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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

Dew Point

67.2

How to Use This Calculator
  1. Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
  2. Temperature Unit — Measurement system to use. Choose from: Fahrenheit (°F), Celsius (°C). default: 0.
  3. Air Temperature — Temperature in the selected unit. Accepts values from -40 ° to 130 ° (default: 80 °).
  4. Relative Humidity — Relative humidity as a percentage. Accepts values from 1 % to 100 % (default: 65 %).
  5. Once all inputs are set, review your results in the Results panel. Here's what each output means:
  6. Dew Point — shown as a numeric value. This is the primary result of this calculator.
  7. Comfort Level — your calculated result.
  8. Temp/Dewpoint Spread — shown as a numeric value.
  9. Frost Risk — your calculated result.
  10. View the Temperature vs Dew Point below for a visual breakdown of how the numbers relate to each other.
  11. Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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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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