Convert bar to atmospheres
Converting bar to atmospheres is a common pressure task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 bar equals 0.986923 atm, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert bar to atmospheres
To convert bar to atmospheres, multiply the number of bar by 0.986923. For example, 10 bar × 0.986923 = 9.86923 atm.
atm = bar × 0.986923
- Write down the value in bar you want to convert.
- Multiply it by 0.986923 (the exact bar→atm factor).
- The result is your value in atmospheres. Check it below with the converter or the table.
Conversion table
Common values of bar and their equivalents in atmospheres:
| bar | atm |
|---|---|
| 1 | 0.986923 |
| 2 | 1.97385 |
| 3 | 2.96077 |
| 4 | 3.94769 |
| 5 | 4.93462 |
| 10 | 9.86923 |
| 20 | 19.7385 |
| 25 | 24.6731 |
| 50 | 49.3462 |
| 100 | 98.6923 |
| 250 | 246.731 |
| 500 | 493.462 |
About these units
Bar (bar). A bar equals exactly 100,000 pascals, close to average atmospheric pressure at sea level. It is the standard unit for tire pressure, dive tanks and espresso machines in metric countries.
Atmosphere (atm). One standard atmosphere is defined as exactly 101,325 pascals, the reference average pressure of Earth's atmosphere at sea level. It anchors chemistry and gas-law calculations.
Frequently asked questions
How do I convert bar to atmospheres?
To convert bar to atmospheres, multiply the number of bar by 0.986923. For example, 10 bar × 0.986923 = 9.86923 atm. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many atmospheres are in 1 bar?
1 bar = 0.986923 atm. That is the fixed relationship used by this converter and by international standards.
How many bar are in 1 atmosphere?
1 atm = 1.01325 bar. If you are converting in the opposite direction, use our Atmosphere to Bar converter for the dedicated table and FAQ.
Is the bar to atmospheres conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.986923 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is bar used for?
A bar equals exactly 100,000 pascals, close to average atmospheric pressure at sea level. It is the standard unit for tire pressure, dive tanks and espresso machines in metric countries.