CP Price Desk
The math in every price, on the board.
No-vig fair line
Strip the book's margin from a two-way or three-way price and see the fair chance and fair odds. Free, no sign-in, 21+.
Enter both sides
On the boardTurn on JavaScript to calculate.
A calculator shows the math in a price. It does not pick for you.
How it works
Implied chances
Each price becomes 1 divided by its decimal odds. What the sides add to over 100% is the overround.
Remove the margin
Each fair chance is that side’s implied chance divided by the sum; fair odds are 1 divided by the fair chance.
The hold
1 - 1/sum: the book’s share of the money if bets are balanced.
fair chance = implied chance ÷ sum of implied chances- -150 / +130 → implied 60.0% and 43.5% (sum 103.5%)
- Fair 58.0% and 42.0%
- Fair odds -138 / +138 · overround 3.5%, hold 3.4%
The power method finds k with Σ pik = 1 and uses pik; it moves favorites slightly more (on -150 / +130 it gives the favorite 58.4%). The page shows the multiplicative result because it is the one most people compare against. The same price both sides (-110 / -110) gives 50/50 and a 4.5% hold. If the prices add to less than 100%, the page says “These prices add to less than 100%. Check the numbers.” and still computes.
Common questions
What is the vig?
The margin built into both sides of a line so they add to more than 100%.
Which method do you use?
Multiplicative: each implied chance divided by their sum; the power method is explained below.
Is the fair chance the true chance?
No. It is the market's chance with the margin removed. Our cards state our own chance separately.