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.
Worked example: the qualifying bet
A 'bet £10, get £30 in free bets' style offer. You back a selection with £10 cash at odds of 3.00 and lay it at 3.10 on an exchange charging 5% commission.
Worked example: the free bet (SNR)
The £30 free bet from the same offer goes on a selection at odds of 4.00, laid at 4.20 with 2% commission. The stake is not returned, so a win pays £90 in profit rather than £120.
SR vs SNR free bets
Most free bets are stake not returned (SNR): the token pays profit only, so a £30 free bet that wins at 4.00 returns £90, not £120. The stake vanishes whatever happens, which is why an SNR token converts to roughly 70-85% of its face value.
Stake returned (SR) free bets pay out like a cash bet: the same £30 winning at 4.00 returns £120. SR tokens are less common and tend to appear as bonus funds or bet refunds. Check the offer terms, since the wording is not always explicit.
The lay sizing differs too. SNR lays against the profit only, while SR uses the same formula as a qualifying bet without the cash at risk. On a £30 token backed at 4.00 and laid at 4.20 with 2% commission, SNR locks in about £21.10 and SR about £28.13. Pick the matching mode in the calculator before placing anything.
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.
Each-way matched betting
An each-way bet is two bets in one: a win part and a place part, with the place part paid at a fraction of the win odds. Place terms vary by bookmaker, market and field size; a race might pay a quarter or a fifth of the win odds across anywhere from two to five or more places.
Matching one means laying both parts separately: the win part against the exchange win market, the place part against the exchange place market. The catch is that exchange place markets do not always mirror the bookmaker's place terms, so the two halves rarely cancel as cleanly as a straight win single.
This calculator sizes win-market lays only. For an each-way offer, run the win part through it as normal, then size the place lay separately against the exchange place market. Extra-place races, where the bookmaker pays more places than the exchange covers, are where each-way matched betting earns its keep: a finish in the extra place wins both your back and lay bets at once.
Common Mistakes to Avoid
The qualifying loss is driven by the gap between the bookmaker back odds and the exchange lay odds. On a thin market that gap can cost more than the free bet is worth. Check it before you place the qualifier, not after.
Commission comes off your exchange winnings, so it changes both the lay stake you need and the profit you keep. Enter your exchange rate before calculating rather than adjusting afterwards.
Stake returned and stake not returned need different lay stakes. Applying the SNR formula to an SR free bet leaves you underlaid, which means you are still exposed to the result.
Bookmakers restrict accounts that only ever bet on promotions. Limits and closures are a normal outcome of matched betting rather than a sign you did something wrong.
Choosing an Exchange for the Lay Side
The lay side needs enough money in the market to match your stake at the odds you want. Betfair carries the deepest liquidity across sports and racing, which usually means the tightest back-lay gap and the least slippage once your stakes grow.
Commission is charged on net winnings, so a lower rate keeps more of the profit. Betfair charges the highest standard rate of the major exchanges, while Smarkets and Matchbook both charge less. The cheapest exchange is not automatically the best one: a thin market with a wide gap can cost more in qualifying loss than you save in commission.
Most matched bettors keep an account at more than one exchange and choose per market. Racing and major football markets are usually deep everywhere, while niche markets often only have real liquidity at Betfair.
When Matched Betting Is Worth the Time
The value is concentrated in signup offers. A new-account free bet converts at a high percentage of its face value because the qualifying loss is small next to the bonus. Once the signup offers in your market are used up, the reload offers that remain are smaller and take more time for each unit of profit.
Every offer costs real time: reading the terms, placing the qualifier, waiting for settlement, then placing the free bet and laying it again. Put a value on those hours before deciding an offer is worth taking.
Matched betting does not scale. Stakes are capped by the offer itself and accounts get restricted over time. It extracts a fixed pool of bookmaker promotions rather than growing with your bankroll, which is why most people who exhaust the offers move on to value betting.
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.
How do you calculate a lay stake?
Divide the back bet's return by the lay odds minus commission. A qualifying bet or a stake-returned free bet returns the stake plus the profit, so the return is the back odds times the stake. A stake-not-returned free bet pays profit only, so the return is the back odds minus one, times the stake. The liability the exchange holds is then the lay stake times the lay odds minus one. Pick the bet type above and the calculator applies the matching formula.
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. Rates vary by exchange and can change with promotions, so check what yours currently charges. 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.