# BetArbi

> Free online betting calculators: surebet / arbitrage calculators for 2–15 outcomes, plus a free-bet calculator. Every tool runs entirely in the browser, needs no sign-up, and is free.

BetArbi helps bettors size their stakes for guaranteed-profit (arbitrage / surebet) opportunities and extract value from bookmaker free bets. A surebet exists when V = the sum of 1/odds across all outcomes is less than 1.

## Calculators
- [Surebet & Arbitrage Calculator](https://betarbi.com/): main calculator for 2–15 outcomes; splits a stake so every result returns an equal, guaranteed profit, and shows profitability.
- [2-Way Arbitrage Calculator](https://betarbi.com/2-way-arbitrage-calculator/): two-outcome markets (tennis, Over/Under, handicaps, moneyline without a draw).
- [3-Way Arbitrage Calculator](https://betarbi.com/3-way-arbitrage-calculator/): three-outcome 1X2 football markets (Home / Draw / Away).
- [4-Way Arbitrage Calculator](https://betarbi.com/4-way-arbitrage-calculator/): four-outcome markets.
- [5-Way Arbitrage Calculator](https://betarbi.com/5-way-arbitrage-calculator/): five-outcome markets.
- [6-Way Arbitrage Calculator](https://betarbi.com/6-way-arbitrage-calculator/): six-outcome markets (supports up to 15).
- [Free Bet Calculator](https://betarbi.com/free-bet-calculator/): the same engine plus a "Free bet" toggle per outcome. A free bet (stake not returned) returns (odds − 1) × stake and is not counted as cost; fix the free-bet amount and the other stakes are solved for equal profit.

## Key concepts
- Arbitrage / surebet: backing every outcome of an event across different bookmakers so any result yields a profit. Guaranteed when V = Σ(1/odds) < 1.
- Free bet (SNR — stake not returned): a bonus stake where, on a win, you keep only the winnings, not the token stake.

## About
- [Privacy & Cookie Policy](https://betarbi.com/privacy/)