Dew Point Calculator

Use this dew point calculator to estimate the temperature at which the air would reach saturation based on the current air temperature and relative humidity. It is useful for weather awareness, indoor comfort checks, condensation risk, greenhouses, storage areas, ventilation planning and light HVAC work.

The calculation uses a standard meteorological approximation that works well for practical humidity estimates. After you enter air temperature and relative humidity, the tool returns the dew point, the temperature spread between the current air and saturation, and a simple comfort reading so the number is easier to interpret.

In general, the closer the air temperature is to the dew point, the easier it becomes for fog, window condensation, damp surfaces and sticky conditions to show up. That makes dew point more informative than relative humidity alone when you want a quick sense of how the air will actually feel.