Surpisingly, it does make a big difference. All of your foot dimensions will be useful for getting the right size boot but only the length of you foot will help with board sizing. For that reason we suggest that you use foot size not boot size when searching for a deck.
Please measure your foot using this method:
Kick your heel (barefoot please, no socks) back against a wall. Mark the floor exactly at the tip of your toe (the one that sticks out furthest - which toe this is will vary by rider). Measure from the mark on the floor to the wall. That is your foot length and is the only measurement that you will want to use. Measure in centimeters if possible, but if not, take inches and multiply by 2.54 (example: an 11.25 inch foot x 2.54 = 28.57 centimeters).
My feet are according to that method 25 cm long!
Nice hijack of my thread Edge