Air temperature in °C and relative humidity %—approximate dew point (Magnus). Not for aviation critical use.
Air temperature in °C and RH in (0, 100] feed a Magnus‑type rearrangement with constants a = 17.27, b = 237.7. Output shows dew point in °C and °F. Extreme combinations that make the denominator near zero are rejected.
This calculator uses plain decimal numbers. If a result looks wrong, check whether you used a comma instead of a dot (or vice versa) where the field expects one.