Convert inch of mercury to atmosphere
1 inHg = 0.03342105739 atm
1 inHg = 0.0334 atm
1 inHg in every pressure unit
| pascal | 3,390 Pa |
| kilopascal | 3.39 kPa |
| megapascal | 0.00339 MPa |
| bar | 0.0339 bar |
| atmosphere | 0.0334 atm |
| millimeter of mercury | 25.4 mmHg |
| pound per square inch | 0.491 psi |
| foot of water column | 1.13 ft H₂O |
| gigapascal | 0.00000339 GPa |
| kip per square inch | 0.000491 ksi |
| inch of mercury | 1 inHg |
| inch of water column | 13.6 in w.g. |
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 |