Same here I do not know after fermentation I fill it up to the base of the neck tried to use the calculator above but it does not seem to work
If you look at the start of this thread everyone was using 800g plus approximately 250g for the juice (2 litres) so we called it 1100g for 13%, the only way to know for sure is to take a hydrometer reading when you start and finish (even then its not 100% accurate as you never fill the DJ when you start and top up later).
You have a wine somewhere between 13% and 15%, to be honest i now only use a total of 900g as it the original put SWMBO to sleep after a couple of glasses.