Bonus Bet Helper
See how much guaranteed profit a free or bonus bet is really worth, plus the best lay odds.
How to Use This Calculator
- Pick your bonus type: Stake Not Returned (SNR) or Stake Returned (SR)
- Type in the amount of your bonus or free bet
- Add the back odds offered by the bookmaker
- Add the lay odds from the betting exchange
- Enter the exchange’s commission rate
- Check out the lay stake, your guaranteed profit, and the 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 simply how you turn a free bet or bonus into real cash, by pairing up a back bet and a lay bet on opposite sides. The conversion rate shows you what slice of the bonus value you can lock in as guaranteed profit.
What counts as a good conversion rate?
With SNR (Stake Not Returned) free bets, you’ll usually see conversion rates of 60-80%. With SR (Stake Returned) free bets, rates of 80-95% are within reach. As a rule, higher odds tend to give you better conversion rates on SNR bets.
Should I go for higher or lower odds?
For SNR free bets, higher odds (5.0 and above) boost your conversion rate, but they also mean a bigger lay liability. For SR free bets, the odds don’t really change the conversion rate much. The trick is finding a sweet spot between solid conversion and liability you can comfortably handle.
How do SNR and SR differ?
SNR (Stake Not Returned) means that when the free bet wins, you keep only the profit, not the stake itself. SR (Stake Returned) means you get the whole payout, stake included. SR bets are more valuable and convert at a better rate.