The
Brewsta help states:
Brewsta keeps track of three volumes:
recipe volume
represents the volume into the fermenter, after kettle losses. As at v1.1 this is simply a convenience value, it doesn't enter into any calculations.
post boil volume
volume in the kettle at the end of the boil. OG is calculated at this volume.
pre boil volume
volume in the kettle at the start of the boil. BG is calculated at this volume.
These volumes use defaults that are provided in the configuration file (brewsta.cfg). You can edit these for the specific recipe and/or edit the config file to suit your brewing practices.
In my experience, enter your defauly brew size by modifying the CFG file. The if you wish to make a different size batch, click in the recipe volume, enter the amount then press TAB (not enter!!!) to move to the post boil volume, again enter the size , press TAB & enter the preboil volume & press TAB.
Use TAB to move across a row when entering ingredient info eg weights. Don't gorget to use 0.xx not .xx for amounts of malt less than 1kg. The recalculate mash botton works well when you change your mash volumes.
Stick with brewsta, it doesn't do everything & has a few quirks, but then it doesn't have the bloat of other progs (IMHO)