Dew Point Calculator
Dew point and frost point from air temperature and relative humidity (Magnus formula).
How to use the Dew Point Calculator
- Enter or select: Air temperature, Relative humidity.
- The results (Dew point, Absolute humidity, Vapour pressure, Comfort) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- γ = ln(RH/100) + aT/(b + T)
- T_d = bγ/(a − γ), a = 17.625, b = 243.04 °C