How to convert bars to atmospheres
atm = bar × 0.9869232667Because one standard atmosphere equals 1.01325 bars, you can also divide: atm = bar ÷ 1.01325.
A bar is smaller than a standard atmosphere: it takes 1.01325 bars to make one standard atmosphere.
Worked examples
- 1 bar1 bar × 0.9869232667 = 0.9869232667 atm
- 5 bars5 bar × 0.9869232667 = 4.934616334 atm
- 10 bars10 bar × 0.9869232667 = 9.869232667 atm
- 20 bars20 bar × 0.9869232667 = 19.73846533 atm
- 100 bars100 bar × 0.9869232667 = 98.69232667 atm
Bars to atmospheres conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Bars (bar) | Atmospheres (atm) |
|---|---|
| 0.1 bar | 0.098692327 atm |
| 0.25 bar | 0.24673082 atm |
| 0.5 bar | 0.49346163 atm |
| 1 bar | 0.98692327 atm |
| 2 bar | 1.9738465 atm |
| 3 bar | 2.9607698 atm |
| 4 bar | 3.9476931 atm |
| 5 bar | 4.9346163 atm |
| 6 bar | 5.9215396 atm |
| 7 bar | 6.9084629 atm |
| 8 bar | 7.8953861 atm |
| 9 bar | 8.8823094 atm |
| 10 bar | 9.8692327 atm |
| Bars (bar) | Atmospheres (atm) |
|---|---|
| 12 bar | 11.843079 atm |
| 15 bar | 14.803849 atm |
| 20 bar | 19.738465 atm |
| 25 bar | 24.673082 atm |
| 30 bar | 29.607698 atm |
| 40 bar | 39.476931 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 |
| 1,000 bar | 986.92327 atm |
About the units
Bar (bar)
Exactly 100,000 Pa, very close to one atmosphere. Common for tyres, scuba tanks and espresso machines (9 bar).
Standard atmosphere (atm)
Exactly 101,325 Pa — average sea-level air pressure.
Frequently asked questions
How many atmospheres are in one bar?
There are 0.9869232667 atmospheres in one bar, and this value is exact by definition.
How do I convert bars to atmospheres?
Multiply the number of bars by 0.9869232667. For example, 10 bar × 0.9869232667 = 9.869232667 atm.
How many bars are in one standard atmosphere?
One standard atmosphere equals 1.01325 bars. That is the reverse factor, 1 ÷ 0.9869232667.
What is 10 bars in atmospheres?
10 bar = 9.869232667 atm.
Is this bar to atm converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.