Matched Betting Calculator
Free, instant calculations for qualifying bets and free bets. No sign-up required.
How It Works
What is a lay stake?
A lay bet is a bet against an outcome on a betting exchange like Betfair. Your lay stake is how much you're willing to risk. Our calculator finds the optimal lay stake to minimise your loss on qualifying bets.
What is exchange commission?
Exchanges charge a commission (usually 2% on Betfair) on winning bets. New Betfair customers often get 0% commission for the first 60 days. Enter 0 if you have a commission-free period.
What's the difference between SNR and SR free bets?
SNR (Stake Not Returned) means if your free bet wins, you only receive the profit — not the stake. SR (Stake Returned) means you receive both the winnings and the original stake. SNR is more common.
What is a qualifying loss?
When placing a qualifying bet to unlock a free bet, you'll typically lose a small amount regardless of outcome. This "qualifying loss" is the cost of unlocking the free bet — usually much less than the free bet value.
Can I share my calculation?
Yes — after clicking Calculate, click "Share calculation" to copy a link that pre-fills all your values. Great for bookmarking or sharing with others.
What is the profit log?
Click "Save to profit log" after calculating to store a result locally in your browser. Your log appears below the calculator so you can track your matched betting progress over time.
New to Matched Betting?
Start with a qualifying bet on a low-odds market to unlock your first free bet. The qualifying loss is usually £1–3. Your free bet is worth several times that.
Browse current free bet offers →This calculator is for guidance only. Always verify odds before placing bets. Matched betting involves risk — bookmakers may restrict accounts. 18+ only.