Atmospheres to Bars Converter
One Atmosphere equals 1.01325 Bars (1 atm = 1.01325 bar). Multiply an Atmosphere value by 1.01325 to get the equivalent in Bars. Enter a value above to calculate the result. You can also use the formula and reference table below.
Formula
bar = atm × 1.01325
Multiply the Atmosphere value by 1.01325 to get the equivalent value in Bars.
Example Conversions
1 Atmosphere (atm)
1.01325 Bar (bar)
5 Atmosphere (atm)
5.06625 Bar (bar)
10 Atmosphere (atm)
10.1325 Bar (bar)
25 Atmosphere (atm)
25.33125 Bar (bar)
100 Atmosphere (atm)
101.325 Bar (bar)
Conversion Table
| Atmosphere (atm) | Bar (bar) |
|---|---|
| 0.1 | 0.101325 |
| 0.5 | 0.506625 |
| 1 | 1.01325 |
| 2 | 2.0265 |
| 5 | 5.06625 |
| 10 | 10.1325 |
| 25 | 25.33125 |
| 50 | 50.6625 |
| 100 | 101.325 |
| 250 | 253.3125 |
| 500 | 506.625 |
| 1000 | 1013.25 |
How to Convert Manually
Use these steps to convert Atmosphere values to Bar without the calculator.
- Write down the value in Atmosphere (atm) that you want to convert.
- Multiply that value by 1.01325.
- For example, 10 Atmospheres × 1.01325 = 10.1325 Bars.
- Label the result as Bar (bar).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Atmosphere and one Bar.
About Atmosphere and Bar
The standard atmosphere is defined as exactly 101,325 pascals, mean sea-level air pressure. Chemistry reference conditions and diving depth calculations use atmospheres. The bar is exactly 100,000 pascals, close to one atmosphere. European tire pressures, scuba tanks, and espresso machines are rated in bar. One Atmosphere equals 1.01325 Bars (1 atm = 1.01325 bar). Atmosphere is used in chemistry reference conditions and in diving depth pressure. Bar is used in European tire pressures.
Precision and Rounding:Several pressure factors are exact by definition (1 atm = 101,325 Pa; 1 bar = 100,000 Pa) while others, like psi and mmHg, are derived and carry long decimals. Tire and weather readings tolerate whole-number rounding; calibration, medicine, and process engineering need the full factor before rounding.
Use the pressure conversion guide to compare mmHg, mbar, inHg, kPa, Pa, and torr across medical, weather, aviation, vacuum, and engineering work.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Atmospheres equals15.19875Bars.
15 atm × 1.01325 = 15.19875 bar
FAQ
How do I convert Atmosphere to Bar?
Multiply the Atmosphere value by 1.01325 to get the equivalent value in Bars.
What is the formula for Atmosphere to Bar?
The formula is bar = atm × 1.01325.
How many Bars are in 1 Atmosphere?
1 Atmosphere equals 1.01325 Bars.
Can I convert Bar back to Atmosphere?
Yes. 1 Bar equals 0.9869232667 Atmospheres, and the related converter can reverse the calculation.
What are common names for Atmosphere and Bar?
Atmosphere is shown as atm and may also be searched as atmospheres, standard atmosphere. Bar is shown as bar and may also be searched as bars.
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