OK, so either I'm missing something, or this odds generator is off. My understanding of the 4x2 rule is that your equity (after the river) can roughly be calculated by multiplying your outs by 4 after the flop and 2 after the turn.
So, in the hand in the image attached, I calculated my equity as being ~60%
(three 5's, two 7's, ten spades=15 outs; 15*4=60)
This odds calculator has me at 51%
who's off here?
http://imgur.com/a/21lyj