How the Arbitrage Calculator Works
The calculator converts American odds to decimal odds, computes the implied probability for each outcome, and sums them. When the total is below 100%, a mathematical guarantee of profit exists regardless of which side wins.
Example
DraftKings offers Team A at +130 (decimal 2.30). FanDuel offers Team B at +120 (decimal 2.20).
Implied probs: 1/2.30 + 1/2.20 = 0.4348 + 0.4545 = 0.8893 (88.93%)
An arb exists! Profit margin = (100 / 88.93) − 100 = 12.45%
On a $1,000 bankroll: guaranteed profit = $124.50
Stake on Team A: $488.60 | Stake on Team B: $511.40
What Is Arbitrage Betting?
Arbitrage betting (or "arbing") exploits pricing discrepancies between sportsbooks. When different books set sufficiently different lines on the same game, backing every possible outcome guarantees a profit regardless of the result.
It requires accounts at multiple sportsbooks, quick execution (odds move fast), and enough bankroll to cover all sides simultaneously. True arbs are rare and often last only minutes, but they represent risk-free profit when found.
Risks of Arbitrage Betting
Sportsbooks actively monitor for arb behavior and routinely limit or ban accounts that consistently exploit pricing gaps. Additionally, odds can shift before you place both sides, turning a guaranteed profit into a one-sided exposure. Arbitrage is most effective as a complement to a broader +EV strategy.
2-Way vs 3-Way Markets
Most US sports (NFL, NBA, MLB, NHL) use 2-way markets — one team wins. European soccer uses 3-way markets where a draw is a separate outcome. The calculator handles both — switch to 3-Way and enter the draw odds to check soccer arbs.
Stop Hunting Arbs Manually
Sibyl's AI models analyze thousands of lines daily, flagging +EV picks and divergences before the market corrects. Smarter than arb hunting alone.
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