Calculate lay stake, liability and profit for matched betting.
A lay bet is a bet against an outcome happening, placed on a betting exchange like Betfair. In matched betting, you combine a back bet at a bookmaker with a lay bet on the exchange to cover all outcomes and guarantee a profit (or small qualifying loss).
Qualifying bet: You place a real-money bet to unlock a free bet offer. The goal is to minimise your qualifying loss by finding close back/lay odds.
Free bet: Once you have the free bet, you back at the bookmaker and lay on the exchange. Since the stake isn't your own money, you lock in a guaranteed profit — typically 70-80% of the free bet value.
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Disclaimer: BRT Sports provides data-driven signals for informational purposes only and does not guarantee profits. Sports betting carries inherent risk — you can lose money. All betting decisions and outcomes are your sole responsibility. Please gamble responsibly.