Bar to Atmospheres
Convert bar to atmospheres instantly. 1 bar = 0.9869232667 atm. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert bar to atmospheres
To convert bar to atmospheres, divide by 1.01325 (multiply by 0.9869232667). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
atm = bar × 0.9869232667
Bar to Atmospheres conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Bar | Atmospheres |
|---|---|
| 1 bar | 0.986923 atm |
| 2 bar | 1.973847 atm |
| 3 bar | 2.96077 atm |
| 5 bar | 4.934616 atm |
| 10 bar | 9.869233 atm |
| 20 bar | 19.738465 atm |
| 25 bar | 24.673082 atm |
| 50 bar | 49.346163 atm |
| 100 bar | 98.692327 atm |
| 500 bar | 493.461633 atm |
| 1,000 bar | 986.923267 atm |
What is a bar?
Defined as exactly 100 kPa, very close to one atmosphere at sea level.
What is a atmosphere?
The standard atmosphere, defined as exactly 101,325 Pa.
The formula
atm = bar × 0.9869232667
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Bar to Atmospheres
- Type the number of bar you want to convert.
- Read the result in atmospheres straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked atmospheres to bar page.
Bar to Atmospheres — frequently asked questions
How many atmospheres are in a bar?
One bar equals 0.9869232667 atm. atm = bar × 0.9869232667
What is the formula to convert bar to atmospheres?
The formula is atm = bar × 0.9869232667. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert atmospheres back to bar?
Divide instead of multiplying: one atmosphere is 1.01325 bar. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this bar to atmospheres free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the bar to atmospheres.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error