Atmospheres to Inches of Mercury (atm → inHg)
Formula
1 atm = 29.921252401894762 inHgConversion Table
| atm | inHg |
|---|---|
| 0 | 0 |
| 1.0000 | 29.921 |
| 2.0000 | 59.843 |
| 3.0000 | 89.764 |
| 4.0000 | 119.69 |
| 5.0000 | 149.61 |
| 6.0000 | 179.53 |
| 7.0000 | 209.45 |
| 8.0000 | 239.37 |
| 9.0000 | 269.29 |
| 10.000 | 299.21 |
| 11.000 | 329.13 |
| 12.000 | 359.06 |
| 13.000 | 388.98 |
| 14.000 | 418.90 |
| 15.000 | 448.82 |
| 16.000 | 478.74 |
| 17.000 | 508.66 |
| 18.000 | 538.58 |
| 19.000 | 568.50 |
| atm | inHg |
|---|---|
| 20.000 | 598.43 |
| 21.000 | 628.35 |
| 22.000 | 658.27 |
| 23.000 | 688.19 |
| 24.000 | 718.11 |
| 25.000 | 748.03 |
| 26.000 | 777.95 |
| 27.000 | 807.87 |
| 28.000 | 837.80 |
| 29.000 | 867.72 |
| 30.000 | 897.64 |
| 31.000 | 927.56 |
| 32.000 | 957.48 |
| 33.000 | 987.40 |
| 34.000 | 1,017.3 |
| 35.000 | 1,047.2 |
| 36.000 | 1,077.2 |
| 37.000 | 1,107.1 |
| 38.000 | 1,137.0 |
| 39.000 | 1,166.9 |
| atm | inHg |
|---|---|
| 40.000 | 1,196.9 |
| 41.000 | 1,226.8 |
| 42.000 | 1,256.7 |
| 43.000 | 1,286.6 |
| 44.000 | 1,316.5 |
| 45.000 | 1,346.5 |
| 46.000 | 1,376.4 |
| 47.000 | 1,406.3 |
| 48.000 | 1,436.2 |
| 49.000 | 1,466.1 |
| 50.000 | 1,496.1 |
| 51.000 | 1,526.0 |
| 52.000 | 1,555.9 |
| 53.000 | 1,585.8 |
| 54.000 | 1,615.7 |
| 55.000 | 1,645.7 |
| 56.000 | 1,675.6 |
| 57.000 | 1,705.5 |
| 58.000 | 1,735.4 |
| 59.000 | 1,765.4 |
| atm | inHg |
|---|---|
| 60.000 | 1,795.3 |
| 61.000 | 1,825.2 |
| 62.000 | 1,855.1 |
| 63.000 | 1,885.0 |
| 64.000 | 1,915.0 |
| 65.000 | 1,944.9 |
| 66.000 | 1,974.8 |
| 67.000 | 2,004.7 |
| 68.000 | 2,034.6 |
| 69.000 | 2,064.6 |
| 70.000 | 2,094.5 |
| 71.000 | 2,124.4 |
| 72.000 | 2,154.3 |
| 73.000 | 2,184.3 |
| 74.000 | 2,214.2 |
| 75.000 | 2,244.1 |
| 76.000 | 2,274.0 |
| 77.000 | 2,303.9 |
| 78.000 | 2,333.9 |
| 79.000 | 2,363.8 |
Atmospheres to Inches of Mercury Conversion
Converting Atmospheres (atm) to Inches of Mercury (inHg) is a common pressure conversion. 1 atm equals 29.921252 inHg. For example, 100 atm is equal to 2,992.12524 inHg.
Quick Mental Math: Atmospheres to Inches of Mercury
Multiply atmospheres by approximately 29.92 to convert to inches-of-mercury.
Why is converting Atmospheres to Inches of Mercury tricky?
The non-integer multiplier 29.92 is imprecise for mental estimation.
Quick Reference Values
1 atm = 29.921252 inHg. 5 atm = 149.606262 inHg. 10 atm = 299.212524 inHg. 25 atm = 748.03131 inHg. 50 atm = 1,496.06262 inHg. 100 atm = 2,992.12524 inHg.
What is Atmospheres?
Atmospheres (atm) is a unit of pressure. One atmosphere (atm) is a unit of pressure defined as exactly 101,325 pascals (Pa). It approximates the average air pressure at sea level on Earth. The atmosphere unit is used for expressing pressures in meteorology and engineering [iso-80000]. The atmosphere was originally defined in the 19th century based on average sea-level air pressure. It was standardized by the International Union of Pure and Applied Chemistry (IUPAC) and other bodies to equal 101,325 Pa in the mid-20th century [nist-sp-811]. Atmospheres are used worldwide in scientific fields, including chemistry and physics, and in engineering applications like pressure vessel design. It is less common in everyday use outside these fields [nist-sp-811].
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].
Common Misspellings
People often search for this conversion using these alternate spellings: atmosphers, atmosfere, atmospere, atmospherics, inch of mercury, inch-mercury, in hg, inches mercury. All of these refer to the Atmospheres to Inches of Mercury conversion.