I have a 1/4 thick 30 inch wide by 36 inch tall mirror I am making a frame for. I will be using some 1/4 inch bits I bought off amazon. (I think I posted a link in another posting).

I believe the stiles are the length of the mirror. But the rails are confusing. I assume the finished width including the frame will be the mirror width plus the width of both stiles (2.5 inches)minus the depth of the channel the mirror goes into. 2 times 7/16. I think this equals 34 1/4.

So stile should be 34 1/4 minus 2 times 2 1/2 plus 2 times the tennon length? (I believe the tennon legth is 7/16.) Which equals 30.125?

(I have probable screwed somethign up...