Calculate sea level pressure from station pressure, altitude, and temperature. This helps adjust local pressure readings so they can be compared with standard weather reports.
Common Sea Level Pressure Examples
950 hPa @ 500 m
≈ 1007 hPa
900 hPa @ 1000 m
≈ 1014 hPa
980 hPa @ 250 m
≈ 1009 hPa
Why Sea Level Pressure Matters
Weather Maps
Use sea level pressure
Stations Differ
Altitude changes raw pressure
Comparison
Lets locations be compared fairly
Forecasting
Important for pressure systems
Related Tools
Altitude Pressure
Estimate pressure from elevation
Open Page
Pressure Converter
Convert hPa, inHg, mmHg and PSI
Open Page
About Sea Level Pressure
Station pressure is the actual atmospheric pressure measured at a location. Because pressure drops with altitude, stations located at higher elevations naturally report lower raw pressure values than stations near sea level.
Sea level pressure corrects that raw reading so meteorologists can compare pressure between places fairly. This adjusted value is what usually appears on weather maps, forecasts, and synoptic charts.