Convert Atmosphere to Bar

One atm equals 1.01325 bar. This converter allows you to easily convert between Atmosphere and Bar in real time.

Formula

atm × 1.01325 = bar

Example: 1 atm = 1.01325 bar

What is Atmosphere?

The standard atmosphere is a unit of pressure defined as exactly 101,325 pascals. It approximates the average atmospheric pressure at sea level on Earth. In diving, pressure increases by roughly 1 atm for every 10 meters of water depth, so at 30 meters the total pressure is about 4 atm. In chemistry, standard conditions for gases are defined at 0 degrees Celsius and 1 atm, making it a fundamental reference in thermodynamics and gas law calculations.

What is Bar?

The bar is a unit of pressure equal to 100,000 pascals, which is very close to standard atmospheric pressure (101,325 Pa). This convenient relationship makes it widely used in industry. Scuba tank pressure is typically around 200 bar, espresso machines extract at about 9 bar, and fire extinguishers are pressurized to several bar. While not an SI unit, the bar is accepted for use with the SI in many countries.