| 37.000 | 1,253.0 |
| 38.000 | 1,286.8 |
| 39.000 | 1,320.7 |
| inHg | mbar |
|---|---|
| 40.000 | 1,354.6 |
| 41.000 | 1,388.4 |
| 42.000 | 1,422.3 |
| 43.000 | 1,456.1 |
| 44.000 | 1,490.0 |
| 45.000 | 1,523.9 |
| 46.000 | 1,557.7 |
| 47.000 | 1,591.6 |
| 48.000 | 1,625.5 |
| 49.000 | 1,659.3 |
| 50.000 | 1,693.2 |
| 51.000 | 1,727.1 |
| 52.000 | 1,760.9 |
| 53.000 | 1,794.8 |
| 54.000 | 1,828.7 |
| 55.000 | 1,862.5 |
| 56.000 | 1,896.4 |
| 57.000 | 1,930.2 |
| 58.000 | 1,964.1 |
| 59.000 | 1,998.0 |
| inHg | mbar |
|---|---|
| 60.000 | 2,031.8 |
| 61.000 | 2,065.7 |
| 62.000 | 2,099.6 |
| 63.000 | 2,133.4 |
| 64.000 | 2,167.3 |
| 65.000 | 2,201.2 |
| 66.000 | 2,235.0 |
| 67.000 | 2,268.9 |
| 68.000 | 2,302.7 |
| 69.000 | 2,336.6 |
| 70.000 | 2,370.5 |
| 71.000 | 2,404.3 |
| 72.000 | 2,438.2 |
| 73.000 | 2,472.1 |
| 74.000 | 2,505.9 |
| 75.000 | 2,539.8 |
| 76.000 | 2,573.7 |
| 77.000 | 2,607.5 |
| 78.000 | 2,641.4 |
| 79.000 | 2,675.2 |
Inches of Mercury to Millibars Conversion
Converting Inches of Mercury (inHg) to Millibars (mbar) is a common pressure conversion. 1 inHg equals 33.86389 mbar. For example, 100 inHg is equal to 3,386.389 mbar.
Quick Reference Values
1 inHg = 33.86389 mbar. 5 inHg = 169.31945 mbar. 10 inHg = 338.6389 mbar. 25 inHg = 846.59725 mbar. 50 inHg = 1,693.1945 mbar. 100 inHg = 3,386.389 mbar.
What is Inches of Mercury?
Inches of Mercury (inHg) is a unit of pressure. Inches of mercury measure pressure as the height of a mercury column in inches exerted by atmospheric or other pressures. One inch of mercury equals exactly 3,386.389 pascals (Pa). This unit is commonly used in barometry and aviation altimetry [nist-si-guide]. The unit originates from mercury barometers developed by Evangelista Torricelli in 1643. Measuring pressure via mercury column height became standard in meteorology and aviation. The inch unit was adapted for use in English-speaking countries [nist-si-guide]. Inches of mercury are used mainly in the United States and Canada for weather reports and aircraft altimeters. Internationally, the pascal is preferred, but inHg remains common in aviation and HVAC industries [nist-si-guide].
What is Millibars?
Millibars (mbar) is a unit of pressure. The millibar is a unit of pressure equal to 100 pascals or 0.1 kilopascals. It is one-thousandth of a bar, which is defined as exactly 100,000 pascals in the International System of Units (SI). The millibar is commonly used in meteorology to measure atmospheric pressure and is recognized under ISO standards for pressure units [iso-80000]. The bar and its subunit, the millibar, were introduced by the German meteorologist Heinrich von Helmholtz in the early 20th century. The millibar was adopted as a practical unit for meteorological pressure measurements before SI units were formalized [nist-sp-811]. Millibars remain widely used in weather reports and aviation worldwide, especially in countries like the United States, United Kingdom, and Australia. Meteorological agencies, including NOAA and the UK Met Office, use millibars alongside pascals for atmospheric pressure [nist-sp-811].
Common Misspellings
People often search for this conversion using these alternate spellings: inch of mercury, inch-mercury, in hg, inches mercury, milibars, milibars, millibar, milibar. All of these refer to the Inches of Mercury to Millibars conversion.