Bar to Atmosphere Converter
One Bar equals 0.9869232667 Atmosphere (1 bar = 0.9869232667 atm). Multiply a Bar value by 0.9869232667 to get the equivalent in Atmosphere. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
atm = bar × 0.9869232667
Multiply the Bar value by 0.9869232667 to get the equivalent value in Atmosphere.
Example Conversions
1 Bar (bar)
0.9869232667 Atmosphere (atm)
5 Bar (bar)
4.934616334 Atmosphere (atm)
10 Bar (bar)
9.869232667 Atmosphere (atm)
25 Bar (bar)
24.67308167 Atmosphere (atm)
100 Bar (bar)
98.69232667 Atmosphere (atm)
Conversion Table
| Bar (bar) | Atmosphere (atm) |
|---|---|
| 0.1 | 0.09869232667 |
| 0.5 | 0.4934616334 |
| 1 | 0.9869232667 |
| 2 | 1.973846533 |
| 5 | 4.934616334 |
| 10 | 9.869232667 |
| 25 | 24.67308167 |
| 50 | 49.34616334 |
| 100 | 98.69232667 |
| 250 | 246.7308167 |
| 500 | 493.4616334 |
| 1000 | 986.9232667 |
How to Convert Manually
Use these steps to convert Bar values to Atmosphere without the calculator.
- Write down the value in Bar (bar) that you want to convert.
- Multiply that value by 0.9869232667.
- For example, 10 Bar × 0.9869232667 = 9.869232667 Atmosphere.
- Label the result as Atmosphere (atm).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Bar and one Atmosphere.
About Bar and Atmosphere
The bar is exactly 100,000 pascals, close to one atmosphere. European tire pressures, scuba tanks, and espresso machines are rated in 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. One Bar equals 0.9869232667 Atmosphere (1 bar = 0.9869232667 atm). Bar to Atmosphere conversion comes up most often in European tire pressures and in scuba diving tank pressure, typically when figures need restating for chemistry reference conditions.
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.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 Bar equals 14.803849 Atmosphere.
15 bar × 0.9869232667 = 14.803849 atm
FAQ
How do I convert Bar to Atmosphere?
Multiply the Bar value by 0.9869232667 to get the equivalent value in Atmosphere.
What is the formula for Bar to Atmosphere?
The formula is atm = bar × 0.9869232667.
How many Atmosphere are in 1 Bar?
1 Bar equals 0.9869232667 Atmosphere.
Can I convert Atmosphere back to Bar?
Yes. 1 Atmosphere equals 1.01325 Bar, and the related converter can reverse the calculation.
What are common names for Bar and Atmosphere?
Bar is shown as bar and may also be searched as bars. Atmosphere is shown as atm and may also be searched as atmospheres, standard atmosphere.
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