Convert bar to atmosphere
1 bar = 0.9869232667 atm
sig figs
1 bar = 0.987 atm
1 bar in every pressure unit
| microbar | 1,000,000 μbar |
| barye | 1,000,000 Ba |
| millitorr | 750,000 mTorr |
| pascal | 100,000 Pa |
| millimeter of water column | 10,200 mmH₂O |
| pound per square foot | 2,090 lb/ft² |
| centimeter of water column | 1,020 cmH₂O |
| hectopascal | 1,000 hPa |
| millibar | 1,000 mbar |
| torr | 750 Torr |
| millimeter of mercury | 750 mmHg |
| inch of water column | 401 in w.g. |
| kilopascal | 100 kPa |
| foot of water column | 33.5 ft H₂O |
| inch of mercury | 29.5 inHg |
| pound per square inch | 14.5 psi |
| meter of water column | 10.2 m H₂O |
| decibar | 10 dbar |
| kilogram-force per square centimeter | 1.02 kgf/cm² |
| bar | 1 bar |
| atmosphere | 0.987 atm |
| megapascal | 0.1 MPa |
| kip per square inch | 0.0145 ksi |
| gigapascal | 0.0001 GPa |
| million pounds per square inch | 0.0000145 Mpsi |
How the conversion works
Multiply by 0.9869232667 to go from bar 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 bar: 1 atm = 1.01325 bar.
bar to atmosphere: common values
| 1 bar | 0.98692327 atm |
| 2 bar | 1.9738465 atm |
| 3 bar | 2.9607698 atm |
| 5 bar | 4.9346163 atm |
| 10 bar | 9.8692327 atm |
| 15 bar | 14.803849 atm |
| 20 bar | 19.738465 atm |
| 25 bar | 24.673082 atm |
| 50 bar | 49.346163 atm |
| 75 bar | 74.019245 atm |
| 100 bar | 98.692327 atm |
| 250 bar | 246.73082 atm |
| 500 bar | 493.46163 atm |
| 1000 bar | 986.92327 atm |