Atmospheres to Bar
Convert atmospheres to bar instantly. 1 atm = 1.01325 bar. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert atmospheres to bar
To convert atmospheres to bar, multiply by 1.01325. 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.
bar = atm × 1.01325
Atmospheres to Bar conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Atmospheres | Bar |
|---|---|
| 1 atm | 1.01325 bar |
| 2 atm | 2.0265 bar |
| 3 atm | 3.03975 bar |
| 5 atm | 5.06625 bar |
| 10 atm | 10.1325 bar |
| 20 atm | 20.265 bar |
| 25 atm | 25.33125 bar |
| 50 atm | 50.6625 bar |
| 100 atm | 101.325 bar |
| 500 atm | 506.625 bar |
| 1,000 atm | 1,013.25 bar |
What is a atmosphere?
The standard atmosphere, defined as exactly 101,325 Pa.
What is a bar?
Defined as exactly 100 kPa, very close to one atmosphere at sea level.
The formula
bar = atm × 1.01325
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 Atmospheres to Bar
- Type the number of atmospheres you want to convert.
- Read the result in bar 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 bar to atmospheres page.
Atmospheres to Bar — frequently asked questions
How many bar are in a atmosphere?
One atmosphere equals 1.01325 bar. bar = atm × 1.01325
What is the formula to convert atmospheres to bar?
The formula is bar = atm × 1.01325. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert bar back to atmospheres?
Divide instead of multiplying: one bar is 0.9869232667 atm. 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 atmospheres to bar 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 atmospheres to bar.
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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