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Calcimator

Dew Point Calculator

Calculate the dew point temperature from air temperature and relative humidity. Includes comfort level assessment and frost risk.

Inputs

°
%

Results

Dew Point

67.2

Comfort LevelOppressive
Temp/Dewpoint Spread12.8°
Frost RiskNo
How to Use This Calculator
  1. Select your Temperature Unit (Fahrenheit or Celsius).
  2. Enter the Air Temperature.
  3. Set the Relative Humidity (%).
  4. Review the Dew Point temperature, Comfort Level, Temp/Dewpoint Spread, and Frost Risk indication.
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Formula

Uses the Magnus formula: Td = (b × α) / (a - α), where α = (a × T) / (b + T) + ln(RH/100). Constants: a = 17.27, b = 237.7°C.

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