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Use the Parlay Calculator by BetDiamonds to instantly calculate combined odds and potential payout for multi-leg bets. Add as many legs as you want and see your total return based on your stake.

Parlay Calculator | Calculate Total Odds and Payout for Multi-Leg Bets

Casino roulette, colorful poker chips and dice floating in mid air in red bokeh background. Illustration of the concept of gambling

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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>Parlay Calculator | BetDiamonds</title>
  <style>
    :root {
      --primary: #4285f4;
      --primary-dark: #3367d6;
      --danger: #ea4335;
      --text: #202124;
      --text-light: #5f6368;
      --background: #f8f9fa;
      --card-bg: #ffffff;
      --border-radius: 12px;
      --box-shadow: 0 2px 10px rgba(0,0,0,0.08);
      --input-border: #dadce0;
      --input-focus: rgba(66, 133, 244, 0.2);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
      background: var(--background);
      color: var(--text);
      line-height: 1.5;
      padding: 1rem;
      min-height: 100vh;
    }

    .container {
      max-width: 500px;
      margin: 0 auto;
    }

    h1 {
      text-align: center;
      color: var(--text);
      font-size: 1.5rem;
      margin-bottom: 1.5rem;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--border-radius);
      box-shadow: var(--box-shadow);
      padding: 1.25rem;
      margin-bottom: 1.25rem;
    }

    label {
      display: block;
      margin-bottom: 0.5rem;
      font-weight: 500;
      color: var(--text);
    }

    input[type="number"] {
      width: 100%;
      padding: 0.875rem;
      font-size: 1rem;
      border: 1px solid var(--input-border);
      border-radius: var(--border-radius);
      background: #fff;
      transition: all 0.2s;
    }

    input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px var(--input-focus);
    }

    button {
      font-size: 1rem;
      font-weight: 500;
      border: none;
      border-radius: var(--border-radius);
      cursor: pointer;
      transition: all 0.2s;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
    }

    button:active {
      transform: scale(0.98);
    }

    .btn-primary {
      padding: 1rem;
      background: var(--primary);
      color: white;
      width: 100%;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
    }

    .btn-secondary {
      padding: 0.75rem;
      background: #f1f3f4;
      color: var(--text);
      margin-top: 0.5rem;
      width: 100%;
    }

    .btn-danger {
      padding: 0 0.75rem;
      background: var(--danger);
      color: white;
      height: 44px;
      width: 44px;
    }

    #oddsContainer {
      margin: 1rem 0;
    }

    .odds-group {
      display: flex;
      gap: 0.5rem;
      margin-bottom: 0.75rem;
      align-items: center;
    }

    .odds-group input {
      flex: 1;
    }

    #resultBox {
      display: none;
      background: var(--card-bg);
      border-radius: var(--border-radius);
      box-shadow: var(--box-shadow);
      padding: 1.25rem;
      margin-top: 1rem;
    }

    .result-item {
      margin-bottom: 1rem;
      padding-bottom: 1rem;
      border-bottom: 1px solid #eee;
    }

    .result-item:last-child {
      border-bottom: none;
      margin-bottom: 0;
      padding-bottom: 0;
    }

    .result-label {
      font-weight: 500;
      color: var(--text-light);
      margin-bottom: 0.25rem;
    }

    .result-value {
      font-size: 1.25rem;
      font-weight: 600;
    }

    .error {
      color: var(--danger);
      font-weight: 500;
      padding: 1rem;
      background: rgba(234, 67, 53, 0.1);
      border-radius: var(--border-radius);
      margin-bottom: 1rem;
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>💥 Parlay Calculator</h1>

    <div class="card">
      <form id="parlayForm">
        <label for="stake">Stake Amount ($)</label>
        <input type="number" id="stake" step="0.01" min="0" value="10" required placeholder="Enter your stake amount">

