ARBITRAGE CALCULATOR
Free · no signup · runs entirely in your browser
Enter the best price you can get on each side of a two-way market. If the implied probabilities add up to less than 100%, an arbitrage exists and this splits your total stake to profit either way.
The maths: Arb exists when 1/d₁ + 1/d₂ < 1. Stake on side 1 = total x (1/d₁) / (1/d₁ + 1/d₂). Return = total / (1/d₁ + 1/d₂).
FAQ
What is arbitrage betting?
Backing every outcome of a market at prices that guarantee a profit, which happens when different books disagree enough that the implied probabilities total under 100%.
How do I know if an arb exists?
Convert both prices to implied probability (1 divided by decimal odds) and add them. Under 100% is an arb; the gap is your margin.
Why do arbs disappear so fast?
Books move prices quickly and limit or restrict accounts that consistently take them. Treat the margin as theoretical until both bets are actually accepted.
Built by CAPTRACKER, which tracks public handicappers and settles every pick automatically against the final score. If you are about to follow someone's picks, look up their record first.