I see a few threads on this but have not seen anything which points to a guide for drill and tap size. I have a few common taps (1/4-20, 3/8-16 and 1/2-13) and bought the smallest recommended drill bits for each one, however these are guides dedicated to use in metal and the threads seem to leave more clearance when used in wood than I would prefer.

Wondering if there are any useful guides for choosing drill bit sizes for tapping wood?