Convert barometric pressure between common weather units and estimate pressure change with elevation. Enter pressure in hPa, inHg, psi, atm, kPa, or Pa to see matching values and pressure category notes.
Pressure:
Enter the pressure value you want to convert or compare.
Pressure unit:
Select the unit you are starting with, such as hPa, inHg, psi, atm, kPa, Pa, or mmHg.
Elevation:
Optional elevation helps estimate pressure adjusted toward sea level or station pressure depending on the selected mode.
Result:
The calculator converts your pressure into common weather and science units and compares it with a standard pressure reference.
A barometric pressure calculator is useful for weather tracking, home weather stations, aviation references, hiking, altitude comparisons, storm monitoring, pressure unit conversion, and general atmospheric calculations.
Barometric pressure trends are often more useful than one single reading because rising or falling pressure can signal changing weather patterns.
Your result shows the pressure converted into several common units. It also compares the pressure with the standard sea level reference of 1013.25 hPa. Lower pressure is often associated with unsettled weather, while higher pressure is often associated with calmer or clearer conditions.
Barometric pressure is the pressure of the atmosphere at a location. It is commonly measured with a barometer.
A common standard sea level reference is 1013.25 hPa, 29.92 inHg, or 1 atmosphere.
Yes. For weather pressure, 1 hPa equals 1 millibar.
Yes. Barometric pressure generally decreases as elevation increases because there is less air above the location.