How to convert atmospheres to bars
To convert atmospheres to bars, multiply the value by the conversion factor 1.01325. To go the other way, multiply by 0.9869232667 (or divide by 1.01325).
Worked example: 30 atm to bar
- Write the value: 30 atm
- Multiply by 1.01325: 30 × 1.01325
- Result: 30.3975 bar
Atmosphere to Bar conversion table
Quick reference values, rounded to 6 significant digits.
| Atmosphere (atm) | Bar (bar) |
|---|---|
| 0.1 atm | 0.101325 bar |
| 0.25 atm | 0.253313 bar |
| 0.5 atm | 0.506625 bar |
| 1 atm | 1.01325 bar |
| 2 atm | 2.0265 bar |
| 3 atm | 3.03975 bar |
| 4 atm | 4.053 bar |
| 5 atm | 5.06625 bar |
| 6 atm | 6.0795 bar |
| 7 atm | 7.09275 bar |
| 8 atm | 8.106 bar |
| 9 atm | 9.11925 bar |
| 10 atm | 10.1325 bar |
| 12 atm | 12.159 bar |
| 15 atm | 15.1988 bar |
| 20 atm | 20.265 bar |
| 25 atm | 25.3313 bar |
| 30 atm | 30.3975 bar |
| 40 atm | 40.53 bar |
| 50 atm | 50.6625 bar |
| 75 atm | 75.9938 bar |
| 100 atm | 101.325 bar |
| 250 atm | 253.313 bar |
| 500 atm | 506.625 bar |
| 1,000 atm | 1,013.25 bar |
Bar to Atmosphere
| bar | atm |
|---|---|
| 1 bar | 0.986923 atm |
| 5 bar | 4.93462 atm |
| 10 bar | 9.86923 atm |
| 50 bar | 49.3462 atm |
| 100 bar | 98.6923 atm |
1 Atmosphere in other pressure units
About Atmosphere and Bar
What is a atmosphere (atm)?
A standard atmosphere is 101,325 Pa, the average air pressure at sea level.
What is a bar (bar)?
One bar equals 100,000 Pa, close to atmospheric pressure at sea level.
Where atmosphere to bar conversion is used
Pressure conversions are needed for tyre pressure, weather, gas cylinders, medical devices and engineering. Converting between atmospheres and bars is especially common when you compare products, read foreign specifications, or fill in forms that expect a specific unit.
Need every unit at once? Use the full Pressure Converter.
Frequently asked questions
How many bars are in 1 atmosphere?
1 Atmosphere equals 1.01325 bar.
How do I convert atmospheres to bars?
Multiply the number of atmospheres by 1.01325. For example, 30 atm × 1.01325 = 30.3975 bar.
What is 30 atm in bar?
30 atm = 30.3975 bar.
How many atmospheres are in 1 bar?
1 Bar equals 0.986923 atm. Use the Bar to ATM converter for the reverse direction.
Is this Atmosphere to Bar converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.