Selection A Decimal Odds Enter the decimal odds for the first selection (e.g., 1.90)

Selection B Decimal Odds Enter the decimal odds for the second selection (e.g., 1.90)

Quick Examples:

Standard Two-Way Market Asymmetric Pricing

Calculate Clear

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What Is No-Vig Odds

No-vig odds are the true odds of an outcome after removing the bookmaker's built-in profit margin. When a bookmaker sets odds, they add extra percentage points to guarantee a profit no matter what happens. This extra margin is called the overround or vigorish (vig). The no-vig calculation removes this margin to show what the odds would be in a fair market where both sides have equal value.

How No-Vig Odds Is Calculated

Formula

The calculator starts by converting each decimal odd into a probability. For example, odds of 2.00 mean a 50% chance. Next, it adds all probabilities together to find the total. If the total is more than 100%, the extra amount is the bookmaker's margin. Finally, it divides each probability by the total to remove the margin, then converts back to decimal odds. This gives you the fair price without the built-in house edge.

Why No-Vig Odds Matters

Knowing the no-vig odds helps bettors understand the true probability of each outcome. This information may help you spot value bets and compare odds across different bookmakers more effectively.

Why Removing the Margin Is Important for Value Betting

When you bet without knowing the true odds, you may overpay for bets without realizing it. The bookmaker's margin is hidden in the odds, making every bet slightly worse than fair. By removing this margin, you can see what the real price should be. This helps you identify when a bookmaker offers better odds than the fair market price, which may indicate a value opportunity.

For Comparing Bookmakers

Different bookmakers charge different margins on the same events. One might offer odds of 1.90 on both sides while another offers 1.95. By calculating the no-vig odds, you can see which bookmaker takes a smaller margin. Lower margins generally mean better long-term value for bettors, so comparing margins may help you choose where to place your bets.

For Exchange Betting

Betting exchanges work differently from traditional bookmakers. Users bet against each other, and the exchange charges a commission on winnings instead of building a margin into the odds. Understanding no-vig odds may help you compare exchange prices to bookmaker prices and find the best available option for your bet.

Example Calculation

Consider a tennis match where a bookmaker offers odds of 1.90 for Player A to win and 1.90 for Player B to win. This is a typical two-way market with equal chances according to the bookmaker. You want to find out the true fair odds after removing the bookmaker's margin.

First, the calculator converts each odd to probability: 1 divided by 1.90 equals 0.5263 or 52.63% for each player. Adding these together gives 105.26%, which is the total implied probability. The bookmaker margin is 105.26% minus 100% equals 5.26%. To get fair odds, each probability (52.63%) is divided by the total (105.26%), giving 50% for each player. Converting back to odds: 1 divided by 0.50 equals 2.00.

The calculator displays: Bookmaker Margin is 5.26%. Fair Odds for both Selection A and Selection B are 2.000. Fair Probability for each selection is 50.00%.

This result shows that the bookmaker's true assessment gives each player a 50% chance. The odds of 1.90 include a 5.26% margin in the bookmaker's favor. If you believe a player has a higher than 50% chance of winning, the bet may have value. However, betting always involves risk, and past results do not guarantee future outcomes.

Frequently Asked Questions

Who is this No-Vig Calculator for?

This calculator is for sports bettors who want to understand the true odds behind bookmaker prices. It may be useful for value bettors, odds comparers, and anyone who wants to see how much margin a bookmaker charges on two-outcome markets like tennis, basketball, or football point spreads.

What is vigorish (vig) in sports betting?

Vigorish, also called vig or juice, is the fee a bookmaker charges for taking a bet. It is built into the odds so that the total implied probability of all outcomes adds up to more than 100%. For example, if both sides of a bet have odds of 1.90, the total probability is 105.26%. The extra 5.26% is the vig.

Can I use this calculator for three-way markets?

This calculator is designed for two-outcome markets only. Three-way markets, such as win-draw-win in soccer, have three possible results and require a different calculation. The same principle applies, but you would need to enter three odds instead of two for an accurate no-vig calculation.

How do I know if a bet has value?

A bet may have value if your estimated probability is higher than the bookmaker's implied probability after removing the vig. For example, if the no-vig odds suggest a 50% chance but you believe the true chance is 55%, there may be value in betting on that outcome. However, estimating true probabilities is difficult and uncertain.

Is this calculator accurate for all bookmakers?

This calculator uses a standard normalization method to remove the overround. It assumes the bookmaker applies margin equally across all outcomes. Some bookmakers may weight their margins differently, so results may vary slightly from the true fair odds. This calculator provides an estimate rather than an exact figure.