See how much cash you extract from a stake-not-returned bonus bet.
Arbitrage Calculator
Find guaranteed profit opportunities across two bookmakers.
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ARB FOUND
Stake on Outcome 1
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Stake on Outcome 2
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Guaranteed Profit
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ROI
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Back & Lay Calculator
Calculate lay stakes for Betfair exchange hedging. Back at a bookmaker, lay on the exchange.
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%
Lay Stake
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Profit if Back Wins
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Profit if Lay Wins
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Betfair Liability
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Bonus Bet Turnover Calculator
Convert bonus/free bets into guaranteed cash. Bonus bet stake is not returned — only profit.
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%
Lay Stake
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Guaranteed Profit
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Retention %
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Betfair Liability
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No Vig / Fair Odds Calculator
Remove the bookmaker's margin to find true fair odds and probabilities.
Fair Odds 1
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Fair Odds 2
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Fair Odds 3
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True Prob 1
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True Prob 2
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True Prob 3
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Overround
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Vig / Margin
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Vig Calculator
See exactly how much the bookmaker is taking from both sides of a two-way market.
Bookmaker's Edge
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Vig / Margin
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Overround
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Fair Odds 1
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Fair Odds 2
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Implied Prob 1
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Implied Prob 2
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True Prob 1
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True Prob 2
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Kelly Criterion Calculator
Determine optimal bet sizing based on your edge and bankroll.
%
$
+EV BET
Full Kelly %
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Recommended Stake
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Expected Value / Bet
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Edge %
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Conservative Sizing
Quarter Kelly
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Half Kelly
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Full Kelly
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Expected Value Calculator
Determine whether a bet has positive expected value (+EV).
%
$
+EV BET
Expected Value
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EV % per Bet
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Break-even Probability
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Your Edge
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Odds Converter
Enter odds in any format — decimal (2.50), fractional (3/2), or American (+150 / -200).
Decimal
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Fractional
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American
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Implied Probability
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Common Odds Reference
Decimal
Fractional
American
Implied Prob.
1.50
1/2
-200
66.67%
1.80
4/5
-125
55.56%
1.91
10/11
-110
52.36%
2.00
1/1
+100
50.00%
2.50
3/2
+150
40.00%
3.00
2/1
+200
33.33%
4.00
3/1
+300
25.00%
5.00
4/1
+400
20.00%
10.00
9/1
+900
10.00%
21.00
20/1
+2000
4.76%
Hedge / Cash Out Calculator
Lock in a guaranteed profit on an existing bet by hedging the opposite outcome.
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Hedge Stake
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Profit if Original Wins
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Profit if Hedge Wins
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Guaranteed Profit
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A stake-not-returned (SNR) bonus bet returns only the winnings, not the stake. This calculator works out the lay stake that converts the largest possible share of that bonus into withdrawable cash.
How to use it
Enter the bonus bet amount the bookmaker gave you.
Enter the back odds you plan to use at the bookmaker.
Enter the lay odds on the exchange and the commission.
Read the lay stake and your guaranteed cash retention.
Worked example. A $50 SNR bonus placed at back odds 5.00, laid at 5.20 with 5% commission converts to roughly $38 of real cash, about a 76% retention. Higher back odds generally lift the retention rate.
Finding the best-priced pairings across the market is the slow part by hand. The DegenToPro bonus bet finder does it automatically. Learn the wider strategy on the promo betting and matched betting pages.
Frequently asked questions
What retention rate should I aim for on a bonus bet?
Around 70% to 80% is typical for a well-matched SNR bonus. Using higher back odds increases retention but also increases variance on the exchange, so most people sit in the mid range.
Why do higher odds convert more of the bonus?
Because the stake is not returned, more of your return comes from winnings at higher odds, so a larger share of the bonus face value ends up as cash. The calculator shows the exact figure for your inputs.
Are bonus bet profits taxed in Australia?
Gambling winnings are generally not taxed for recreational bettors under current ATO treatment. This is general information, not tax advice.