Weather Calculator
Calculate important meteorological values such as dew point, wind chill, and heat index.
Calculated Values
Dew Point
0 °C
Temperature at which condensation begins
Wind Chill Index
0 °C
Perceived temperature due to wind
Heat Index
0 °C
Perceived temperature at high humidity
Saturation Vapor Pressure
0 hPa
Maximum water vapor pressure at a given temperature
Actual Vapor Pressure
0 hPa
Actual water vapor pressure in the air
Explanation of the Calculations
Dew Point
The dew point is the temperature at which air becomes saturated with water vapor. When the temperature drops below the dew point, water vapor condenses into dew, fog, or clouds. The calculation uses the Magnus formula.
Wind Chill Index
The wind chill index describes how cold the temperature feels due to wind. Wind increases the rate of heat loss from the skin. Only applies at temperatures up to 10 °C and wind speeds above 4.8 km/h.
Heat Index
The heat index indicates how hot the temperature feels at high humidity. High humidity hampers sweat evaporation, making the body's cooling less effective.
Vapor Pressure
Vapor pressure is the partial pressure of water vapor in the air. Saturation vapor pressure is the maximum vapor pressure at a given temperature. The ratio between actual and saturation vapor pressure gives the relative humidity.
Want to understand the formulas behind the weather?
At MeteoAcademy, we explain dew point, vapor pressure, and more—with interactive 3D visualizations.