Matched Betting Calculator

What Is Matched Betting?

Matched betting offsets a back bet at a bookmaker with a lay bet at a betting exchange. When stakes are calculated correctly, the outcome is nearly the same whether the selection wins or loses. Promotional free bets can turn that balanced position into guaranteed profit.

How Lay Stake Is Calculated

For a normal qualifying bet, lay stake equals back stake multiplied by back odds, divided by lay odds. For a free bet where the stake is not returned, lay stake uses only the potential winnings: back stake times (back odds minus 1), divided by lay odds.

Lay liability is the amount you risk on the exchange if the selection wins: lay stake multiplied by (lay odds minus 1). Compare results with the Decimal Odds Calculator and Net Profit Margin Calculator.

Reading the Profit Output

The calculator shows profit for both outcomes and highlights the guaranteed profit, which is the smaller of the two. When back and lay odds are close, the guaranteed value is near zero or slightly negative because of the odds spread and exchange commission not modeled here.