Convert inch of mercury to bar
1 inHg = 0.0338638864 bar
sig figs
1 inHg = 0.0339 bar
1 inHg in every pressure unit
| microbar | 33,900 μbar |
| barye | 33,900 Ba |
| millitorr | 25,400 mTorr |
| pascal | 3,390 Pa |
| millimeter of water column | 345 mmH₂O |
| pound per square foot | 70.7 lb/ft² |
| centimeter of water column | 34.5 cmH₂O |
| hectopascal | 33.9 hPa |
| millibar | 33.9 mbar |
| torr | 25.4 Torr |
| millimeter of mercury | 25.4 mmHg |
| inch of water column | 13.6 in w.g. |
| kilopascal | 3.39 kPa |
| foot of water column | 1.13 ft H₂O |
| inch of mercury | 1 inHg |
| pound per square inch | 0.491 psi |
| meter of water column | 0.345 m H₂O |
| decibar | 0.339 dbar |
| kilogram-force per square centimeter | 0.0345 kgf/cm² |
| bar | 0.0339 bar |
| atmosphere | 0.0334 atm |
| megapascal | 0.00339 MPa |
| kip per square inch | 0.000491 ksi |
| gigapascal | 0.00000339 GPa |
| million pounds per square inch | 4.91e-07 Mpsi |
Worth knowing
inch of mercury: Engine vacuum and vacuum-system readings in inHg are usually measured downward from atmosphere, so "20 inches of vacuum" means about 9.9 inHg absolute, not 20. Aviation and weather use inHg absolute. Read which convention the instrument uses before converting. Full definition →
How the conversion works
Multiply by 0.0338638864 to go from inch of mercury to bar, 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? bar to inch of mercury: 1 bar = 29.5299833 inHg.
inch of mercury to bar: common values
| 1 inHg | 0.033863886 bar |
| 2 inHg | 0.067727773 bar |
| 3 inHg | 0.10159166 bar |
| 5 inHg | 0.16931943 bar |
| 10 inHg | 0.33863886 bar |
| 15 inHg | 0.5079583 bar |
| 20 inHg | 0.67727773 bar |
| 25 inHg | 0.84659716 bar |
| 50 inHg | 1.6931943 bar |
| 75 inHg | 2.5397915 bar |
| 100 inHg | 3.3863886 bar |
| 250 inHg | 8.4659716 bar |
| 500 inHg | 16.931943 bar |
| 1000 inHg | 33.863886 bar |