Bonus Bet Betting Calculator
Free or bonus bet value and the optimal lay price.
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 bookmaker back odds
- Input the exchange lay odds
- Input the exchange commission rate
- Read the lay stake, locked-in 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
Define bonus bet conversion.
Bonus bet conversion turns a free or bonus bet into cash by pairing opposing back and lay bets. The conversion rate states the percentage of the bonus value extractable 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, higher odds generally raise the conversion rate.
Higher odds or lower odds?
On SNR free bets, higher odds (5.0+) lift the conversion rate but demand larger lay liability. On SR free bets, odds have little effect on the rate. Balance strong conversion against manageable liability.
SNR versus SR — the difference?
SNR (Stake Not Returned): a winning free bet pays the profit only, not the stake. SR (Stake Returned): you receive the full payout including the stake. SR is worth more and converts at a higher rate.