Arb Betting Calculator

Arbitrage Betting Calculator

Enter values and click 'Calculate Arbitrage'.

Calculation Results:

Arbitrage Percentage: –

Stake on Outcome 1: –

Stake on Outcome 2: –

Stake on Outcome 3: –

Guaranteed Profit: –

Return on Investment (ROI): –

function calculateArbBet() { var totalStake = parseFloat(document.getElementById('totalStake').value); var odds1 = parseFloat(document.getElementById('odds1').value); var odds2 = parseFloat(document.getElementById('odds2').value); var odds3Input = document.getElementById('odds3').value; var odds3 = parseFloat(odds3Input); var arbResultDiv = document.getElementById('arbResult'); var arbPercentageSpan = document.getElementById('arbPercentage'); var stake1Span = document.getElementById('stake1'); var stake2Span = document.getElementById('stake2'); var stake3Span = document.getElementById('stake3'); var guaranteedProfitSpan = document.getElementById('guaranteedProfit'); var roiSpan = document.getElementById('roi'); // Reset previous results arbPercentageSpan.textContent = '-'; stake1Span.textContent = '-'; stake2Span.textContent = '-'; stake3Span.textContent = '-'; guaranteedProfitSpan.textContent = '-'; roiSpan.textContent = '-'; arbResultDiv.style.backgroundColor = '#e9f7ef'; arbResultDiv.style.color = '#28a745'; arbResultDiv.textContent = 'Enter values and click \'Calculate Arbitrage\'.'; if (isNaN(totalStake) || totalStake <= 0) { arbResultDiv.textContent = 'Please enter a valid Total Investment.'; arbResultDiv.style.backgroundColor = '#ffe0e0'; arbResultDiv.style.color = '#d9534f'; return; } if (isNaN(odds1) || odds1 1).'; arbResultDiv.style.backgroundColor = '#ffe0e0'; arbResultDiv.style.color = '#d9534f'; return; } if (isNaN(odds2) || odds2 1).'; arbResultDiv.style.backgroundColor = '#ffe0e0'; arbResultDiv.style.color = '#d9534f'; return; } var impliedProb1 = 1 / odds1; var impliedProb2 = 1 / odds2; var impliedProb3 = 0; // Default for 2-way bet var isThreeWay = !isNaN(odds3) && odds3 > 1; if (isThreeWay) { impliedProb3 = 1 / odds3; } else if (odds3Input.trim() !== ") { // If something was entered but it's not a valid number > 1 arbResultDiv.textContent = 'Please enter valid Odds for Outcome 3 (must be > 1) or leave blank.'; arbResultDiv.style.backgroundColor = '#ffe0e0'; arbResultDiv.style.color = '#d9534f'; return; } var arbitragePercentage = (impliedProb1 + impliedProb2 + impliedProb3) * 100; arbPercentageSpan.textContent = arbitragePercentage.toFixed(2) + '%'; if (arbitragePercentage >= 100) { arbResultDiv.textContent = 'No Arbitrage Opportunity (Arbitrage % is ' + arbitragePercentage.toFixed(2) + '%)'; arbResultDiv.style.backgroundColor = '#ffe0e0'; arbResultDiv.style.color = '#d9534f'; return; } arbResultDiv.textContent = 'Arbitrage Opportunity Found! (Arbitrage % is ' + arbitragePercentage.toFixed(2) + '%)'; arbResultDiv.style.backgroundColor = '#e9f7ef'; arbResultDiv.style.color = '#28a745'; var totalImpliedProb = impliedProb1 + impliedProb2 + impliedProb3; var stake1 = (totalStake * impliedProb1) / totalImpliedProb; var stake2 = (totalStake * impliedProb2) / totalImpliedProb; var stake3 = (totalStake * impliedProb3) / totalImpliedProb; var guaranteedReturn = stake1 * odds1; // Should be the same for all outcomes var guaranteedProfit = guaranteedReturn – totalStake; var roi = (guaranteedProfit / totalStake) * 100; stake1Span.textContent = '$' + stake1.toFixed(2); stake2Span.textContent = '$' + stake2.toFixed(2); if (isThreeWay) { stake3Span.textContent = '$' + stake3.toFixed(2); } else { stake3Span.textContent = 'N/A (2-way bet)'; } guaranteedProfitSpan.textContent = '$' + guaranteedProfit.toFixed(2); roiSpan.textContent = roi.toFixed(2) + '%'; }

Understanding Arbitrage Betting

Arbitrage betting, often referred to as "surebetting," is a strategy in sports betting where a bettor places wagers on all possible outcomes of an event with different bookmakers, guaranteeing a profit regardless of the event's result. This is possible when discrepancies in odds offered by various bookmakers create a situation where the combined implied probability of all outcomes is less than 100%.

