Atmosphere to Bar Converter (atm to bar)
1 atmosphere equals 1.01325 bar — multiply the number of atmospheres by 1.01325 to convert. This is the exact definition of the standard atmosphere in bar, so the two units are close but not identical.
The formula
To convert atmospheres to bar, multiply by 1.01325:
bar = atm × 1.01325
For example, 10 atm × 1.01325 = 10.1325 bar. To reverse it, divide by 1.01325 (or multiply by 0.98692327).
Conversion table
| Atmospheres (atm) | Bar |
|---|---|
| 1 | 1.01325 |
| 2 | 2.0265 |
| 3 | 3.03975 |
| 5 | 5.06625 |
| 10 | 10.1325 |
| 25 | 25.33125 |
| 50 | 50.6625 |
| 100 | 101.325 |
| 500 | 506.625 |
| 1000 | 1013.25 |
How to convert online
- Type the number of atmospheres into the first box.
- Read the bar value instantly in the second box.
- Enter a bar value to convert back to atmospheres — it works both ways.
Use the Atmosphere to Bar Converter — free and instant in your browser.
Where this conversion is used
Both atm and bar appear in weather, scuba diving, chemistry and industrial process specs. Because one atmosphere is 1.01325 bar, engineers often treat them as roughly equal for rough estimates but convert precisely for calibration, gauge readings and safety-critical pressure ratings.
FAQ
How many bar are in an atmosphere?
One atmosphere equals 1.01325 bar. So 10 atm is 10.1325 bar and 100 atm is 101.325 bar.
Is 1 atm the same as 1 bar?
No, but they are very close. 1 atm is 1.01325 bar, about 1.3% higher than 1 bar.
How do I convert bar back to atmospheres?
Divide by 1.01325, or multiply by 0.98692327. So 1 bar is about 0.987 atm.
Is this converter free and private?
Yes. It runs entirely in your browser — nothing is uploaded or stored. It is free, needs no sign-up and works offline once loaded.
Related converters
- Bar to Atmosphere Converter
- Atmosphere to Pascal Converter
- Atmosphere to Kilopascal Converter
- Atmosphere to PSI Converter
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Recommended reading
Bar to Atmosphere Converter (bar to atm)
1 bar equals 0.98692327 atmospheres. Use the exact factor, formula and reference table to convert bar to atm accurately.
Atmosphere to PSI Converter (atm to psi)
1 atmosphere equals 14.695949 psi. Use the exact factor, formula and reference table to convert atm to psi accurately.
Atmosphere to Pascal Converter (atm to Pa)
1 atmosphere equals 101,325 pascals. Use the exact factor, formula and reference table to convert atm to Pa accurately.
Atmosphere to Kilopascal Converter (atm to kPa)
1 atmosphere equals 101.325 kilopascals. Use the exact factor, formula and reference table to convert atm to kPa accurately.