The arbitrage calculator helps you split a total stake across multiple outcomes to lock in a guaranteed return when market prices create an arb. To use it, choose your odds format, enter your total staking amount, add each outcome price, and optionally apply a rounding value if you need sportsbook-friendly bet sizes. For example, if Team A is +110 at one book and Team B is +110 at another, you can enter both lines with a $100 stake and the calculator will show how much to place on each side to secure a profit regardless of the result. It is a practical way to confirm an arbitrage opportunity and size every leg correctly before you bet.