Cloud Base Calculator
The cloudbase is the lowest altitude of the visible portion of the cloud. It is traditionally expressed either in m or feet above mean sea level (or planetary surface),
or as the corresponding pressure level in hectopascal (hPa, equivalent to millibar)
Weather calculation is made easier here.
Formula
Cloud Base = ( ( Temperature - Dew point ) / 4.4 ) * 1000 )
Where,
Temperature – the amount of heat or cold measured on a thermometer.
Dew point – the temperature to which air must be cooled for saturation to occur.
This tool will help you dynamically to calculate the Cloud Base online.