What box size for a 10''db sub?

I'd love to know the recommended enclosure size for both an 8''db subwoofer and a 10'' db sub (dvc or non). I need to figure out how big the boxes will be for I have a small car (MKV VW Golf)
I can't seem to be smart enough to figure out the math for it. (I'm not great at math to begin with:biggrin:)

The 10's usually need a pretty decent sized box. A .50 ft3 is the smallest you'll want to use on most and a .66 ft3 is usually the best for the Polk subs. If you're really tight on space, the 8 will be the best cause you can get down to .4 ft3 and even a little lower.