Bars to Atmospheres
A bar is close to average atmospheric pressure at sea level, widely used for tire pressure and industrial gauges in Europe. One atmosphere is the average air pressure at sea level, used as a reference unit in chemistry and physics. 1 bar equals ≈0.986923 atm, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to pressure, measured here against pressure's base unit (Pa) — every other pressure unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
atm = bar × ≈0.986923
bar = atm × 1.01325
Worked example: 5 bar × ≈0.986923 = ≈4.93462 atm.
Conversion table
| Bar (bar) | Atmosphere (atm) |
|---|---|
| 1 bar | ≈0.986923 atm |
| 2 bar | ≈1.97385 atm |
| 3 bar | ≈2.96077 atm |
| 5 bar | ≈4.93462 atm |
| 10 bar | ≈9.86923 atm |
| 20 bar | ≈19.7385 atm |
| 25 bar | ≈24.6731 atm |
| 50 bar | ≈49.3462 atm |
| 100 bar | ≈98.6923 atm |
| 250 bar | ≈246.731 atm |
| 500 bar | ≈493.462 atm |
| 1,000 bar | ≈986.923 atm |
Frequently asked
- How many Atmospheres in a bar?
- 1 bar equals ≈0.986923 atm.
- How do I convert Bars to Atmospheres?
- Multiply the value in bar by ≈0.986923 to get atm. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Bar and Atmosphere are both defined by a fixed conversion factor to pressure's base unit (Pa), so the result shown is exact to the precision displayed, not an approximation.