Convert inch of mercury to megapascal
1 inHg = 0.00338638864 MPa
sig figs
1 inHg = 0.00339 MPa
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 0.00338638864 to go from inch of mercury to megapascal, 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? megapascal to inch of mercury: 1 MPa = 295.299833 inHg.
inch of mercury to megapascal: common values
| 1 inHg | 0.0033863886 MPa |
| 2 inHg | 0.0067727773 MPa |
| 3 inHg | 0.010159166 MPa |
| 5 inHg | 0.016931943 MPa |
| 10 inHg | 0.033863886 MPa |
| 15 inHg | 0.05079583 MPa |
| 20 inHg | 0.067727773 MPa |
| 25 inHg | 0.084659716 MPa |
| 50 inHg | 0.16931943 MPa |
| 75 inHg | 0.25397915 MPa |
| 100 inHg | 0.33863886 MPa |
| 250 inHg | 0.84659716 MPa |
| 500 inHg | 1.6931943 MPa |
| 1000 inHg | 3.3863886 MPa |