100% free · No sign-up · Runs in your browser
Convert atmospheres to bar
Instant, accurate atm → bar conversion with a live converter, table and formula.
=
1 atmosphere = 1.01325 bar
1 bar = 0.986923 atmospheres
atmospheres to bar table
| atmospheres (atm) | bar (bar) |
|---|---|
| 0.5 | 0.506625 |
| 1 | 1.01325 |
| 2 | 2.0265 |
| 5 | 5.06625 |
| 10 | 10.1325 |
| 20 | 20.265 |
| 50 | 50.6625 |
| 100 | 101.325 |
| 500 | 506.625 |
| 1000 | 1013.25 |
Formula
bar = atmospheres × 1.01325.
Example
10 atmospheres = 10.1325 bar.
What is a atmosphere?
One atmosphere (atm) is standard sea-level pressure (101,325 Pa).
What is a bar?
A bar is 100,000 pascals — close to average sea-level air pressure.
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 | atmospheres | bar |
|---|---|---|
| Atmosphere (sea level) | 1 atm | 1.01 bar |
| Car tire (32 psi) | 2.18 atm | 2.21 bar |
| Road-bike tire (80 psi) | 5.44 atm | 5.52 bar |
| Espresso extraction (9 bar) | 8.88 atm | 9 bar |
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 bar in a atmospheres?+
1 atmosphere = 1.01325 bar.
How do I convert atmospheres to bar?+
Enter the value in the atmospheres box above and the bar value appears instantly. You can also type in the bar box to convert the other way.
Is this atm to bar converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.