Matched Betting Calculator
Matched betting turns bookmaker free bets and signup offers into guaranteed cash by pairing a back bet at the bookmaker with an opposing lay bet at a betting exchange. The two positions cancel out, so your only cost is the small qualifying-bet loss. The bonus comes out as profit.
How matched betting works
Place a real-cash back bet at the bookmaker (e.g. £10 at 3.00). Simultaneously lay it at the exchange to lock the outcome. You lose a small amount (~£0.30-1.50) but unlock the free bet.
Use the free bet at the bookmaker on high-odds selections (e.g. 4.00+). Lay it at the exchange. The free bet only pays profit, so the lay extracts ~75-85% of the bonus as guaranteed cash.
UK and Irish bookmakers run dozens of offers per week: reload bonuses, accumulator refunds, price boosts, casino offers. Each one runs through the same back-and-lay loop.
Why matched betting is risk-free
The back bet wins if the outcome occurs; the lay bet wins if it does not. By sizing the lay correctly the two outcomes pay the same. The only variable is whether the free bet itself is awarded, which is determined by the qualifying bet, and that costs almost nothing.
Frequently Asked Questions
What is matched betting?
A technique that uses bookmaker free bet and bonus offers paired with opposing lay bets at a betting exchange to extract guaranteed profit. The back and lay positions cancel out, so the bookmaker offer becomes risk-free cash.
Is matched betting legal in the UK?
Yes. Matched betting is legal in the UK and Ireland. Bookmaker terms may prohibit it for promo abuse and lead to account restrictions, but the activity itself is not illegal.
How much can I make from matched betting?
Typical UK matched bettors extract £500-£2,000 from signup offers in the first month, then £200-£500 monthly from reload offers. Returns scale with the time spent and the bankroll available.
How does exchange commission affect the math?
Commission is charged on the net winnings at the exchange when the lay bet wins. The default is 5% for Betfair and 2% for Smarkets. Higher commission means a slightly larger lay stake to compensate.
Free bet vs qualifying bet: what is the difference?
A qualifying bet is a real-cash bet placed to unlock a free bet (you usually lose a small amount). A free bet is the bonus token, where the stake is not returned, so only the profit converts to cash. The calculator handles both.
What are the risks?
Bookmaker account restrictions (gubbing) are the main risk. Use varied stake sizes, mix in occasional 'mug' bets to look like a normal punter, and spread your activity across multiple bookmakers to extend your useful lifespan with each book.
Pro Tip: Combine matched betting with value betting
Once you have exhausted matched-betting offers at a bookmaker, switch to value betting to keep extracting positive expected value on the same accounts. Bet Hero's value bet scanner finds soft-book mispricings across 400+ sportsbooks.