How Arbitrage Betting Works

Bookmakers set their odds independently, and sometimes, due to different opinions, market movements, or errors, their odds for the same event can diverge significantly. An arbitrage opportunity arises when you can bet on Team A to win with Bookmaker X, and on Team B to win (or Draw, in a three-way market) with Bookmaker Y, such that your total payout from any outcome exceeds your total investment.

The core principle relies on the "overround" or "bookmaker's margin." Normally, if you sum the implied probabilities of all outcomes offered by a single bookmaker, it will be slightly over 100% (e.g., 105%), which is how they ensure profit. An arbitrage situation occurs when, by combining odds from *different* bookmakers, this sum falls *below* 100%.

Using the Arbitrage Betting Calculator

Our Arbitrage Betting Calculator simplifies the process of identifying and executing surebets. Here's how to use it:

  • Total Investment ($): Enter the total amount of money you are willing to stake across all outcomes for this particular arbitrage opportunity.
  • Outcome 1 Odds (Decimal): Input the decimal odds offered by a bookmaker for the first possible outcome (e.g., Team A wins).
  • Outcome 2 Odds (Decimal): Input the decimal odds offered by a different bookmaker for the second possible outcome (e.g., Team B wins).
  • Outcome 3 Odds (Decimal – Optional for 3-way bets): If it's a three-way market (e.g., Football match with Home Win, Draw, Away Win), enter the odds for the third outcome. Leave this field blank for two-way markets (e.g., Tennis match).

Click "Calculate Arbitrage" to see the results.

Understanding the Results

  • Arbitrage Percentage: This is the sum of the implied probabilities of all outcomes. If this value is less than 100%, an arbitrage opportunity exists. The lower the percentage (e.g., 98%), the higher the potential profit.
  • Stake on Outcome 1, 2, (and 3): These are the precise amounts you need to bet on each outcome to guarantee an equal profit regardless of which outcome occurs.
  • Guaranteed Profit: The absolute profit you will make from this arbitrage bet, regardless of the event's result.
  • Return on Investment (ROI): Your guaranteed profit expressed as a percentage of your total investment.

Example Calculation:

Let's say you have a total investment of $100 for a basketball game (2-way market):

  • Bookmaker A offers odds of 2.10 for Team X to win.
  • Bookmaker B offers odds of 2.00 for Team Y to win.

Using the calculator:

  • Total Investment: $100
  • Outcome 1 Odds: 2.10
  • Outcome 2 Odds: 2.00
  • Outcome 3 Odds: (Leave blank)

The calculator would output:

  • Arbitrage Percentage: ~97.62% (indicating an arbitrage opportunity)
  • Stake on Outcome 1 (Team X): ~$47.62
  • Stake on Outcome 2 (Team Y): ~$50.00
  • Guaranteed Profit: ~$2.38
  • Return on Investment (ROI): ~2.38%

This means if you bet $47.62 on Team X at 2.10 odds and $50.00 on Team Y at 2.00 odds (total $97.62 invested), you would get a return of $100.00 regardless of the winner, securing a $2.38 profit.

Risks and Considerations:

While arbitrage betting sounds like a foolproof way to profit, it comes with risks:

  • Odds Changes: Odds can change rapidly. An arbitrage opportunity might disappear before you can place all your bets.
  • Bookmaker Limits: Bookmakers may limit your stake, preventing you from placing the full required amount on one side of the arb.
  • Voided Bets: If one bookmaker voids a bet (e.g., due to an obvious error in odds), you could be left with a single bet on the other outcome, exposing you to risk.
  • Account Restrictions: Bookmakers are generally not fond of arbitrage bettors and may limit or close accounts that consistently engage in this practice.
  • Decimal Precision: Small rounding errors can impact profitability, especially with very small arbitrage percentages.

Always exercise caution and understand the terms and conditions of each bookmaker when engaging in arbitrage betting.

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