Steriod Calculators

I have a sustanon calculator, but I was wondering if there are any other ones floating around. Preferably in a XL format. If not, does anyone know where I can find in depth info on calculation half-lives and drug durations so I can make my own calculators.
Thanks,
TombstoneAlley

If there are no steriod calculators that is okay. I will make some, but how about good, accurate info on calculating half lives and durations.

okihate to sound dumb BUT ill ask anyway what is meant by half lives and durations.i know i know what a newbie? but i am here toi learn all i can