Matched betting is a technique that takes advantage of bookmaker promotions to generate guaranteed profits. By covering all outcomes with opposing bets, you eliminate risk.
Qualifying Bets (Normal Mode)
Qualifying bets unlock bonuses or free bets. You accept a small loss (typically 1-5% of stake) to earn a larger free bet. The formula ensures balanced outcomes: LayStake = (BackStake × BackOdds) / (LayOdds - Commission).
Free Bet Conversion (SNR Mode)
Free bets (Stake Not Returned) only pay out winnings. You convert them to cash by laying at the exchange. Higher odds mean better conversion rates - typically 70-80% of free bet value becomes real profit.
Maximizing Profits
Use odds matching tools to find close back/lay prices quickly.
Track all bets in a spreadsheet to monitor ROI and bonus progress.
Be aware of gubbing - vary bet types and don't only bet on obvious matched betting markets.
Common Mistakes
Forgetting to account for exchange commission on lay winnings — most exchanges charge 2-5% commission on net winnings. The calculator factors this in, but make sure you enter your actual commission rate for accurate results.
Using free bets on short odds selections (under 3.00) — this dramatically reduces your conversion rate. At odds of 2.00, your SNR free bet conversion drops to around 48%. Target odds of 4.00-6.00 for optimal conversion rates of 75-85%.
Not checking whether your free bet is stake-returned (SR) or stake-not-returned (SNR) — this completely changes the calculation. An SR free bet is worth more because you get the stake back if you win. Always check the terms and select the correct mode in the calculator.
Worked Examples
Qualifying Bet Example
You need to place a £10 qualifying bet to unlock a free bet offer. You find a match where back odds are 3.00 at the bookmaker and lay odds are 3.10 at the exchange (2% commission). Enter these values in Normal mode. The calculator shows: lay stake £9.71, lay liability £20.39, and a qualifying loss of approximately £0.49. This small loss is the cost of unlocking the free bet — well worth it if the free bet value is £10 or more.
Free Bet Conversion (SNR)
You have a £25 stake-not-returned (SNR) free bet. Find a selection with back odds of 5.00 and lay odds of 5.20 (2% commission). Switch to Free Bet mode and enter these values. The calculator shows: lay stake £23.58, lay liability £99.04, and a guaranteed profit of £21.78. That's an 87% conversion rate — meaning you extract £21.78 from a £25 free bet regardless of the match outcome.
Free Bet on an Accumulator
You have a £10 free bet and want to maximise returns with a 3-fold accumulator. Place the free bet on three selections at combined back odds of 12.00. Then lay each leg individually at the exchange. The combined conversion rate can exceed 95% on accumulators due to the higher odds, potentially extracting £9.50+ from a £10 free bet — though this requires more exchange liquidity and careful timing of the lay bets.
Yes, matched betting is completely legal. You are simply using bookmaker promotions as intended and hedging your bets at exchanges. However, bookmakers may limit or close accounts of suspected matched bettors.
SNR (Stake Not Returned) free bets only return winnings, not the original stake. SR (Stake Returned) free bets return both stake and winnings. This calculator uses SNR mode which is most common.
Profits vary based on available offers. New bettors can typically make £500-1000 from signup offers alone. Ongoing promotions can generate £100-500 per month with regular effort.
