What is Matched Betting?

Matched betting is a technique that extracts profit from bookmaker free bets and promotions with minimal risk. By placing a back bet with a bookmaker and a lay bet against the same selection on a betting exchange (such as Betfair), you neutralise the risk of losing — whatever happens, one bet wins and one loses.

The key insight is that bookmaker free bets have guaranteed value: when you use a free bet to back and lay, you keep a percentage of the free bet value as pure profit regardless of the result.

How to Use the Matched Betting Calculator

For qualifying bets (turning cash into a free bet):

Enter the back odds (bookmaker)
Enter the lay odds (exchange)
Enter the stake
Enter the exchange commission rate (typically 2-5%)
Read the qualifying loss — this is the small cost of unlocking the free bet

For free bets (SNR — Stake Not Returned):

Enter the free bet size
Enter the back odds (bookmaker)
Enter the lay odds (exchange)
Read the profit — typically 70-90% of the free bet value

For SR free bets (Stake Returned): The calculator adjusts automatically. SR free bets are worth slightly more than SNR bets.

The Maths Behind Matched Betting

Qualifying bet example:

Back £10 at odds 3.0 (potential return £30)
Lay £10 at odds 3.1 on exchange (liability = £10 x 2.1 = £21)
If wins: +£20 profit from bookmaker, -£21 loss on exchange = -£1 net
If loses: -£10 from bookmaker, +£10 from exchange = £0 net
Qualifying loss ≈ £1 (varies with odds difference and commission)

Free bet example (SNR, £10 free bet):

Back £10 free bet at odds 5.0 (potential profit £40, stake not returned)
Lay £8.20 at odds 5.0 to cover all outcomes
If wins: +£40 from bookmaker, -£8.20 x 4 = -£32.80 from exchange = +£7.20
If loses: £0 from bookmaker (free bet), +£8.20 from exchange = +£8.20
Average profit: approximately £7.50 regardless of outcome

Tips and Strategies

Find bets with close back/lay odds. The smaller the difference between back and lay odds, the lower your qualifying loss.
Choose liquid markets. Major football leagues, top horse racing meetings, and popular tennis events have tight spreads on exchanges.
Track everything in a spreadsheet. Keeping precise records of all backs, lays, profits, and losses is essential for managing your matched betting bankroll.
Never guess your lay stake. Always use the calculator. Miscalculating the lay stake is the most common matched betting error.

Frequently Asked Questions

Is matched betting legal? Yes, matched betting is legal in the UK. It uses bookmaker promotions as intended, though bookmakers may restrict accounts of consistent winners.

What is SNR vs SR? SNR (Stake Not Returned) means if your free bet wins, your stake is not returned as part of the payout — only the profit. SR (Stake Returned) means the stake is included in the return, making SR free bets worth slightly more.

What is a back bet? A back bet is a normal bet: you bet on something to happen.

What is a lay bet? A lay bet is placed on an exchange: you bet against something happening, acting as the bookmaker.

How much can I make from matched betting? UK bettors regularly make £200-£1,000 per month from signup offers and ongoing promotions. Results vary based on available offers and bankroll size.