Bar to atmospheres
Type a value in bar to see it in atmospheres straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the bar box.
- Read the result in atmospheres as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
atm = bar × 0.9869232667
Multiply the value in bar by 0.9869232667 to get atmospheres.
Example
To convert 25 bar to atmospheres: 25 × 0.9869232667 = 24.6731 atm.
Conversion table
| Bar (bar) | Atmospheres (atm) |
|---|---|
| 1 | 0.986923 |
| 2 | 1.97385 |
| 3 | 2.96077 |
| 5 | 4.93462 |
| 10 | 9.86923 |
| 20 | 19.7385 |
| 25 | 24.6731 |
| 50 | 49.3462 |
| 100 | 98.6923 |
| 250 | 246.731 |
| 500 | 493.462 |
| 1,000 | 986.923 |
About the units
- Bar
- A metric unit equal to exactly 100,000 pascals, close to atmospheric pressure at sea level.
- Atmosphere
- The standard atmosphere, defined as exactly 101,325 pascals.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many atmospheres are in one bar?
1 bar = 0.986923 atm exactly.
How do I convert bar to atmospheres?
Use atm = bar × 0.9869232667. For example, 25 bar = 24.6731 atm.
How many bar are in one atmosphere?
1 atm = 1.01325 bar.
What is the difference between gauge and absolute pressure?
Gauge pressure is measured from the surrounding air pressure, while absolute pressure starts from a perfect vacuum. These converters change the unit only, so a gauge reading stays a gauge reading.
Are torr and mmHg the same?
Almost. One torr is 101325/760 Pa, about 133.322368 Pa, and one conventional mmHg is 133.322387 Pa, a difference of less than one part per million. For everyday use you can treat them as equal.