Convert millimeter of mercury to atmosphere
1 mmHg = 0.001315789661 atm
1 mmHg = 0.0013158 atm
1 mmHg in every pressure unit
| microbar | 1,333.2 μbar |
| barye | 1,333.2 Ba |
| millitorr | 1,000 mTorr |
| pascal | 133.32 Pa |
| millimeter of water column | 13.595 mmH₂O |
| pound per square foot | 2.7845 lb/ft² |
| centimeter of water column | 1.3595 cmH₂O |
| hectopascal | 1.3332 hPa |
| millibar | 1.3332 mbar |
| torr | 1 Torr |
| millimeter of mercury | 1 mmHg |
| inch of water column | 0.53524 in w.g. |
| kilopascal | 0.13332 kPa |
| foot of water column | 0.044603 ft H₂O |
| inch of mercury | 0.03937 inHg |
| pound per square inch | 0.019337 psi |
| meter of water column | 0.013595 m H₂O |
| decibar | 0.013332 dbar |
| kilogram-force per square centimeter | 0.0013595 kgf/cm² |
| bar | 0.0013332 bar |
| atmosphere | 0.0013158 atm |
| megapascal | 0.00013332 MPa |
| kip per square inch | 0.000019337 ksi |
| gigapascal | 1.3332e-07 GPa |
| million pounds per square inch | 1.9337e-08 Mpsi |
How the conversion works
Multiply by 0.001315789661 to go from millimeter 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 millimeter of mercury — 1 atm = 759.9998917 mmHg.
millimeter of mercury to atmosphere — common values
| 1 mmHg | 0.0013157897 atm |
| 2 mmHg | 0.0026315793 atm |
| 3 mmHg | 0.003947369 atm |
| 5 mmHg | 0.0065789483 atm |
| 10 mmHg | 0.013157897 atm |
| 15 mmHg | 0.019736845 atm |
| 20 mmHg | 0.026315793 atm |
| 25 mmHg | 0.032894742 atm |
| 50 mmHg | 0.065789483 atm |
| 75 mmHg | 0.098684225 atm |
| 100 mmHg | 0.13157897 atm |
| 250 mmHg | 0.32894742 atm |
| 500 mmHg | 0.65789483 atm |
| 1000 mmHg | 1.3157897 atm |