Is there a good calculator for estimating the probability of getting a block from staking x number of coins for y days? I found this
http://crofly.bplaced.net/ but am not sure how to translate the info given in the wallet to the inputs for this calculator.
Yes, that is a TZC PoS calculator that a member was kind enough to draft and share.
Since it's alpha/beta state though--and an unofficial volunteer contribution--it's a semi-finished tool...
For example, some of the field labels might not mean what you think they would.
If you play with the calc a bit though, it's pretty easy to figure out what's going on.
There's also a copy that the SGL project made based on crofly's TZC calculator, you can find it here:
http://www.sigilcalculator.com/Since SGL is pretty much a direct copy/semi-fork of TZC, it might be applicable... but no guarantees.
Oh, and last note, please keep in mind the following: Since the variables involved (e.g., PoS difficulty) can be quite different day to day, since this is not static PoS (i.e., no set APR target) but variable instead, and since there is luck involved... even a perfectly calibrated calculator will only provide a
reasonable guesstimate--in other words, no guarantees.