Arbitrage Calculator

Input the total stake and both american odds to calculate arbitrage

Odds Converter

Enter American Odds (-110 or +150):

Result: -

Sports Betting Arbitrage Guide

What is Sports Betting Arbitrage?

Arbitrage betting (also known as "sure betting" or "arbing") is a mathematically driven investment strategy. By identifying discrepancies in odds between different sportsbooks, a bettor can place wagers on every possible outcome of an event to lock in a 100% guaranteed profit, regardless of the final score.

While sportsbooks try to keep their odds aligned, the fast-moving nature of betting markets often creates small windows where an arbitrage opportunity exists.

How the Arbitrage Math Works

The secret to finding "Arbs" lies in the Market Hold (or "Vig"). Usually, sportsbooks bake in a 4-7% margin. Arbitrage happens when the combined Implied Probability of all outcomes is less than 100%.

1. Convert American Odds to Decimal

Positive Odds (+): (Odds / 100) + 1 | Example: +150 becomes 2.50

Negative Odds (-): (100 / |Odds|) + 1 | Example: -110 becomes 1.91


2. Calculate Implied Probability

Formula: P = (1 / Decimal Odds) × 100

Example: If Team A is 2.10 and Team B is 2.10, the total probability is 47.6% + 47.6% = 95.2%. Since this is under 100%, the 4.8% difference is your guaranteed profit.

Tips for Successful Arbing

  • Speed is Key: Odds change in seconds. Use our calculator to find your stakes fast.
  • Account Variety: You need accounts at multiple sportsbooks (FanDuel, DraftKings, BetMGM, etc.) to compare prices.
  • Watch for Limits: Sportsbooks don't like arbers. Avoid betting "odd" amounts like $154.32; try to round to $155 to stay under the radar.

Disclaimer: This Arbitrage Calculator is for educational and informational purposes only. While arbitrage is based on mathematical certainty, external factors such as sportsbook palpable errors (obvious odds mistakes), mid-bet odds shifts, or account limitations can pose risks.

Responsible Gambling: Please gamble responsibly. Betting should be fun, not a way to make a living. If you or someone you know has a gambling problem and wants help, call 1-800-GAMBLER or visit NCPG. Must be 21+ (or legal age in your jurisdiction) to participate in sports betting.