Dew Point Calculator
Enter air temperature (°C) and relative humidity (%) to estimate the dew point (°C and °F).
Input Data
Results
16.7
62
At a glance:Magnus: γ = ln(RH/100) + (b·T)/(c+T), dew point Td = (c·γ)/(b−γ), with b=17.62, c=243.12. °F = °C×9/5+32.
Formula
γ = ln(humidity/100) + (17.62 × tempC) / (243.12 + tempC).
dewPointC = (243.12 × γ) / (17.62 − γ).
dewPointF = dewPointC × 9/5 + 32.
How to Use
- Enter air temperature (°C) and relative humidity (%).
- Get the dew point in °C and °F instantly.
FAQ
What does the dew point represent?
It is the temperature air must cool to for water vapor to condense; a higher dew point means more humid air.
What if dew point is near the air temperature?
That means relative humidity is high (near saturation) — muggy feel, and fog or condensation is likely.
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References
Content reviewed by the Calculatorism editorial team. Results are for reference only; please refer to the relevant authorities for the official figures.