Relative Humidity Calculator

Estimate relative humidity and vapor-pressure values from temperature and dew point directly in your browser.

Air temperature

Dew point

Unit

—Relative humidity

—Actual vapor pressure

—Saturation vapor pressure

—Temperature − dew point

Weather calculations run locally in your browser. These tools transform observations with stated formulas; they do not replace official forecasts, alerts, measurements, or professional field instruments.

How to use this Relative Humidity Calculator

Calculate relative humidity from air temperature and dew point. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.