Here you can find a set of calculators to give you various statistics. You can leave the final stat blank and it will assume start+1. So You can calculate lvl 100, 50% to lvl 101 by entering 100, 50% and leaving final level blank, saving time.
I have a forum on TibiaCity here. You can use that to report any bugs that you may encounter, or you can just email me (firstname.lastname@example.org).
I believe in giving credit where credit is due, and we owe most of what we know to Dagor Dragontooth and Halfhigh. They dedicated their work to the Red Rose and Followers of the White Dragon.