Dew Point Temperature Calculator
Calculate dew point temperature from air temperature and relative humidity
Calculator
Enter the air temperature and relative humidity to calculate the dew point temperature. You can change units if applicable.
About the Dew Point Temperature Calculator
The Dew Point Calculator is a free online tool that computes the dew point temperature from air temperature and relative humidity. The dew point is the temperature at which air becomes saturated with water vapor, causing condensation. Understanding dew point is essential for meteorology, weather forecasting, HVAC design, and thermodynamics.
What You Can Calculate
- Dew Point Temperature (Td): The temperature at which condensation begins for a given air temperature and humidity.
- Humidity Analysis: Evaluate the moisture content in the air and its impact on comfort and environmental conditions.
- Temperature Conversions: Display dew point in Celsius or Kelvin as needed for scientific or engineering applications.
Formula Used
The calculator uses the Magnus-Tetens approximation:
Td = (243.12 × α) / (17.62 − α)
where α = ln(RH/100) + (17.62 × T) / (243.12 + T), with T = air temperature in °C and RH = relative humidity (%).
How to Use the Calculator
- Enter the air temperature and select the unit (°C or K).
- Enter the relative humidity in percent (%).
- The calculator automatically computes the dew point temperature in the selected unit.
- Adjust the inputs to analyze different environmental or HVAC conditions.
Applications of Dew Point Analysis
- Weather Forecasting: Predict fog, cloud formation, and atmospheric moisture levels.
- HVAC & Building Design: Prevent condensation on surfaces and optimize indoor air quality.
- Industrial Processes: Control moisture in drying systems, compressed air, and sensitive equipment.
- Education & Research: Study psychrometrics, thermodynamics, and atmospheric moisture behavior.
- Environmental Monitoring: Assess humidity trends and dew formation for agriculture and environmental planning.