Free odds calculators

free calculators on this site

3

prices they ask you for

11

figures they give back

24

Expected Value Calculator, on the worked example

$12.50

Each calculator takes the prices you are actually looking at and does one piece of arithmetic with them on the page. Give the no-vig calculator both sides of a market and it returns each side's implied probability, the overround between them, the hold that overround represents and the fair price on each side with the margin stripped out. Give the expected value calculator a price and your own probability and it returns the break-even probability, the edge in percentage points and what the stake is worth on average. Give the parlay calculator two to four legs and it multiplies them into one price and shows the probability that price implies. Nothing here forecasts anything, names a market, or tells you what to do with the answer.

Every figure on this site comes out of the prices you type and the arithmetic printed beside them. There is no feed, no price of our own and no third-party data: the site holds no odds at all, only the method for reading the ones you already have. Conversions are exact, not approximations, and the American-to-probability step is written out on each page so you can check it by hand.