No-vig calculator: fair odds and sportsbook margin

Enter the odds for every outcome of a market. For hockey 3-way (regulation time) fill in the draw too.

How it works

Add up the implied probability of every outcome. Anything over 100% is the margin the sportsbook builds into the line.

To get the fair probability of each outcome, divide its implied probability by the total. Fair odds are 1 divided by that fair probability.

Compare margins across sportsbooks on the same game. A book that charges 3% instead of 6% pays you more on every bet you make there over time.

What is a normal sportsbook margin?

On main markets such as an NHL moneyline, sharp books charge around 2 to 4%. Recreational books and props are often 5 to 10% or more.

Is no-vig the same as true odds?

It is the fair price according to that sportsbook. It removes the margin evenly, which is a good estimate but not a guarantee of the real chance.

Why does this matter for parlays?

The margin applies to every leg, so a 5% margin on each of four legs adds up to a much larger edge against you on the parlay.

Vig (vigorish): The bookmaker's commission embedded in the odds, measured as the share of total stakes it keeps on a balanced market.
Implied probability: The probability an odds price represents, calculated as one divided by the decimal odds, before the bookmaker's margin is removed.
Closing line value (CLV): The difference between the odds you took and the final pre-event price, used as the most reliable indicator of long-run edge.
Moneyline: An outright winner bet; in two-way sports like tennis it is the match price, while soccer adds the draw as a third outcome.

Odds converter Convert American, decimal and fractional odds and see the implied probability.
Parlay calculator Add up to 12 legs and see the combined odds and payout of a parlay.
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