[Help me!] Odds and Outs

9 outs * 2% is 18% to catch on the turn. 18% for Hero leaves 82% for Villain.
82/18 ~= 4.5:1 against

Same calculation for the river.

If Villain has pushed all-in on the flop
9 outs * 2% * 2 cards = 36%. Hero has 36% so Villain has 64%.
64/36 ~= 1.8:1 against

EDIT: If Villain is not putting you all-in on the flop, the 36% is completely useless. DO NOT bet or call for the odds on 2 draws when you have to face another bet after the first draw. If you're shoving the flop with a FD, then you KNOW you're behind and you're counting on fold equity to make your move +EV.