Convert atmospheres to bar
Enter a value in atmospheres (atm) to get bar (bar). One standard atmosphere is 1.0132 bar; one bar is 0.986923 atmospheres.
How to use the Standard atmosphere to bar
- Type the number of atmospheres.
- Click Convert.
- Read the result in bar, plus the same value in every other pressure unit.
atm to bar formula
bar = atmospheres × 1.0132. To go the other way, atmospheres = bar × 0.986923 (see bar to atmospheres).
Worked example
12 atm × 1.0132 = 12.159 bar.
Atmospheres to bar conversion table
| Atmospheres | Bar |
|---|---|
| 0.1 atm | 0.101325 bar |
| 0.5 atm | 0.506625 bar |
| 1 atm | 1.0132 bar |
| 2 atm | 2.0265 bar |
| 3 atm | 3.0398 bar |
| 5 atm | 5.0663 bar |
| 10 atm | 10.1325 bar |
| 20 atm | 20.265 bar |
| 25 atm | 25.3313 bar |
| 50 atm | 50.6625 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 standard atmosphere
Mean sea-level air pressure, exactly 101,325 Pa.
About the bar
Almost exactly one atmosphere. Tyres, scuba tanks and espresso machines in Europe.
Related conversions
Frequently asked questions
How many bar in a standard atmosphere?
1.0132 bar.
How many atmospheres in a bar?
0.986923 atmospheres.
Is the factor exact?
The factor 1.0132 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.