Lay Betting Calculator
Calculate lay stakes, liability, and profit for Betfair/exchange bets. Includes back-to-lay converter and multi-lay calculator.
Odds format:
Lay Bet Inputs
$
%
Results
Enter lay odds to see your liability and profit.
Understanding Lay Betting
Lay Liability
Liability = LayStake × (LayOdds − 1). This is the amount you risk if the back side wins. Always ensure you have enough in your exchange account to cover your liability.
Lay Profit
Profit = LayStake × (1 − commission%). If your lay wins (the event does NOT happen), you receive the lay stake minus the exchange commission.
Back-to-Lay
Back at high odds early, then lay at shorter odds in-running. Optimal lay stake = (BackStake × BackOdds) / (LayOdds − commission). Locks in guaranteed profit if odds have shortened.
Commission Impact
Betfair charges 2 to 5% commission on winnings. This reduces your effective lay odds. Always calculate effective lay price = LayOdds − (LayOdds − 1) × commission rate.
Exchange lay betting exposes you to the full liability of a bet. Never lay for more than you can afford to lose on that outcome.
Manage Your Lay Exposure
GAMB·8 gives you automated bot strategies, real-time analytics, poker HUD, and sports intelligence: all the tools to track liability and lock in guaranteed profit.