Hi @Matthew_Camilleri - you can find the number of weekends between a start and end date with formulas:
First, work out the number of days in the period, then work out the number of workdays in the same period, then take them away. Rather than two columns as I have, you can combine this into a single formula field with:
Note that I am adding 1 to the DATETIME_DIFF part of the formula in order to get the number of days inclusive of both the start and end date. By default DATETIME_DIFF gives a non-inclusive number of days, e.g. diff between 1st March and 1st March is zero.