Bonus Bet Tool
See the guaranteed profit you can pull from free and bonus bets, and the best lay odds.
How to Use This Calculator
- Pick the bonus type: Stake Not Returned (SNR) or Stake Returned (SR)
- Input the bonus/free bet amount
- Input the back odds from the bookmaker
- Input the lay odds from the betting exchange
- Input the exchange commission rate
- Read the 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's bonus bet conversion?
Bonus bet conversion turns a free or bonus bet into real cash by pairing opposing back and lay bets. The conversion rate shows what share of the bonus value you lock in as guaranteed profit.
What counts as a good conversion rate?
SNR (Stake Not Returned) free bets typically convert at 60-80%. SR (Stake Returned) free bets reach 80-95%. For SNR bets, higher odds usually push the rate up.
Higher odds or lower odds?
On SNR free bets, higher odds (5.0+) lift the conversion rate but demand more lay liability. On SR free bets, odds barely move the rate. Strike a balance between conversion and liability you can cover.
SNR vs SR — what's the difference?
SNR (Stake Not Returned): a winning free bet pays the profit only, not the stake. SR (Stake Returned): you get the full payout, stake included. SR bets are worth more and convert at a higher rate.