Arbitrage betting calculator
Put the best price for each outcome into its own column. If the prices leave a gap, you'll see what to stake on each side so the result doesn't matter.
Free surebets from our daily scan. See the picks
Why two bookmakers can both be "wrong"
Each bookmaker prices a match on its own. When one moves late, the best price on each side can add up to less than 100% implied probability. Add 1 ÷ odds for every outcome: if the total is under 1, you can cover them all and still come out ahead.
L = 1/odds₁ + 1/odds₂ (+ 1/odds₃)
The window is short. Odds usually move within minutes, so check both prices again right before you place anything.
Common questions
Is arbitrage betting legal?
In most countries, yes: you are placing ordinary bets at different bookmakers. Bookmakers don't like it, though, and may limit or close accounts that arb often. Check the rules where you live.
What is L?
The sum of 1 ÷ odds over every outcome, which is the total implied probability. Under 1 means the prices leave a margin for you; the lower it is, the bigger the margin.
Why are the stakes rounded?
A stake like 49.40 stands out to a bookmaker; 49 doesn't. The calculator rounds to whole numbers and shows the exact figure underneath, so you can see what rounding costs.
How much money do I need?
Margins are small; most arbs our scanner finds are under 1%. That means profit grows with the stake, but so does the damage if one leg goes wrong. Start small while you learn how fast odds move.