Split your stake across two bookmakers to lock in a guaranteed profit.
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.
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$
+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).
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$
+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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An arbitrage bet (or surebet) covers every outcome of a market across two bookmakers whose combined prices leave a gap. Enter both odds and your total stake above and the calculator splits the stake so you win the same amount no matter which side lands.
How to use it
Enter the best available decimal odds for outcome A at one bookmaker.
Enter the best available decimal odds for outcome B at a second bookmaker.
Enter the total amount you want to stake.
Read the stake to place on each side, plus the arbitrage percentage and guaranteed return.
Worked example. Bookmaker A prices outcome A at 2.10, Bookmaker B prices outcome B at 2.10. With $100 total you stake roughly $50 on each side. Whichever wins returns about $105, a locked profit of around $5 (a 5% arb) regardless of the result.
Arbs are rare and short-lived because bookmakers move their prices quickly. A tool that scans the market continuously finds them for you, which is what the DegenToPro arbitrage finder does across 100+ Australian bookmakers.
Frequently asked questions
Is arbitrage betting legal in Australia?
Yes. Placing bets at licensed Australian bookmakers is legal, and covering both sides of a market across two books is not against the law. Individual bookmakers may limit accounts they identify as arbers.
Is an arbitrage bet really guaranteed?
The return is locked once both legs are placed at the shown odds. The practical risks are execution: a price moving before you get the second leg on, a bet being voided, or a stake limit. Place the shorter-lived leg first.
What arbitrage percentage is worth taking?
Most sustainable arbs sit in the 1% to 5% range. Higher figures usually mean a palpable error or a price about to be pulled, so double check before staking.