What arbitrage betting is
Arbitrage (arbing) means betting every outcome of an event at different sportsbooks, at odds that guarantee a profit whatever happens. It's possible when sportsbooks disagree on a price.
Arbitrage betting calculator
Enter the best odds for each outcome, usually from different sportsbooks. See whether they add up to a guaranteed profit, and exactly how much to stake on each side.
Side A47.6% · 2.10
Side B50.5% · 1.98
Guaranteed profit$1.92
Return (%)1.92%
Stake on side A$48.53
Stake on side B$51.47
The odds add up to 98.11% implied, under 100%, so these stakes return $101.92 whichever side wins. Odds move fast, and sportsbooks can limit accounts that arb, so check both prices before you bet.
For information only. Results use the odds you enter and don't include any sportsbook rules or limits.
How it works
Arbitrage calculator: the basics
How to spot an arb
Add up the implied probability of the best odds for every outcome. If the total is under 100%, there's an arbitrage. +110 and -102 add up to 98.1%, a return of about 1.9%.
Sizing the stakes
Each stake is your total stake times that outcome's implied probability, divided by the total implied. That way every outcome returns the same amount.
The risks
Odds can change before you place both bets, sportsbooks can void bets on obvious errors, and many limit accounts that arb regularly. Place the harder bet first and check every price.
Related guides: What is closing line value (CLV)?
Terms used here: Arbitrage · Line shopping · Implied probability · Full glossary
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FAQ
Arbitrage calculator questions
Is arbitrage betting legal?
Generally, yes. But it's often against sportsbooks' terms, and they can limit or close accounts that arb regularly.
How much can you make from arbitrage betting?
Most arbs return 1% to 5% of the total stake. Profit comes from volume and speed, not single bets.
Does it work for three-way markets?
Yes. Add a draw price for soccer and other three-way markets. The total implied probability of all three needs to be under 100%.