Thanks guys... I hope you can get some use out of it!
I added an Original Batch Size option now as well... makes it even easier to down or upsize batches.
Simply start with your original batch size, add the ingredient amounts and you are good to go.
Not sure how to add in a final gravity temperature into the calc. If someone knows a formula, send 'er over!
I also added an Excel '97 file for you, modobrew.