A free, no-nonsense arbitrage betting calculator.
ArbSolver is a free arbitrage calculator that helps you determine the optimal stake distribution across multiple bookmakers to lock in a guaranteed profit. Enter the odds you found, set your total stake, and the calculator tells you exactly how much to bet on each outcome and what your guaranteed return will be.
Most arbitrage calculators online are cluttered with ads, require registration, or use incorrect profit formulas. We wanted a tool that is:
The calculator converts any odds format (decimal, American, fractional) to decimal, computes the implied probability of each outcome, sums them, and checks whether the combined probability is below 100%. If it is, an arbitrage opportunity exists. The tool then distributes your total stake proportionally across all outcomes so that each returns approximately the same amount, guaranteeing a profit regardless of the result.
The full mathematical explanation and a worked example are available on the calculator page.
ArbSolver is an independent project. It is not affiliated with any bookmaker, gambling operator, or affiliate network. The tool was built by a small team that believes useful web tools should be free, private, and actually work.
Arbitrage betting may be restricted or prohibited in your jurisdiction. This tool is for educational and mathematical purposes only. It does not constitute betting advice. Always check your local laws and the terms of service of any bookmaker you use. The calculations are mathematically correct but do not eliminate execution risk (odds changing, bets being voided, account limitations, etc.).