1 bar equals about
0,9869 atmospheres
The bar and the atmosphere (atm) are two very similar pressure units, both close to the average atmospheric pressure at sea level. The atmosphere is defined exactly as 101,325 Pa, while the bar is defined as 100,000 Pa: because of this, a bar is slightly less than an atmosphere.
To convert a measurement from bar to atmospheres, simply multiply the value by 0.9869:
To convert from atmospheres to bar, perform the inverse operation, multiplying by 1.01325:
This conversion is useful for those comparing technical specifications of pressure equipment, scuba diving (where pressure increases by about 1 atmosphere every 10 meters of depth), or weather reports that sometimes use different units to report atmospheric pressure.