Convert atmosphere to millimeter of mercury
1 atm = 759.9998917 mmHg
sig figs
1 atm = 760 mmHg
1 atm in every pressure unit
| microbar | 1,010,000 μbar |
| barye | 1,010,000 Ba |
| millitorr | 760,000 mTorr |
| pascal | 101,000 Pa |
| millimeter of water column | 10,300 mmH₂O |
| pound per square foot | 2,120 lb/ft² |
| centimeter of water column | 1,030 cmH₂O |
| hectopascal | 1,010 hPa |
| millibar | 1,010 mbar |
| torr | 760 Torr |
| millimeter of mercury | 760 mmHg |
| inch of water column | 407 in w.g. |
| kilopascal | 101 kPa |
| foot of water column | 33.9 ft H₂O |
| inch of mercury | 29.9 inHg |
| pound per square inch | 14.7 psi |
| meter of water column | 10.3 m H₂O |
| decibar | 10.1 dbar |
| kilogram-force per square centimeter | 1.03 kgf/cm² |
| bar | 1.01 bar |
| atmosphere | 1 atm |
| megapascal | 0.101 MPa |
| kip per square inch | 0.0147 ksi |
| gigapascal | 0.000101 GPa |
| million pounds per square inch | 0.0000147 Mpsi |
Worth knowing
millimeter of mercury: The torr and the millimetre of mercury are not identical. The torr is defined as exactly 1/760 of a standard atmosphere, or 133.3223684... Pa, while mmHg is 133.322387415 Pa. They differ by about one part in seven million, which is irrelevant for blood pressure and can matter in precision vacuum metrology. Full definition →
How the conversion works
Multiply by 759.9998917 to go from atmosphere to millimeter of mercury, 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? millimeter of mercury to atmosphere: 1 mmHg = 0.001315789661 atm.
atmosphere to millimeter of mercury: common values
| 1 atm | 759.99989 mmHg |
| 2 atm | 1,519.9998 mmHg |
| 3 atm | 2,279.9997 mmHg |
| 5 atm | 3,799.9995 mmHg |
| 10 atm | 7,599.9989 mmHg |
| 15 atm | 11,399.998 mmHg |
| 20 atm | 15,199.998 mmHg |
| 25 atm | 18,999.997 mmHg |
| 50 atm | 37,999.995 mmHg |
| 75 atm | 56,999.992 mmHg |
| 100 atm | 75,999.989 mmHg |
| 250 atm | 189,999.97 mmHg |
| 500 atm | 379,999.95 mmHg |
| 1000 atm | 759,999.89 mmHg |
Other pressure conversions
Pa → mmHgkPa → mmHgMPa → mmHgbar → mmHgatm → Paatm → kPaatm → MPaatm → bar