Arbitrage Calculator

Stop gambling and start investing. Mathematically guarantee a profit by exploiting odds discrepancies between different sportsbooks.

Wes Frank
Wes FrankFounder, EdgeSlip Analytics
Updated Dec 25, 2025
Fact Checked

Surebet Calculator

Guaranteed Profit Finder

Stealth Mode

Round stakes to nearest $1 to avoid detection.

Hedge Strategy

Bet Outcome 1
$278.23
Profit: +$10.08
Bet Outcome 2
$221.77
Profit: +$10.08
Guaranteed Net Profit+$10.08
ROI: 2.02%Invested: $500.00

Find arbs automatically: Our scanner finds hundreds of arbitrage opportunities across 15+ US sportsbooks every day.

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What is this tool?

Arbitrage betting (or 'arbing') is a strategy that involves covering all possible outcomes of a sporting event to guarantee a profit regardless of the result. This is possible when different sportsbooks have significantly different opinions (odds) on a game. This calculator determines the exact stakes required for each side to ensure your payout is identical and profitable no matter who wins.

How to use it

First, find an arbitrage opportunity manually or use our scanner. Enter the odds for Outcome A (e.g. Knicks +110) and Outcome B (e.g. Celtics +105). Enter your 'Total Investment' amount. The calculator will tell you exactly how much to bet on each side (e.g. $255 on Knicks, $245 on Celtics) and show you your guaranteed risk-free profit.

The Concept: Risk-Free Profit

In an efficient market, the sum of all probabilities in a game should equal 100% (plus the bookmaker's fee). However, when Book A and Book B disagree, that sum can sometimes drop below 100%. This gap is your profit margin.

FanDuel+110

Implied Probability: 47.6%

DraftKings+105

Implied Probability: 48.8%

Total Probability: 96.4% | Guaranteed Margin: 3.6%

The Arbitrage Formula

Calculating arbitrage involves two steps: first determining if an arb exists, and then calculating the "Biased Stakes" to equalize profit.

1. Find Arbitrage %Arbitrage % = (1 / OddsA) + (1 / OddsB)
If result < 100%, an arb exists.
2. Calculate Individual StakeStake A = (Total Investment x Implied Prob A) / Total Arbitrage %

Account Health & Safety

While arbitrage is risk-free financially, it is the quickest way to get your betting account limited ("gubbed"). Sportsbooks despise arbitrage bettors. To stay under the radar:

  • Round Your Stakes: Never bet specific amounts like $143.27. It screams "I am using a calculator." Round your bets to the nearest $5 (e.g. $145), even if it costs you a few cents of profit.
  • Avoid Main Lines vs Props: Arbing huge discrepancies on obscure Player Props is a red flag. Arbing Moneyline or Spread on major events (NFL/NBA) is safer.
  • Don't Max Bet: If you constantly hit the maximum wager limit, traders will review your account.

Frequently Asked Questions

Is arbitrage betting legal?▼
Yes, it is 100% legal. You are simply placing legitimate bets at different licensed sportsbooks. However, sportsbooks are private businesses and reserve the right to limit or ban customers they deem 'unprofitable' (i.e., sharp bettors).
How much money can I make?▼
Typical arbitrage opportunities range from 1% to 5% ROI per bet. While small, this compounds rapidly. If you turnover your bankroll once a day at 2% profit, that is 60% profit per month. It is a volume game.
What are the risks?▼
The main financial risks are: 1) Odds changing while you are placing the bets (leaving you with an uncovered leg), and 2) 'Palpable Errors' where a book voids a bet because the odds were obviously wrong (e.g., listing the Chiefs at +500 instead of -500).
Can I use this for 3-way markets?▼
Yes. While this specific calculator is optimized for 2-way markets (Head-to-Head), the math applies to 3-way markets (Win/Draw/Win) as well. You simply need to ensure the sum of implied probabilities for all 3 outcomes is less than 100%.
What is 'Stealth Mode' or rounding?▼
Stealth Mode refers to rounding your bet sizes to look like a recreational gambler. Instead of betting the mathematically perfect $123.45 to maximize profit, you bet $125. You sacrifice pennies in profit to avoid being flagged by the sportsbook's algorithm.
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