I use Beersmith and BrunWater. Brunwater gave values for water additions and both programs are amazing. I did a Belgian Pale Ale and used .80 gal mash water and 1.10 gal sparge water. This was a one gallon batch, still in secondary as I type this. Beersmith said I'd be at about 1.036 post mash gravity, I was at 1.039. I can accept that. Post boil volume was to be at about 54 but I was at 67. My post boil volume was just slightly less than one gallon. I used a larger "spaghetti pot", larger than I needed. I had to add water to adjust gravity to expected 54. Could this higher gravity be from a "wider" pot and more evaporation or I "squeezed" the grain too hard before sparging? Everything works out OK otherwise. After boil, I ended up, after a funnel/sieve, with about .80 gallons. My volumes seem weird?? Every batch I brew, extract or otherwise, I end up with less than the "brewed amount."