Air Pressure Calculator
Estimate sea-level pressure from station pressure, elevation, and temperature
Measured pressure at the observation location before elevation adjustment.
Height of the station above or below sea level.
Used to estimate the elevation correction.
Calculation Steps
How Air Pressure Is Adjusted
Pressure readings depend on elevation, temperature, and the unit system used.
Station pressure
Station pressure is the direct pressure reading at the instrument location. It falls as elevation increases.
Sea-level adjustment
Sea-level pressure estimates what the station pressure would be if the observation were reduced to sea level.
Pressure units
Weather reports commonly use hPa or millibars, while US barometers often use inches of mercury.
Air Pressure Examples
Convert common pressure readings and compare station and sea-level pressure.
29.92 inHg is about 1013 hPa at standard sea-level pressure.
835 hPa at 1,600 m and 20°C adjusts to about 1,003 hPa at sea level.
The result also shows kPa, psi, mmHg, and atm for cross-reference.
Air Pressure Calculator FAQ
Answers about station pressure, sea-level adjustment, elevation, pressure altitude, and units.
What is sea-level pressure?
Sea-level pressure adjusts a station pressure reading to what it would be at sea level. This makes readings from different elevations easier to compare.
What is station pressure?
Station pressure is the pressure measured at the observation location before elevation adjustment.
Why does elevation matter?
Air pressure generally drops with height. A mountain station can measure much lower pressure than a coastal station even under similar weather patterns.
What is pressure altitude?
Pressure altitude estimates altitude in the standard atmosphere from the entered station pressure. It is common in aviation context.
Is this a forecast?
No. The calculator converts and adjusts readings you enter. Weather forecasting also depends on pressure tendency, wind, fronts, humidity, and local observations.