Free toolsimplied-probability
American odds, decimal odds, and implied probability are three notations for the same number. −110 means risking $110 to win $100 — which is exactly a 52.38% break-even rate, which is exactly 1.909 in decimal. Edit any format below and read the other two. Pure conversion — no vig removed, no opinion added.
Negative = favorite (risk that much to win $100); positive = underdog (win that much on $100).
Total return per $1 staked, stake included. Must be greater than 1.
The break-even win rate the price implies — vig included when it comes from a book's odds.
American
-110
Decimal
1.909
Implied probability
52.38%
A single price's implied probability includes the book's margin. To see what the market "really" thinks, de-vig BOTH sides with the no-vig calculator.
American odds to implied probability (the notation splits on sign):
Decimal odds are the total return per $1 staked, so the probability is simply the reciprocal:
One caveat worth internalizing: the implied probability of a single book price includes the book's margin, so both sides of a game sum to more than 100%. To see the market's fair probabilities, de-vig the pair with the no-vig calculator.
More free tools
These calculators run the exact helpers the Blitzen terminal uses on every board. See them applied to real markets — and how we grade everything against the close.