Bonus Bet Sports Calculator
See what a free bet is really worth and the best lay odds.
How to Use This Calculator
- Pick the bonus type: Stake Not Returned (SNR) or Stake Returned (SR)
- Type in the bonus or free bet amount
- Enter the back odds from the bookmaker
- Enter the lay odds from the betting exchange
- Add the exchange commission rate
- See your lay stake, guaranteed profit, and conversion rate
Formula
SNR Lay Stake = Bet Amount × (Back Odds - 1) / (Lay Odds - Commission Rate)
SR Lay Stake = Bet Amount × Back Odds / (Lay Odds - Commission Rate)
Guaranteed Profit = min(Back Profit, Lay Profit)
Conversion Rate = (Guaranteed Profit / Bet Amount) × 100%
Frequently Asked Questions
What does bonus bet conversion mean?
Bonus bet conversion is how you turn a free bet or bonus into real cash by placing matching back and lay bets. The conversion rate shows you what slice of the bonus value you can pull out as guaranteed profit.
What counts as a good conversion rate?
With SNR (Stake Not Returned) free bets, you’ll usually see a conversion rate of 60-80%. With SR (Stake Returned) free bets, you can hit 80-95%. Higher odds tend to give you better conversion on SNR bets.
Should I go for higher or lower odds?
For SNR free bets, higher odds (5.0+) boost your conversion rate but tie up more lay liability. For SR free bets, the odds don’t move the conversion rate much. Aim for a sweet spot between solid conversion and liability you can handle.
How do SNR and SR differ?
SNR (Stake Not Returned) means a winning free bet pays you the profit only, not the stake. SR (Stake Returned) means you get the full payout, stake included. SR bets are worth more and convert at a higher rate.