What is implied probability in MMA odds?
Implied probability is the chance of winning that a price represents: 1 divided by the decimal odds.
How it works
From decimal odds: 1 ÷ odds. From American odds: for a favourite at −X, X ÷ (X + 100); for an underdog at +X, 100 ÷ (X + 100).
The two fighters' implied probabilities add up to more than 100%. The extra is the bookmaker's margin, also called the vig or overround. Dividing each fighter's implied probability by the total removes it and gives the fair (no-vig) probability, which adds up to exactly 100%.
Worked example
Fighter A is −150 and fighter B is +130. A's implied probability is 150 ÷ 250 = 60.0%; B's is 100 ÷ 230 = 43.5%. Together they make 103.5%, a 3.5-point margin. The fair probabilities are 60.0 ÷ 103.5 = 58.0% and 43.5 ÷ 103.5 = 42.0%.
Odds on UFCalendar are information only, not betting advice.
Where to see it on UFCalendar
Get it from the API
The same data is served as JSON by the MMA Fight Data API. The endpoints that carry it:
GET /v1/fights/{id}/oddsOne bout's consensus moneyline: American and decimal prices, implied and de-vigged probabilities, the opening and closing line and the movement between them.
GET /v1/events/{idOrSlug}/oddsThe consensus line for every bout on a card in one call, in card order, unpriced bouts included.