Determining distance at which vignetting will occur?

Is there a way to determine how far past the lens opening (ie. filter threads) where you will start to see noticable vignetting in your images if you have a hood (full, not petal style) or stacked filters? I'm trying to figure this out for a 60mm micro, and an after-market lens hood that I may/or may not have to trim down for a little project I'm thinking of persuing.

Thanks,
Paul