Weather Calculators & Tools
Heat Index, Wind Chill, Dew Point, Temperature converters.
Weather is not just the temperature on the thermometer; humidity and wind change how conditions actually feel and behave. These calculators work out heat index, wind chill, dew point, and related values from basic readings.
Air Density Calculator
Calculate air density from temperature and pressure using the ideal gas law. Fast, accurate, and free, with formula and example.
Standard Atmosphere Calculator
Calculate temperature and pressure at altitude in the troposphere (ISA model).
Barometric Pressure at Altitude
Calculate atmospheric pressure at different altitudes.
Celsius to Fahrenheit Calculator
Convert temperature from Celsius to Fahrenheit.
Dew Point Calculator: Humidity & Temperature
Calculate dew point temperature from air temperature and relative humidity. Supports Celsius and Fahrenheit with step-by-step conversions.
Equivalent Potential Temperature Calculator
Estimate equivalent potential temperature (θₑ) from temperature, pressure and mixing ratio.
Fahrenheit to Celsius Calculator
Convert temperature from Fahrenheit to Celsius.
Frost Risk Calculator
Assess frost risk from weather conditions.
Heat Index Calculator
Calculate the apparent temperature (feels like) from temperature and humidity.
Hypothermia Risk Calculator
Assess hypothermia risk from environmental conditions.
Lightning Distance Calculator
Estimate how far away lightning struck from the flash-to-thunder delay.
Mixing Ratio Calculator
Calculate the water-vapor mixing ratio from vapor pressure and air pressure.
Moon Phase Calculator
Determine the current moon phase.
Pressure Altitude Calculator
Calculate pressure altitude from station pressure (aviation barometric formula).
Psychrometric Calculator
Find relative humidity and dew point from dry-bulb and wet-bulb temperatures.
Rainfall Volume Calculator
Calculate water volume from rainfall depth and area.
Sunrise & Sunset Calculator
Estimate sunrise and sunset times for a location.
UV Index Risk Calculator
Determine sun safety based on UV index.
Saturation Vapor Pressure Calculator
Calculate saturation vapor pressure of water from temperature (Tetens formula).
Virtual Temperature Calculator
Calculate virtual temperature from temperature and mixing ratio.
Wet-Bulb Temperature Calculator
Estimate wet-bulb temperature from air temperature and relative humidity (Stull formula).
Wind Chill Calculator
Calculate the wind chill temperature.
Wind Speed Converter
Convert wind speed between different units.
How to choose the right Weather tool
- Hot and humid? The heat index tool shows how warm it really feels.
- Cold and windy? Use the wind chill calculator.
- Curious about humidity and condensation? The dew point tool explains it.
- Enter readings in the units the tool asks for to keep results accurate.
Who these tools are for
For students, outdoor planners, and weather enthusiasts who want the numbers behind a forecast.
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