Dew Point Calculator — Magnus Formula Accuracy | PsychroCalcLab

Calculate precise dew point temperatures. Essential for mold prevention, building science, and industrial process control. Understand condensation risk in real-time.

How to Use

  1. Enter the dry-bulb temperature and the relative humidity.
  2. The results update automatically as you change the input values.
  3. Review the calculated value and the engineering notes shown below the result.

Frequently Asked Questions

Why does condensation form on windows?

Condensation forms when the glass temperature drops below the dew point of the indoor air. This happens most often in winter when the air is humid and the glass is cold.

How do I prevent mold using dew point data?

To prevent mold, you must keep indoor surfaces above the dew point or lower the indoor dew point by using a dehumidifier to remove moisture from the air.

Is the dew point the same as 100% humidity?

Yes. When the air temperature equals the dew point, the relative humidity is 100%, and the air is fully saturated with water vapor.