About this tool
Find the dew point from air temperature and relative humidity.
Magnus formula: γ = ln(RH/100) + b·T/(c + T), dew point = c·γ ÷ (b − γ), with b = 17.625 and c = 243.04 °C.
Formula: T_d = cγ/(b − γ)
Example: Air temperature (°C) = 25, Relative humidity = 60 → Dew point (°C) = 16.7.
Accurate to about ±0.4 °C between −40 °C and 50 °C.
Quick steps
- Enter your values — every field shows its unit.
- Press Calculate (or Try an example to see how it works).
- Read the results and copy them if you need them elsewhere.
The calculation runs in your browser. Nothing you type is sent to 1CLIK.
FAQ
How does the Dew Point Calculator work?
Magnus formula: γ = ln(RH/100) + b·T/(c + T), dew point = c·γ ÷ (b − γ), with b = 17.625 and c = 243.04 °C.
What should I keep in mind?
Accurate to about ±0.4 °C between −40 °C and 50 °C.
Is my data sent anywhere?
No. The numbers stay on your device; the page only shows the result.