Update Aug 12: this calculator is now wrong since in patch 3.2 the rating:percentage ratio changed.
I developed this here for out-of-game convenient analysis, using google spreadsheets. If it gets mucked up, just revert version to that of June 6th.
You can enter your dodge, defence, agility, parry, strength to see what your final statistics are after diminished returns.
Has no block rating calculation, sorry my shield-wielding brethren. I simply didn’t put it in.