Calculate Sugar to Add to Wine Must
This tool takes a current specific gravity (SG), the desired ABV or initial gravity (IG), and returns how much sugar to add to your wine must based on your vessel size and % full (if adding water to concentrate). This newest version also will take into account any sugar locked in fruit that you might add.
You can view or print the manual formula here.
Metric
If Adding Concentrate Only
If adding water to concentrated juice, enter the % level you were
filled to when you took the SG, to compensate for the water yet
to be added to get to the target must level. Otherwise, leave at 100.
If Adding Fruit Only
If you are adding fruit to the must, select the fruit and weight to
calculate and subtract an approximate amount of sugar locked in
it (we will have you add this much less). This assumes that all of
the sugar in the fruit will be converted to alcohol.
Sugar to add: