How to convert atmospheres to bars
bar = atm × 1.01325Multiply the value in atmospheres by 1.01325. To go the other way, multiply by 0.9869232667 (or divide by 1.01325).
A standard atmosphere is larger than a bar: one standard atmosphere contains 1.01325 bars.
Worked examples
- 1 standard atmosphere1 atm × 1.01325 = 1.01325 bar
- 5 atmospheres5 atm × 1.01325 = 5.06625 bar
- 10 atmospheres10 atm × 1.01325 = 10.1325 bar
- 20 atmospheres20 atm × 1.01325 = 20.265 bar
- 100 atmospheres100 atm × 1.01325 = 101.325 bar
Atmospheres to bars conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Atmospheres (atm) | Bars (bar) |
|---|---|
| 0.1 atm | 0.101325 bar |
| 0.25 atm | 0.2533125 bar |
| 0.5 atm | 0.506625 bar |
| 1 atm | 1.01325 bar |
| 2 atm | 2.0265 bar |
| 3 atm | 3.03975 bar |
| 4 atm | 4.053 bar |
| 5 atm | 5.06625 bar |
| 6 atm | 6.0795 bar |
| 7 atm | 7.09275 bar |
| 8 atm | 8.106 bar |
| 9 atm | 9.11925 bar |
| 10 atm | 10.1325 bar |
| Atmospheres (atm) | Bars (bar) |
|---|---|
| 12 atm | 12.159 bar |
| 15 atm | 15.19875 bar |
| 20 atm | 20.265 bar |
| 25 atm | 25.33125 bar |
| 30 atm | 30.3975 bar |
| 40 atm | 40.53 bar |
| 50 atm | 50.6625 bar |
| 75 atm | 75.99375 bar |
| 100 atm | 101.325 bar |
| 250 atm | 253.3125 bar |
| 500 atm | 506.625 bar |
| 1,000 atm | 1,013.25 bar |
About the units
Standard atmosphere (atm)
Exactly 101,325 Pa — average sea-level air pressure.
Bar (bar)
Exactly 100,000 Pa, very close to one atmosphere. Common for tyres, scuba tanks and espresso machines (9 bar).
Frequently asked questions
How many bars are in one standard atmosphere?
There are 1.01325 bars in one standard atmosphere, and this value is exact by definition.
How do I convert atmospheres to bars?
Multiply the number of atmospheres by 1.01325. For example, 10 atm × 1.01325 = 10.1325 bar.
How many atmospheres are in one bar?
One bar equals 0.9869232667 atmospheres. That is the reverse factor, 1 ÷ 1.01325.
What is 10 atmospheres in bars?
10 atm = 10.1325 bar.
Is this atm to bar 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.