Betting Vig Calculator
Calculate the bookmaker's margin (vigorish) and find the true odds with zero margin.
2 outcome(s)
1
2
How It Works
💰 What is Vigorish?
Vigorish (vig) or juice is the bookmaker's commission built into the odds. It's the difference between the true probability of outcomes and the odds offered by the bookmaker.
Example: In a fair coin toss, both heads and tails should have 2.00 odds (50% probability each). But a bookmaker might offer 1.91 for both, building in a 5% margin.
🧮 Calculation Formula
Implied Probability = (1 / Odds) × 100
Total Implied Probability = Sum of all implied probabilities
Vigorish = Total Implied Probability - 100
True Odds = 100 / (Implied Prob / Total Implied Prob × 100)
📊 Vig Benchmarks
Excellent< 3% (Sharp bookmakers, exchanges)
Good3-5% (Competitive markets)
Average5-8% (Standard bookmakers)
Poor> 8% (Recreational books, niche markets)
💡 Using This Calculator
- •Compare bookmakers: Check which bookmaker offers the best margins on a market
- •Find value bets: If a bookmaker's odds are higher than the true odds, it may be value
- •Identify arbitrage: Low vig markets make finding arbitrage opportunities easier
- •Understand value: The true odds show what fair odds would be without bookmaker margin