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Free betting calculator

No vig calculator

Enter the prices for every outcome of a market to see the sportsbook's margin and the fair odds without it. Works for 2-way lines and 3-way football markets.

The market

Market
Odds format

Enter the prices from one sportsbook for every outcome of the same market (both sides of a line, or home, draw and away).

Method

Proportional method. Each implied probability is divided by the book total, so every outcome gives up the same share of the margin. The standard method, and the one most sites use.

4.55%vig (bookmaker's hold)
104.76%book total (overround)
Implied and fair probabilities for each outcome
OutcomeImpliedFair (no vig)Fair AmericanFair decimal
Side A52.38%50.00%+1002.00
Side B52.38%50.00%+1002.00

Fair odds are an estimate built from the sportsbook's own prices, not a prediction of the result.

Show the calculation
  1. Implied chances: 52.38% + 52.38% = 104.76% (the book total, or overround)
  2. Vig (hold) = 1 minus 1 ÷ 1.0476 = 4.55%
  3. Fair chance = implied ÷ book total: 52.38% ÷ 104.76% = 50.00%; 52.38% ÷ 104.76% = 50.00%
  4. Fair odds = 1 ÷ fair chance

Calculations show hypothetical outcomes from the prices you enter. They do not predict results, and betting always involves risk.

How the margin is measured

Add up the implied probabilities of every outcome. At -110 / -110 that is 52.38% + 52.38% = 104.76%. The extra 4.76% is the overround; the hold (vig) is 4.55%, the share of wagers the book keeps on balanced action. Divide each implied probability by the total and you get the fair chances, here 50% each, or +100.

Two more examples

  • Moneyline -200 / +170: book 103.70%, vig 3.57%, fair chances 64.3% and 35.7%, fair odds -180 and +180.
  • Football 1X2 at +150 / +230 / +180: book 106.02%, vig 5.68%, fair odds +165 / +250 / +197.

Proportional or power method

The calculator offers two ways to remove the margin. The proportional method (the default) divides each implied chance by the book total, so every outcome loses the same share of the margin. The power method raises every implied chance to the same power, chosen so they add up to 100%; it takes relatively more margin from long shots, where sportsbooks tend to hold more. On -200 / +170 the proportional method gives the favorite 64.3% and the power method 65.1%. On an even market like -110 / -110 both give 50%.

Checking the market

Enter prices from one sportsbook for every outcome of the same market. If the implied chances add up to less than 100%, the prices can't all be from one book (or an outcome is missing), and the calculator says so; that situation is what the arbitrage calculator is for. A margin above 25% is flagged too, since it usually means a price from another market slipped in.

Why it matters

Comparing a price with its fair value tells you how much you pay for the bet. The same game can carry very different margins in different markets, and props and futures usually carry more than the main lines. The no vig price is an estimate built from the sportsbook's own numbers, not a prediction.

Related guides

Common questions

What is the vig?

The vig (vigorish, or juice) is the sportsbook's margin: the reason both sides of a -110 / -110 line imply more than 50% each. If the book took equal action on both sides at those prices, it would keep about 4.55% of everything wagered.

What does no vig odds mean?

The price with the margin taken out, so the probabilities of all outcomes add up to exactly 100%. Many bettors use no vig odds from a sharp market as an estimate of the fair price.

Can I use it for 1X2 football markets?

Yes. Choose 3-way and enter home, draw and away. Every outcome of the market must be priced, or the margin can't be measured.

Which method does it use?

The proportional method: each implied probability is divided by the book total. It is the simplest and most common. Other methods put more of the margin on the long shot, which changes fair prices slightly at long odds.

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