What this conversion means in practice
Bar values from instrumentation sometimes need atm for legacy chemistry tables, STP discussions, or textbook exercises that still phrase limits in atmospheres.
The exact relationship here is 1 bar = 0.986923266716 atm, consistent with expressing both units relative to pascals (Pa).
How to convert bar to standard atmosphere
Multiply the bar value by 0.986923266716 to get standard atmosphere.
Example: 1 bar × 0.986923266716 = 0.986923266716 atm.
Bar and Standard atmosphere
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.
Bar to Standard atmosphere conversion table
| Bar (bar) | Standard atmosphere (atm) |
|---|---|
| 0.1 bar | 0.098692326672 atm |
| 1 bar | 0.986923266716 atm |
| 2 bar | 1.973846533432 atm |
| 5 bar | 4.93461633358 atm |
| 10 bar | 9.86923266716 atm |
| 20 bar | 19.73846533432 atm |
| 50 bar | 49.346163335801 atm |
| 100 bar | 98.692326671601 atm |
Bar to Standard atmosphere FAQ
Bar to atm for STP-style calculations and cross-checking vacuum versus overpressure notation.
How do I convert bar to atm?
Multiply the value in bar by 0.986923266716 to obtain atm. 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.