Odds converter
American, decimal, fractional and implied probability — instantly.
American
-110
Decimal
1.91
Fractional
10/11
Implied win %
52.38%
Choose the format you’re entering, then read the rest. Implied win % includes the book’s margin (the vig).
American, decimal, fractional — what’s the difference?
American odds use + and − (e.g. +150 means $150 profit on a $100 bet; −110 means you risk $110 to win $100). Decimal odds (common in Canada and Europe) show your total return per $1 staked (1.91). Fractional odds (UK) show profit relative to stake (10/11).
The implied probability is the win rate the odds bake in — including the book’s margin (the “vig”). Comparing that implied probability to your own estimate is the heart of finding value. Bankroll Guardian de-vigs and tracks this automatically for every bet you log.
Track every bet automatically
Stop doing the math by hand. Bankroll Guardian logs your bets and shows P&L, ROI, CLV and more — free to start, no card required.