Free Bet Calculator
Convert bookmaker free bets into clear returns. Choose between SNR (Stake Not Returned) and SR (Stake Returned) modes, enter your back and lay odds, and see the exact lay stake, liability, and returns — plus your conversion rate percentage.
How Free Bet Conversion Works
When a bookmaker gives you a free bet, you don't risk your own money — but the maths changes. With SNR (Stake Not Returned), a winning free bet only returns the profit, not the stake. With SR (Stake Returned), you receive the full return as if it were a normal bet.
SNR vs SR — Key Difference
SNR example: A $10 free bet at 5.0 odds wins → you receive $40 profit (not $50).
SR example: A $10 free bet at 5.0 odds wins → you receive $50 (full return including stake).
Maximising Your Conversion Rate
The conversion rate tells you what percentage of the free bet face value you keep as profit. For SNR bets, higher odds convert better — the sweet spot is typically 4.0–6.0 odds. A $10 SNR free bet at these odds typically converts at 70–80%, yielding $7–$8 profit.
Step-by-Step
Enter the free bet amount
Select SNR or SR
Enter the back odds you'll place the free bet at
Enter the exchange lay odds and commission rate
The calculator shows your optimal lay stake and potential profit