I know i've seen threads on this before, so sorry...I'm going to start do all-grain batches soon. How would I change a recipe from extract to all grain?
The best thing to do is spend the $20 and get Beersmith (does it for you). It makes everything about brewing easier.
There is a "convert" button on the tool bar. Open the recipe and hit convert and a pop up will ask you some questions about equipment and what base grain you want to use.