Atmospheres to Bar Converter
How to convert atmospheres to bar
bar = atmospheres × 1.01325
To convert atmospheres to bar, multiply the number of atmospheres by 1.01325.
1 atm = 1.01325 bar
Examples
- Standard sea-level atmospheric pressure: 1 atm × 1.01325 = 1.01325 bar
- 2 atm × 1.01325 = 2.0265 bar
Good to know
The two are close but not equal: 1 atm is exactly 1.01325 bar, and 1 bar is about 0.987 atm.
This is the standard atmosphere (atm), exactly 101,325 Pa. It is not the technical atmosphere (at), which is 1 kgf/cm² or 98,066.5 Pa.
Atmospheres to bar conversion table
| Atmospheres (atm) | Bar |
|---|---|
| 0.1 atm | 0.101325 bar |
| 0.25 atm | 0.2533125 bar |
| 0.5 atm | 0.506625 bar |
| 0.75 atm | 0.7599375 bar |
| 1 atm | 1.01325 bar |
| 1.5 atm | 1.519875 bar |
| 2 atm | 2.0265 bar |
| 3 atm | 3.03975 bar |
| 4 atm | 4.053 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 |
Unit definitions
- Atmosphere (atm)
- The standard atmosphere is defined as exactly 101,325 pascals, approximately the average air pressure at sea level. It is used as a reference pressure in chemistry and physics.
- Bar
- A bar is exactly 100,000 pascals, slightly less than average atmospheric pressure at sea level. It is widely used in Europe for tire pressures, weather and industrial equipment.