Quick answer: 1 Atmosphere (atm) in Bar
1 atm equals 1.01325 bar. To convert Atmosphere (atm) to Bar, multiply by 1.01325 using the free calculator above — no signup needed.
Pressure units
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About Pressure Converter
The Pressure Converter converts between 6 different units, including Pascal, Kilopascal, Bar, PSI (lbf/in²), Atmosphere (atm). The base unit is the Pascal, and every other unit on this page is defined as an exact multiple of it. Type any value into the calculator above to convert instantly — free, unlimited, no signup and nothing to install.
Common equivalents: 1 Pascal = 0.001 Kilopascal, 0.00001 Bar, 0.000145038 PSI (lbf/in²).
Scale of this category: the smallest unit is the Pascal (Pa) and the largest is the Atmosphere (atm) (atm).
Last updated: 2026-09-15
Pressure conversion factors
| Unit | Symbol | Value in Pascal |
|---|---|---|
| Pascal | Pa | 1 Pa = 1 Pa |
| Kilopascal | kPa | 1 kPa = 1000 Pa |
| Bar | bar | 1 bar = 100000 Pa |
| PSI (lbf/in²) | psi | 1 psi = 6894.76 Pa |
| Atmosphere (atm) | atm | 1 atm = 101325 Pa |
| Torr / mmHg | Torr | 1 Torr = 133.322368 Pa |
Worked Examples
See exactly how the conversion works with real numbers, step by step.
How much is 1 Atmosphere (atm) in Bar?
- Multiply 1 by the conversion factor 1.01325
- 1 Atmosphere (atm) = 1.01325 Bar
How much is 5 Atmosphere (atm) in Bar?
- Multiply 5 by the conversion factor 1.01325
- 5 Atmosphere (atm) = 5.06625 Bar
How much is 25 Atmosphere (atm) in Bar?
- Multiply 25 by the conversion factor 1.01325
- 25 Atmosphere (atm) = 25.33125 Bar
Quick Conversion Reference Table
| Atmosphere (atm) (atm) | Bar (bar) |
|---|---|
| 1 atm (Atmosphere (atm)) | 1.01325 bar (Bar) |
| 2 atm (Atmosphere (atm)) | 2.0265 bar (Bar) |
| 5 atm (Atmosphere (atm)) | 5.06625 bar (Bar) |
| 10 atm (Atmosphere (atm)) | 10.1325 bar (Bar) |
| 20 atm (Atmosphere (atm)) | 20.265 bar (Bar) |
| 50 atm (Atmosphere (atm)) | 50.6625 bar (Bar) |
| 100 atm (Atmosphere (atm)) | 101.325 bar (Bar) |
| 500 atm (Atmosphere (atm)) | 506.625 bar (Bar) |
| 1000 atm (Atmosphere (atm)) | 1013.25 bar (Bar) |
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How to Use This Converter
- Enter your value
Type any number into the input field above. The result updates instantly as you type — no button needed.
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FAQ
How much is 1 Atmosphere (atm) in Bar?
1 Atmosphere (atm) = 1.01325 Bar.
How do I convert Atmosphere (atm) to Bar?
Enter your value in Atmosphere (atm) into the converter above and the result in Bar appears instantly. 1 atm equals 1.01325 bar — just multiply your value by 1.01325.
What is the formula for Atmosphere (atm) to Bar?
The formula is: value in Bar = value in Atmosphere (atm) × 1.01325. For example, 5 atm × 1.01325 = 5.06625 bar.
Is this Atmosphere (atm) to Bar converter free and accurate?
Yes. This Atmosphere (atm) to Bar converter is 100% free, uses the exact international conversion factor (1.01325), and works on any device with no signup.
How do I convert Bar back to Atmosphere (atm)?
To convert back, divide by 1.01325 (or multiply by 0.986923). You can also use our dedicated How Many Atmosphere (atm) in 1 Bar? page for instant results.
Do I need to download an app or sign up?
No. The converter runs entirely in your browser — nothing to install, no account, no fees. It even keeps working offline once the page has loaded.
Which Pressure units are supported?
This converter supports 6 units: Pascal, Kilopascal, Bar, PSI (lbf/in²), Atmosphere (atm), Torr / mmHg.