If explanation is required go to the ILLUSTRATED VERSION

After entering the W : C ratio, click on the CALCULATE button

When the agitator and the lines are empty, such as at the start of grouting, quantities for making a starting mix can be chosen from the following. Depending on the size of the batch required use an appropriate number of bags of cement together with the quantity of water shown below it. The total volume of the batch should then be the mix quantity shown.

Amount of CEMENT in batch, measured in BAGS =

                1            2            3            4            5 bags

WATER =    Cu Ft    Cu Ft    Cu Ft    Cu Ft    Cu Ft

Mix Volume Cu Ft    Cu Ft    Cu Ft    Cu Ft   Cu Ft
.........after cement added

(Note that these quantities are self-evident, but are provided here for newcomers who might be unsure)