Vig & Hold Calculator

Frequently Asked Questions

What is the vig (or overround)?

The vig is the bookmaker's built-in margin. Sum the implied probabilities of all outcomes; the amount above 100% (the overround) is the edge. A two-way market summing to 105% has a ~4.8% hold.

How is the hold percentage calculated?

Hold = (overround − 1) ÷ overround, expressed as a percent of total stakes the book expects to keep. It is the long-run cost to bettors and the reason the house wins over time.

What are no-vig fair probabilities?

Divide each outcome's implied probability by the total (overround) so they sum to 100%. This estimates a margin-free price for analysis only - it does not remove the real-world house edge you face.

What is a typical hold?

Common point-spread markets hold around 4–5%; longer-odds and prop markets can hold 10–30%+. Lower-hold markets are less unfavorable, but every bet still carries a negative expected value over time.

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Sports & Betting Disclaimer: Informational only. Not betting advice.

This calculator is for informational and educational purposes only and is not betting, gambling, or financial advice. It does not predict outcomes or guarantee returns. Gambling involves risk; never wager more than you can afford to lose. You are responsible for complying with the gambling laws in your jurisdiction.

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How This Calculator Works

This tool is informational and educational only, is not betting advice, and assumes you gamble responsibly. Every betting market is priced so the sum of the implied probabilities of all outcomes exceeds 100%. That excess is the bookmaker's built−in margin, known as the vig (vigorish), juice, or overround. It is the structural reason the house wins over time and the single biggest hurdle a bettor must overcome: it is not a fee charged on losses but a permanent tax baked into every price, paid whether you win or lose the individual bet. On a balanced book the operator collects roughly that margin no matter which side comes in, which is why running a sportsbook is far more like running a casino than like gambling. This calculator converts each side to an implied probability (1 ÷ decimal odds), sums them, reports the overround and the effective hold, and then strips the margin proportionally to reveal the no−vig fair probabilities - the book's honest view of each outcome once its edge is removed, which is the only number worth comparing against your own estimate.

Formula / Method

For each side i, implied probability p_i = 1 ÷ D_i. Total T = Σ p_i. Overround % = (T − 1) × 100. The theoretical hold (margin as a share of total stakes on a perfectly balanced two−way book) = (T − 1) ÷ T × 100. Fair no−vig probability for side i = p_i ÷ T, and the corresponding fair decimal odds = T ÷ p_i = 1 ÷ (p_i ÷ T). The method generalizes to three−way markets (home/draw/away) and any multiway market - just list every outcome.

Worked Example

A two−way market priced −110 / −110. Each decimal = 1.909, each implied probability = 1 ÷ 1.909 ≈ 0.524 (52.4%). Total = 1.048, so the overround = 4.8%. Hold = 0.048 ÷ 1.048 ≈ 4.58% - the book expects to keep roughly 4.6% of money wagered on a balanced book. Removing the vig: fair probability each side = 0.524 ÷ 1.048 = 0.500 (50.0%), fair decimal odds = 1.048 ÷ 0.524 = 2.000. The 4.8 percentage−point inflation on each side is exactly the margin the price hides.

Common Mistakes

Confusing overround (T − 1) with hold ((T − 1)÷T) - the hold is the smaller, true take rate.

Only entering one side; the margin is only visible when every outcome is included.

Forgetting the draw in three−way sports, which understates the total implied probability.

Assuming a low overround means good value - it only means a tighter market, not a beatable one.

Treating no−vig probabilities as guaranteed truth; they are the book's estimate, not certainty.

Tips & FAQ

Why does the vig matter? It is the structural reason most bettors lose long term - you must beat the no−vig fair line, not merely the raw price, just to break even, and clearing the vig consistently is what defines a winning bettor. What is a typical hold? Standard −110/−110 markets hold around 4.5%; alternate lines, props, and especially parlays and exotics hold far more, sometimes 15–30%, which is why they are so heavily marketed. How do sharp bettors use this? They compute the no−vig fair odds at a sharp, low−margin book and compare them across other books to find where a price is genuinely soft - the no−vig number, not the raw line, is the benchmark. Does a tight market mean it is beatable? No - a low hold means efficient pricing, which usually makes an edge harder to find, not easier. Remember that removing the vig in a calculator does not remove the edge against you in reality - lines move, limits constrain winners, and variance is large over any short run. Treat betting as entertainment with a fixed budget, set limits before you start, never chase losses, and seek help if it stops being fun.

Frequently Asked Questions

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