Oh yeah...I can totally relate.
When I was in school, before I got my degree, I had my excel spreadsheets all set up, so I knew where I stood with my grade (ok...they were all A's, but I was so anal, I had to make sure the whole time). It would give me a sense of peace to know the lowest grade I could get on the final and still be within the 93% required to get my A...LOL.
I have one set up for the pool too. It tells me the exact amount of chlorine I need to add based on the chlorine demand at the time.
