Bonus Bet Calc
What a free bet is really worth, plus the best lay odds.
How to Use This Calculator
- Pick the bonus type — Stake Not Returned (SNR) or Stake Returned (SR)
- Punch in the bonus/free bet amount
- Enter the back odds from the bookmaker
- Enter the lay odds from the betting exchange
- Add the exchange commission rate
- See 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
What is bonus bet conversion?
Bonus bet conversion is the art of flipping a free bet or bonus into cold hard cash by pairing opposing back and lay bets. The conversion rate spells out exactly what slice of the bonus you can lock in as guaranteed profit.
What counts as a good conversion rate?
With SNR (Stake Not Returned) free bets, expect a typical conversion rate of 60-80%. SR (Stake Returned) free bets push that range up to 80-95%. As a rule, higher odds squeeze better conversion out of SNR bets.
Higher odds or lower odds?
For SNR free bets, higher odds (5.0+) lift your conversion rate but demand a bigger lay liability. For SR free bets, odds barely move the conversion rate. The play is striking a balance between strong conversion and liability you can stomach.
SNR vs SR — what's the difference?
SNR (Stake Not Returned) means a winning free bet hands you the profit only, never the stake. SR (Stake Returned) means you pocket the full payout, stake included. SR bets carry more value and convert at a higher rate.