That's what you win, you get back what you bet as well. I think Europeans (?) use the way that's done on here, because we use the way you're talking about down here as well.
5/3 in real life = 2/3 here on PC
So if you bet $10 in real life you'd get back $16.67, and here you'd get back the $10 you bet as well as $6.67 in winnings.