Convert inch of mercury to pascal
1 inHg = 3,386.38864 Pa
sig figs
1 inHg = 3,390 Pa
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 3,386.38864 to go from inch of mercury to pascal, 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? pascal to inch of mercury: 1 Pa = 0.000295299833 inHg.
inch of mercury to pascal: common values
| 1 inHg | 3,386.3886 Pa |
| 2 inHg | 6,772.7773 Pa |
| 3 inHg | 10,159.166 Pa |
| 5 inHg | 16,931.943 Pa |
| 10 inHg | 33,863.886 Pa |
| 15 inHg | 50,795.83 Pa |
| 20 inHg | 67,727.773 Pa |
| 25 inHg | 84,659.716 Pa |
| 50 inHg | 169,319.43 Pa |
| 75 inHg | 253,979.15 Pa |
| 100 inHg | 338,638.86 Pa |
| 250 inHg | 846,597.16 Pa |
| 500 inHg | 1,693,194.3 Pa |
| 1000 inHg | 3,386,388.6 Pa |