Convert inch of mercury to atmosphere
1 inHg = 0.03342105739 atm
1 inHg = 0.033421 atm
1 inHg in every pressure unit
| microbar | 33,864 μbar |
| barye | 33,864 Ba |
| millitorr | 25,400 mTorr |
| pascal | 3,386.4 Pa |
| millimeter of water column | 345.32 mmH₂O |
| pound per square foot | 70.726 lb/ft² |
| centimeter of water column | 34.532 cmH₂O |
| hectopascal | 33.864 hPa |
| millibar | 33.864 mbar |
| torr | 25.4 Torr |
| millimeter of mercury | 25.4 mmHg |
| inch of water column | 13.595 in w.g. |
| kilopascal | 3.3864 kPa |
| foot of water column | 1.1329 ft H₂O |
| inch of mercury | 1 inHg |
| pound per square inch | 0.49115 psi |
| meter of water column | 0.34532 m H₂O |
| decibar | 0.33864 dbar |
| kilogram-force per square centimeter | 0.034532 kgf/cm² |
| bar | 0.033864 bar |
| atmosphere | 0.033421 atm |
| megapascal | 0.0033864 MPa |
| kip per square inch | 0.00049115 ksi |
| gigapascal | 0.0000033864 GPa |
| million pounds per square inch | 4.9115e-07 Mpsi |
How the conversion works
Multiply by 0.03342105739 to go from inch of mercury to atmosphere, or divide by it to go back. Every conversion on this site routes through the SI value (Pa) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? atmosphere to inch of mercury — 1 atm = 29.92125558 inHg.
inch of mercury to atmosphere — common values
| 1 inHg | 0.033421057 atm |
| 2 inHg | 0.066842115 atm |
| 3 inHg | 0.10026317 atm |
| 5 inHg | 0.16710529 atm |
| 10 inHg | 0.33421057 atm |
| 15 inHg | 0.50131586 atm |
| 20 inHg | 0.66842115 atm |
| 25 inHg | 0.83552643 atm |
| 50 inHg | 1.6710529 atm |
| 75 inHg | 2.5065793 atm |
| 100 inHg | 3.3421057 atm |
| 250 inHg | 8.3552643 atm |
| 500 inHg | 16.710529 atm |
| 1000 inHg | 33.421057 atm |