Dew Point Calculator
Calculate dew point temperature from air temperature and relative humidity using the Magnus-Tetens formula.
Atmospheric Conditions
Td = b × α / (a - α), where α = (a × T)/(b + T) + ln(RH/100)
Magnus constants: a = 17.27, b = 237.7°C (for T ≥ 0°C).
Dew Point
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Dew Point Spread
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Frost Point
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Comfort Level
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Additional Values
How this was calculated
Magnus-Tetens: a=17.27, b=237.7°C (above 0°C). Frost point uses a=21.875, b=265.5°C over ice. Comfort: <10°C dry, 10-16 comfortable, 16-18 slightly humid, 18-21 humid, >21 oppressive.
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Book a free strategy call →Understanding Dew Point Temperature
The dew point is the temperature at which air becomes saturated and condensation begins -- critical for gas dehydration, hydrate prediction, and pipeline corrosion control. The Magnus-Tetens formula provides accuracy within 0.4°C for -45°C to 60°C. All calculations run in your browser. Built by Groundwork Analytics.