hvac calculator
Dew Point Calculator
Calculate the dew point from air temperature and relative humidity using the Magnus approximation.
How it works
Magnus approximation: dew point derived from air temperature and relative humidity.
Worked example
25 C at 50% RH gives a dew point of about 13.9 C (56.9 F).
When to use it
- The Magnus-Tetens form is accurate from 0 to 60 C.
- When a surface is at or below the dew point, moisture condenses on it.