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Convert bar to atmospheres
Instant, accurate bar → atm conversion with a live converter, table and formula.
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1 bar = 0.986923 atmospheres
1 atmosphere = 1.01325 bar
bar to atmospheres table
| bar (bar) | atmospheres (atm) |
|---|---|
| 0.5 | 0.493462 |
| 1 | 0.986923 |
| 2 | 1.97385 |
| 5 | 4.93462 |
| 10 | 9.86923 |
| 20 | 19.7385 |
| 50 | 49.3462 |
| 100 | 98.6923 |
| 500 | 493.462 |
| 1000 | 986.923 |
Formula
atmospheres = bar × 0.986923.
Example
10 bar = 9.86923 atmospheres.
What is a bar?
A bar is 100,000 pascals — close to average sea-level air pressure.
What is a atmosphere?
One atmosphere (atm) is standard sea-level pressure (101,325 Pa).
Real-world reference points
Sea-level air is ~1 bar (14.7 psi); car tires run ~2.2 bar (32 psi); espresso machines ~9 bar.
| Reference | bar | atmospheres |
|---|---|---|
| Atmosphere (sea level) | 1.01 bar | 1 atm |
| Car tire (32 psi) | 2.21 bar | 2.18 atm |
| Road-bike tire (80 psi) | 5.52 bar | 5.44 atm |
| Espresso extraction (9 bar) | 9 bar | 8.88 atm |
Mistakes to avoid with pressure conversions
- Mixing gauge and absolute pressure: tire gauges read pressure ABOVE atmospheric (psig), not absolute (psia).
- Inflating tires to the sidewall maximum instead of the door-jamb recommendation.
- Confusing bar with psi — a 2.2 vs 32 mixup is a dangerous under/over-inflation.
Frequently asked questions
How many atmospheres in a bar?+
1 bar = 0.986923 atmospheres.
How do I convert bar to atmospheres?+
Enter the value in the bar box above and the atmospheres value appears instantly. You can also type in the atmospheres box to convert the other way.
Is this bar to atm converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.