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Use the Rake Calculator by BetDiamonds to calculate bookmaker margin (rake) from 2-way or 3-way betting odds. Instantly see implied probabilities and market fairness.

Rake Calculator | Calculate Bookmaker Margin from Odds

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
  <title>Rake Calculator | BetDiamonds</title>
  <style>
    :root {
      --primary-color: #4285f4;
      --success-color: #34a853;
      --warning-color: #ea4335;
      --text-color: #333;
      --light-gray: #f5f5f5;
      --medium-gray: #e0e0e0;
      --border-radius: 8px;
      --box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
      padding: 1rem;
      background: var(--light-gray);
      margin: 0;
      color: var(--text-color);
      line-height: 1.5;
    }
    
    .container {
      max-width: 600px;
      margin: 0 auto;
      padding: 0 0.5rem;
    }

    h1 {
      text-align: center;
      color: var(--text-color);
      font-size: 1.5rem;
      margin-bottom: 1.5rem;
    }

    form {
      background: #fff;
      padding: 1.25rem;
      border-radius: var(--border-radius);
      box-shadow: var(--box-shadow);
      margin-bottom: 1.25rem;
    }

    label {
      display: block;
      margin-bottom: 1rem;
      font-weight: 500;
    }

    input[type="number"], select {
      width: 100%;
      padding: 0.75rem;
      margin-top: 0.5rem;
      font-size: 1rem;
      border: 1px solid var(--medium-gray);
      border-radius: var(--border-radius);
      -webkit-appearance: none;
    }
    
    input:focus, select:focus {
      outline: none;
      border-color: var(--primary-color);
      box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2);
    }

    .button-group {
      display: flex;
      gap: 0.75rem;
      margin-top: 1.25rem;
    }

    button {
      flex: 1;
      padding: 0.75rem;
      font-size: 1rem;
      font-weight: 500;
      border: none;
      border-radius: var(--border-radius);
      cursor: pointer;
      transition: all 0.2s;
    }
    
    button:active {
      transform: scale(0.98);
    }

    button[type="submit"] {
      background: var(--primary-color);
      color: white;
    }
    
    button[type="submit"]:hover {
      background: #3367d6;
    }

    #clearBtn {
      background: #f1f1f1;
      color: var(--text-color);
    }
    
    #clearBtn:hover {
      background: #e0e0e0;
    }

    #resultBox {
      background: #fff;
      padding: 1.25rem;
      border-radius: var(--border-radius);
      box-shadow: var(--box-shadow);
      margin-bottom: 1rem;
    }

    .highlight {
      font-weight: bold;
      color: var(--success-color);
    }

    .warning {
      color: var(--warning-color);
      font-weight: 500;
    }
    
    .result-item {
      margin-bottom: 0.75rem;
      padding-bottom: 0.75rem;
      border-bottom: 1px solid var(--medium-gray);
    }
    
    .result-item:last-child {
      border-bottom: none;
      margin-bottom: 0;
      padding-bottom: 0;
    }

    .formula {
      font-family: monospace;
      background: var(--light-gray);
      padding: 0.75rem;
      border-radius: 4px;
      margin-top: 1rem;
      font-size: 0.9rem;
      overflow-x: auto;
    }
    
    .summary {
      font-weight: 500;
      margin-top: 1rem;
      padding: 0.75rem;
      border-radius: 4px;
    }
    
    .success-summary {
      background-color: rgba(52, 168, 83, 0.1);
      border-left: 4px solid var(--success-color);
    }
    
    .warning-summary {
      background-color: rgba(234, 67, 53, 0.1);
      border-left: 4px solid var(--warning-color);
    }
    
    @media (min-width: 768px) {
      body {
        padding: 2rem;
      }
      
      h1 {
        font-size: 1.75rem;
      }
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>📉 Rake Calculator</h1>

    <form id="rakeForm">
      <label>Select Market Type:
        <select id="marketType">
          <option value="2">2 Outcomes (e.g. Over/Under)</option>
          <option value="3">3 Outcomes (e.g. 1X2)</option>
        </select>
      </label>

