What this tool is: type in ANY box — American, decimal, fractional, or implied probability — and the other three convert live. Plus the number that matters most: the break-even win rate every price secretly demands.
-110 demands 52.4%. That's the standard price's break-even rate — win less often than that and the vig eats you regardless of how sharp the picks feel. Every conversion here is just that truth in four costumes.
Know the fair probability instead of the book's? Get it from the devig calculator, size the bet with Kelly, and let the Positive EV finder do the whole hunt automatically. The shelf lives in the Money Room.
Convert any price between American, decimal and fractional odds and see the implied probability. -150 is 1.67 in decimal, 2/3 as a fraction and a 60% implied chance; +200 is 3.00, 2/1 and 33.3%.
What does implied probability mean?
The win chance the odds price in, before you account for the vig built into them.