1 atm equals 1.01325 bar. To convert atm to bar, multiply the value by 1.01325; divide by 1.01325 to convert back. Enter any number above and the result appears instantly — free and entirely in your browser.
How do you convert atm to bar?
The conversion formula is bar = atm × 1.01325. The conversion factor is fixed by definition, so the result is always exact.
atm to bar conversion table
| atm | bar |
|---|---|
| 1 atm | 1.01325 bar |
| 2 atm | 2.0265 bar |
| 5 atm | 5.06625 bar |
| 10 atm | 10.1325 bar |
| 20 atm | 20.265 bar |
| 50 atm | 50.6625 bar |
What is atm (atm)?
The standard atmosphere (atm) is defined as exactly 101,325 pascals — roughly the average air pressure at sea level. It serves as a reference value in chemistry and physics.
What is bar (bar)?
The bar is a metric pressure unit equal to exactly 100,000 pascals — very close to average air pressure at sea level. It is widely used across Europe for tyre pressure, weather reports and industrial systems.
Why convert atm to bar?
Pressure units differ by region and field: Europe uses bar, the US uses psi, science uses pascals and kilopascals, and medicine still uses mmHg. Converting between them is a daily need for mechanics, engineers and divers.
Standard atmospheric pressure is defined as exactly 101,325 Pa — equal to 1.01325 bar or 14.696 psi (BIPM/NIST). Car tyres are typically inflated to about 2.2–2.5 bar (32–36 psi).
How to convert atm to bar
- Enter the value in atm into the left field of the converter.
- Read the result in bar instantly in the right field — it updates automatically.
- Use the swap button to reverse the direction (bar to atm).
The converter runs entirely in your browser: no uploads, no queue, no limits. You can even use it offline.