        <div id="oddsContainer">
          <div class="odds-group">
            <input type="number" class="odds-input" step="0.01" min="1" placeholder="Leg 1 Odds" required>
            <button type="button" class="btn-danger" onclick="removeLeg(this)" disabled>✖</button>
          </div>
        </div>

        <button type="button" class="btn-secondary" onclick="addLeg()">
          ➕ Add Another Leg
        </button>
        
        <button type="submit" class="btn-primary">
          Calculate Parlay
        </button>
      </form>
    </div>

    <div id="resultBox"></div>
  </div>

  <script>
    document.addEventListener('DOMContentLoaded', function() {
      const oddsContainer = document.getElementById('oddsContainer');
      const parlayForm = document.getElementById('parlayForm');
      const resultBox = document.getElementById('resultBox');

      function addLeg() {
        const count = oddsContainer.children.length + 1;
        const div = document.createElement('div');
        div.className = 'odds-group';
        div.innerHTML = `
          <input type="number" class="odds-input" step="0.01" min="1" placeholder="Leg ${count} Odds" required>
          <button type="button" class="btn-danger" onclick="removeLeg(this)">✖</button>
        `;
        oddsContainer.appendChild(div);
        
        // Scroll to the newly added input for better mobile UX
        setTimeout(() => {
          div.querySelector('input').focus();
        }, 100);
      }

      function removeLeg(button) {
        button.parentElement.remove();
        // Update the placeholders of remaining legs
        const legs = document.querySelectorAll('.odds-input');
        legs.forEach((leg, index) => {
          leg.placeholder = `Leg ${index + 1} Odds`;
        });
      }

      parlayForm.addEventListener('submit', function(e) {
        e.preventDefault();

        const stake = parseFloat(document.getElementById('stake').value);
        const oddsInputs = document.querySelectorAll('.odds-input');
        
        // Clear any previous error highlights
        oddsInputs.forEach(input => {
          input.style.borderColor = '';
        });

        // Validate inputs
        if (isNaN(stake)) {
          showError("Please enter a valid stake amount");
          return;
        }
        
        if (stake <= 0) {
          showError("Stake amount must be greater than 0");
          return;
        }
        
        if (oddsInputs.length === 0) {
          showError("Please add at least one leg to your parlay");
          return;
        }

        let totalOdds = 1;
        let allValid = true;
        let oddsValues = [];
        
        oddsInputs.forEach((input, index) => {
          const val = parseFloat(input.value);
          if (isNaN(val) || val < 1) {
            allValid = false;
            input.style.borderColor = "var(--danger)";
          } else {
            input.style.borderColor = "";
            oddsValues.push(val);
            totalOdds *= val;
          }
        });

        if (!allValid) {
          showError("Please enter valid odds (≥ 1.00) for all legs");
          return;
        }

        const payout = (stake * totalOdds).toFixed(2);
        const profit = (stake * totalOdds - stake).toFixed(2);
        
        showResult(`
          <div class="result-item">
            <div class="result-label">Number of Legs</div>
            <div class="result-value">${oddsValues.length}</div>
          </div>
          
          <div class="result-item">
            <div class="result-label">Total Combined Odds</div>
            <div class="result-value">${totalOdds.toFixed(2)}</div>
          </div>
          
          <div class="result-item">
            <div class="result-label">Potential Payout</div>
            <div class="result-value">$${payout}</div>
          </div>
          
          <div class="result-item">
            <div class="result-label">Potential Profit</div>
            <div class="result-value">$${profit}</div>
          </div>
        `);
      });

      function showError(message) {
        resultBox.innerHTML = `<div class="error">${message}</div>`;
        resultBox.style.display = 'block';
        resultBox.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
      }

      function showResult(content) {
        resultBox.innerHTML = content;
        resultBox.style.display = 'block';
        resultBox.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
      }

      // Make functions globally available
      window.addLeg = addLeg;
      window.removeLeg = removeLeg;
    });
  </script>
</body>
</html>