Lay to Back Odds Converter
Convert lay odds to back odds and vice versa. Useful for comparing bookmaker and exchange odds.
💰 Reduce Your Exchange Commission
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How It Works
🔄 Lay vs Back Odds
On betting exchanges, you can "back" (bet for) or "lay" (bet against) an outcome. Lay odds are slightly different from back odds due to exchange commission, which is only charged on winning bets.
Example: If a bookmaker offers 2.50 back odds, the equivalent lay odds on an exchange (with 5% commission) would be approximately 2.63. This accounts for the commission you'd pay if the lay bet wins.
🧮 Calculation Formula
Lay to Back Conversion:
Lay Probability = 1 / Lay Odds
Adjusted Probability = Lay Prob × (1 - Commission/100)
Back Odds = 1 / Adjusted Probability
Back to Lay Conversion:
Back Probability = 1 / Back Odds
Adjusted Probability = Back Prob / (1 - Commission/100)
Lay Odds = 1 / Adjusted Probability
💡 When to Use This
- •Comparing odds: See if bookmaker back odds are better than exchange lay odds
- •Finding arbitrage: Identify opportunities between bookmakers and exchanges
- •Matched betting: Calculate equivalent odds for qualifying bets
- •Value betting: Determine if exchange odds represent good value
📊 Commission Impact
Exchange commission significantly affects the equivalent odds. Here's how different commission rates impact a lay bet at 2.50:
0% Commission (Matchbook promo)2.50 back odds
2% Commission (Smarkets)2.55 back odds
5% Commission (Betfair)2.63 back odds
⚠️ Important Notes
- •This conversion assumes standard exchange commission on winning bets only
- •Some exchanges have different commission structures (e.g., premium charges)
- •Always check current odds before placing bets - markets move quickly
- •Consider liquidity - sufficient stake must be available at the displayed odds