      <div id="oddsInputs">
        <label>Option 1 Odds:
          <input type="number" id="odds1" step="0.01" min="1" required placeholder="Enter decimal odds" />
        </label>
        <label>Option 2 Odds:
          <input type="number" id="odds2" step="0.01" min="1" required placeholder="Enter decimal odds" />
        </label>
      </div>

      <div class="button-group">
        <button type="submit">Calculate Rake</button>
        <button type="button" id="clearBtn">Clear</button>
      </div>
    </form>

    <div id="resultBox" style="display: none;"></div>
  </div>

  <script>
    const marketType = document.getElementById('marketType');
    const oddsInputs = document.getElementById('oddsInputs');
    const resultBox = document.getElementById('resultBox');
    const clearBtn = document.getElementById('clearBtn');

    // Update form inputs when market type changes
    marketType.addEventListener('change', () => {
      const type = marketType.value;
      oddsInputs.innerHTML = `
        <label>Option 1 Odds:
          <input type="number" id="odds1" step="0.01" min="1" required placeholder="Enter decimal odds" />
        </label>
        <label>Option 2 Odds:
          <input type="number" id="odds2" step="0.01" min="1" required placeholder="Enter decimal odds" />
        </label>
        ${type === "3" ? `
        <label>Option 3 Odds:
          <input type="number" id="odds3" step="0.01" min="1" required placeholder="Enter decimal odds" />
        </label>` : ''}
      `;
    });

    // Handle form submission
    document.getElementById('rakeForm').addEventListener('submit', function (e) {
      e.preventDefault();

      const type = marketType.value;
      const odds1 = parseFloat(document.getElementById('odds1').value);
      const odds2 = parseFloat(document.getElementById('odds2').value);
      const odds3 = type === "3" ? parseFloat(document.getElementById('odds3').value) : null;

      // Input validation
      if (!odds1 || !odds2 || (type === "3" && !odds3) || 
          odds1 < 1 || odds2 < 1 || (type === "3" && odds3 < 1)) {
        showResult(`<p class="warning">Please enter valid odds (≥ 1.00) for all options.</p>`);
        return;
      }

      // Calculate implied probabilities
      const implied1 = 100 / odds1;
      const implied2 = 100 / odds2;
      const implied3 = odds3 ? 100 / odds3 : 0;

      const total = implied1 + implied2 + implied3;
      const rake = (total - 100).toFixed(2);

      // Build result display
      let result = `
        <div class="result-item">
          Option 1 Implied Probability: <strong>${implied1.toFixed(2)}%</strong>
        </div>
        <div class="result-item">
          Option 2 Implied Probability: <strong>${implied2.toFixed(2)}%</strong>
        </div>
      `;

      if (type === "3") {
        result += `
          <div class="result-item">
            Option 3 Implied Probability: <strong>${implied3.toFixed(2)}%</strong>
          </div>
        `;
      }

      result += `
        <div class="result-item">
          Total Market Percentage: <strong>${total.toFixed(2)}%</strong>
        </div>
        <div class="result-item">
          Bookmaker Rake: <strong class="${rake > 5 ? 'warning' : 'highlight'}">${rake}%</strong>
        </div>
        <div class="formula">
          Rake Formula: (1 / Odds1 + 1 / Odds2${type === "3" ? " + 1 / Odds3" : ""}) × 100 − 100
        </div>
      `;

      // Add summary based on rake value
      if (rake > 5) {
        result += `
          <div class="summary warning-summary">
            <p class="warning">⚠️ High rake detected (${rake}%). These odds may be overpriced by the bookmaker.</p>
          </div>
        `;
      } else {
        result += `
          <div class="summary success-summary">
            <p class="highlight">✅ Fair market with low bookmaker rake (${rake}%).</p>
          </div>
        `;
      }

      showResult(result);
    });

    // Clear form and results
    clearBtn.addEventListener('click', () => {
      document.getElementById('rakeForm').reset();
      resultBox.style.display = 'none';
      resultBox.innerHTML = '';
      marketType.dispatchEvent(new Event('change'));
    });

    // Helper function to display results
    function showResult(content) {
      resultBox.innerHTML = content;
      resultBox.style.display = 'block';
      
      // Scroll to results for better mobile experience
      resultBox.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
    }
  </script>
</body>
</html>