Pressure
atmtobar
Convert standard atmospheres (atm) to bar (bar).
Factor1 atm = 1.01325 bar
Converter
atm
Accepts numbers or expressions, e.g. 150 + 14.7
Result
bar
Rendered to 6 significant figures.
Formula
Formula
bar = atm × 1.01325
Multiply any value in standard atmospheres by 1.01325 to obtain the value in bar.
Worked example
Convert 1 atm to bar.
- 01Start with 1 atm.
- 02Multiply by the conversion factor: 1 × 1.01325 = 1.01325 bar.
Result1 atm = 1.01325 bar
Conversion table
| atm | bar |
|---|---|
| 1 | 1.0132 |
| 2 | 2.0265 |
| 5 | 5.0663 |
| 10 | 10.133 |
| 20 | 20.265 |
| 50 | 50.663 |
| 100 | 101.33 |
| 200 | 202.65 |
| 500 | 506.63 |
| 1000 | 1013.3 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from atm to bar?
1 atm equals 1.01325 bar. To convert, multiply the value in standard atmospheres by 1.01325.
How do I convert 1 atm to bar?
1 atm = 1.01325 bar. For any value, multiply by 1.01325.
How do I convert bar back to atm?
Divide by the same factor — or equivalently, multiply by 0.9869233. So 1 bar = 0.986923 atm.
When would I need to convert standard atmosphere to bar?
Pressure conversions between atm and bar are common when working with mixed-vendor instrumentation, when piping codes use different units to process datasheets, or when converting field readings into SI for hydraulic calculations.
Is the conversion exact?
Yes. Both atm and bar are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).