Enter the two prices across different sportsbooks and how much you want to invest total. The calculator returns the exact stake for each side, the guaranteed profit, and the arb percentage if it is a real arb.
Arbitrage detected
+7.27%
ROI on total stake
Total implied prob
93.22%
Below 100% — profit guaranteed.
Side A
+125
Bet this much
$47.67
If this side wins:+$59.59
Side B
+105
Bet this much
$52.33
If this side wins:+$54.94
Total stake
$100.00
Guaranteed payout
$107.27
Guaranteed profit
$7.27
Arb ROI
7.27%
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How to use this
An arbitrage bet splits stake across two books so that no matter which side wins, you profit. It exists whenever the sum of the implied probabilities on the two sides is less than 100%. The tighter the hold against you, the smaller the arb. Real arbs usually live at < 3% ROI and disappear in seconds.
Find the two sides of a market priced on different books.
Paste the prices above.
Place side A's stake at book A and side B's stake at book B. Both bets fire at the same time.
Running multiple arbs in the same session will usually get you limited by at least one book. The Turtle +EV Arb Scanner finds these automatically across 48 books.
Frequently asked questions
What is sports betting arbitrage?+
An arbitrage bet (or arb) is a wager where you bet both sides of a market at different sportsbooks at prices that guarantee a profit no matter the outcome. The implied probabilities of both sides combined add up to less than 100%.
Is arbitrage betting legal?+
Arbitrage betting is legal in jurisdictions where sports betting itself is legal. However, sportsbooks dislike arb bettors and may limit or ban accounts that show consistent arb behavior. Most pro arb bettors rotate accounts and bet sizes carefully.
How much money can you make arbing?+
Most public arbs return 0.5%–2% per cycle. Scaling requires capital across multiple books and discipline with position sizing. Casual arbers earn 5–15% monthly ROI; full-time arbers do more by combining arbs with promo + +EV plays.
Why does this calculator say "not an arb"?+
If the combined implied probability of both sides exceeds 100%, no positive arb exists at those prices. Try checking sharp books like Pinnacle for one side and a softer book for the other — most arbs come from line lag between sharps and recreational books.
What are the risks of arbitrage betting?+
Account limits, line moves between bets (one side fills, other gets pulled), bonus restrictions on stake sizing, and stale odds. Always confirm both lines are still live before submitting the second bet.
Do you have a live arb scanner?+
Yes — Turtle +EV Pro members get a live arb scanner that monitors 48 books across 5 sports continuously. This calculator is for verifying any arb you find manually.
Calculators are free. The Turtle +EV picks platform runs every prop through a sport-specific model and ranks the ones where the line is mispriced. NBA · NHL · MLB · Soccer · Tennis. 48 books.