What this conversion means in practice
One atmosphere is defined as exactly 101,325 Pa; one bar is exactly 100,000 Pa. They are close cousins, which is why rough ‘1 atm ≈ 1 bar’ works for estimates but not for precision metrology.
The exact relationship here is 1 atm = 1.01325 bar, consistent with expressing both units relative to pascals (Pa).
How to convert standard atmosphere to bar
Multiply the standard atmosphere value by 1.01325 to get bar.
Example: 1 atm × 1.01325 = 1.01325 bar.
Standard atmosphere and Bar
This focused page locks to the unit pair above so you can quote or audit one factor without scrolling the full dropdown list. For context on other rows, open the parent converter from the site navigation.
Standard atmosphere to Bar conversion table
| Standard atmosphere (atm) | Bar (bar) |
|---|---|
| 0.1 atm | 0.101325 bar |
| 1 atm | 1.01325 bar |
| 2 atm | 2.0265 bar |
| 5 atm | 5.06625 bar |
| 10 atm | 10.1325 bar |
| 20 atm | 20.265 bar |
| 50 atm | 50.6625 bar |
| 100 atm | 101.325 bar |
Standard atmosphere to Bar FAQ
Atm versus bar in labs: when the percent difference matters and when it does not.
How do I convert atm to bar?
Multiply the value in atm by 1.01325 to obtain bar. That factor is the ratio of the two units in the same base system as the site’s full converter.
Is this factor the same as the main converter tool?
Yes. The numeric relationship uses the same unit definitions and base normalization as the corresponding converter on CalcRegistry.
Why might my hand calculation differ slightly?
Rounding after intermediate steps, display precision limits, or mixing alternate definitions (for example different “horsepower” variants) can shift the last digits. Use this page’s factor end-to-end for consistency.