Estimate atmospheric air pressure from elevation, temperature, and humidity. This calculator converts air pressure into PSI, kPa, pascals, bar, atmospheres, mmHg, inHg, and millibars.
Elevation:
Enter height above or below sea level. Higher elevations usually have lower air pressure.
Temperature:
Air temperature is used to estimate air density and pressure conditions.
Sea level pressure:
Use 1013.25 hPa for standard atmosphere, or enter a local sea-level pressure value when available.
An air pressure calculator is useful for weather, altitude estimates, hiking, aviation examples, science lessons, pressure conversions, HVAC examples, and understanding how elevation changes atmospheric pressure.
This calculator estimates atmospheric pressure. Real local pressure changes with weather systems and measurement conditions.
A common atmosphere approximation is:
P = P₀ × (1 - Lh / T₀)5.255
Standard sea level air pressure is about 1013.25 hPa, 101.325 kPa, 14.696 PSI, or 1 atmosphere.
Yes. Air pressure decreases as elevation increases because there is less air above you pressing downward.
Station pressure is the actual atmospheric pressure at a specific elevation, before adjusting it to sea level.
They are closely related. Barometric pressure usually refers to atmospheric air pressure measured by a barometer.