Dew Point Calculator
Free dew point calculator using the Magnus formula. Calculate the temperature at which moisture will condense from air based on temperature and humidity.
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Calculate the Dew Point Temperature
Dew point is the temperature at which air becomes saturated with moisture and dew forms. It's a key indicator of how humid the air feels. Our calculator uses the Magnus formula to accurately determine the dew point from temperature and relative humidity.
What Is Dew Point?
Dew point is the temperature to which air must be cooled for water vapor to condense into dew or fog. Unlike relative humidity, dew point provides an absolute measure of moisture in the air. A higher dew point means more moisture and a stickier, more uncomfortable feeling.
Magnus Formula
Td = (c × γ) / (b - γ), where γ = ln(RH/100) + (bT)/(c+T)Why Calculate Dew Point?
Comfort Assessment
Dew point is the best indicator of how humid and uncomfortable the air feels.
Weather Prediction
When temperature approaches dew point, fog, dew, or precipitation may form.
HVAC & Building
Prevent condensation, mold, and moisture damage in buildings.
How to Use This Calculator
Common Applications
Aviation
Pilots use dew point to predict fog and visibility conditions.
Agriculture
Farmers monitor dew point for disease prevention and irrigation planning.
HVAC Systems
Engineers design systems to prevent condensation on surfaces.
Sports & Outdoor Activities
Athletes use dew point to gauge true outdoor comfort levels.
Frequently Asked Questions
A dew point of 55°F (13°C) or below feels comfortable. 55-65°F feels increasingly humid. Above 65°F (18°C) feels very humid, and above 70°F (21°C) is oppressive.