Enter the best odds for each outcome — at different bookmakers — and your total stake. If the implied probabilities sum below 100%, the calculator splits your stake for an equal, guaranteed return.
Sum the implied probabilities using the best available price for each outcome: Σ = 1/odds₁ + 1/odds₂ (+ 1/odds₃).
Example: 2.10 (book A) and 2.05 (book B). Σ = 0.4762 + 0.4878 = 0.9640 → a 3.73% arb. £100 splits £49.40 / £50.60 and returns £103.73 whichever side wins.
If you do arb, the one thing you can't skip is honest accounting of every leg — including the broken ones. That's exactly what scan-and-track is for: Zort logs both sides at both books and shows your true arb ROI, not the theoretical one.
Yes in the UK and most jurisdictions — it breaks no law. It does breach some bookmakers' terms, which is why accounts get limited or closed.
Arbitrage uses different bookmakers' best prices to cover all outcomes at a guaranteed profit. Dutching splits a stake across several selections in the same market (usually one book) for an equal payout — typically without covering every outcome.
Yes — "matched betting" is arbitrage where the bookmaker's promotion supplies the edge. The same stake-splitting maths applies with the free-bet value added to one side.
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