Dew Point Calculator
Solve for any variable in the dew point equation. This tool is essential for understanding weather comfort, HVAC planning, and industrial processes.
What is the Dew Point?
The dew point is the temperature at which air must be cooled for water vapor to condense into liquid water (dew). It is a measure of the absolute amount of moisture in the air. The higher the dew point, the more moisture there is.
What is the difference between Relative Humidity and Dew Point?
Relative humidity (RH) is a percentage that shows how close the air is to being saturated at its current temperature. Dew point is a temperature value that indicates the actual moisture content. RH changes with air temperature even if the moisture stays constant, while dew point remains stable unless moisture is added or removed.
How does dew point affect human comfort?
Generally, dew points below 55°F (13°C) feel comfortable. 55-65°F (13-18°C) starts to feel "sticky." Above 65°F (18°C) feels humid or oppressive, as the body has a harder time cooling itself through sweat evaporation.
When is the dew point equal to the air temperature?
The dew point is equal to the air temperature when the relative humidity is 100%. At this point, the air is completely saturated with moisture, and dew, fog, or clouds will likely form.