Atmosphere Conversions
Use this easy and mobile-friendly calculator to convert between Atmospheres and other units of Pressure.From
To
swap units ↺
1 Atmosphere =
1,013.25 Millibars
exact result
Decimal places
Atmospheres
An atmosphere of pressure, or atm, is the pressure exerted by the Earth's atmosphere at sea level. Since this number varies, a standard atmosphere is defined as 101,325 pascals.
Millibars
A millibar is a unit of pressure equal to 1/1000th of a bar, or 100 pascals. Barometric pressure readings are often given in millibars.