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Use the Value Bet Calculator by BetDiamonds to identify profitable betting opportunities. Enter your odds and estimated win probability to calculate expected value (EV) and make smarter bets.

Value Bet Calculator | Find Positive Expected Value Bets Instantly

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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>Value Bet Calculator | BetDiamonds</title>
  <style>
    :root {
      --primary: #4285f4;
      --primary-dark: #3367d6;
      --success: #34a853;
      --danger: #ea4335;
      --text: #333;
      --text-light: #666;
      --background: #f8f9fa;
      --card-bg: #ffffff;
      --border-radius: 12px;
      --box-shadow: 0 4px 12px rgba(0,0,0,0.08);
      --input-border: #dfe1e5;
      --input-focus: rgba(66, 133, 244, 0.3);
    }

    * {
      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: 1.6;
      padding: 1rem;
      min-height: 100vh;
    }

    .container {
      max-width: 500px;
      margin: 0 auto;
      padding: 0 0.5rem;
    }

    h1 {
      text-align: center;
      color: var(--text);
      font-size: 1.75rem;
      margin-bottom: 1.5rem;
      padding-top: 0.5rem;
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    .card {
      background: var(--card-bg);
      border-radius: var(--border-radius);
      box-shadow: var(--box-shadow);
      padding: 1.5rem;
      margin-bottom: 1.5rem;
    }

    label {
      display: block;
      margin-bottom: 1rem;
      font-weight: 500;
      color: var(--text);
    }

    .input-group {
      position: relative;
      margin-bottom: 1.25rem;
    }

    input {
      width: 100%;
      padding: 1rem;
      font-size: 1rem;
      border: 1px solid var(--input-border);
      border-radius: var(--border-radius);
      background: #fff;
      transition: all 0.2s;
      -webkit-appearance: none;
    }

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

    button {
      width: 100%;
      padding: 1rem;
      font-size: 1rem;
      font-weight: 500;
      background: var(--primary);
      color: white;
      border: none;
      border-radius: var(--border-radius);
      cursor: pointer;
      transition: all 0.2s;
      margin-top: 0.5rem;
    }

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

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

    #resultBox {
      display: none;
      margin-top: 1.5rem;
      padding: 1.5rem;
      background: var(--card-bg);
      border-radius: var(--border-radius);
      box-shadow: var(--box-shadow);
    }

    .result-item {
      margin-bottom: 1rem;
    }

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

    .positive {
      color: var(--success);
    }

    .negative {
      color: var(--danger);
    }

    .neutral {
      color: var(--text-light);
    }

    .error {
      color: var(--danger);
      font-weight: 500;
      padding: 1rem;
      background: rgba(234, 67, 53, 0.1);
      border-radius: var(--border-radius);
      margin-bottom: 1rem;
    }

    .info-text {
      font-size: 0.9rem;
      color: var(--text-light);
      margin-top: 0.25rem;
    }

    @media (max-width: 480px) {
      h1 {
        font-size: 1.5rem;
      }
      
      .card, #resultBox {
        padding: 1.25rem;
      }
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>🎯 Value Bet Calculator</h1>

    <div class="card">
      <form id="valueForm">
        <div class="input-group">
          <label for="odds">Decimal Odds</label>
          <input type="number" id="odds" step="0.01" min="1" required placeholder="e.g. 2.50" />
          <div class="info-text">Enter the bookmaker's odds (must be ≥ 1.00)</div>
        </div>

        <div class="input-group">
          <label for="probability">Estimated Win Probability (%)</label>
          <input type="number" id="probability" step="0.1" min="0" max="100" required placeholder="e.g. 45.5" />
          <div class="info-text">Your assessment of the true probability (0-100%)</div>
        </div>

        <button type="submit">Calculate Expected Value</button>
      </form>
    </div>

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

  <script>
    document.getElementById('valueForm').addEventListener('submit', function (e) {
      e.preventDefault();

      const odds = parseFloat(document.getElementById('odds').value);
      const probability = parseFloat(document.getElementById('probability').value);
      const resultBox = document.getElementById('resultBox');

      // Validate inputs
      if (isNaN(odds) {
        showError("Please enter valid decimal odds (must be ≥ 1.00)");
        return;
      }

      if (odds < 1) {
        showError("Decimal odds cannot be less than 1.00");
        return;
      }

      if (isNaN(probability) || probability < 0 || probability > 100) {
        showError("Please enter a valid probability between 0% and 100%");
        return;
      }

      // Calculate expected value
      const probabilityDecimal = probability / 100;
      const ev = (probabilityDecimal * odds) - 1;
      const evPercent = (ev * 100).toFixed(2);
      const isValueBet = ev > 0;

      // Display results
      resultBox.innerHTML = `
        <div class="result-item">
          <div>Bookmaker Odds:</div>
          <div class="result-value">${odds.toFixed(2)}</div>
        </div>
        
        <div class="result-item">
          <div>Your Probability Estimate:</div>
          <div class="result-value">${probability.toFixed(1)}%</div>
        </div>
        
        <div class="result-item">
          <div>Expected Value (EV):</div>
          <div class="result-value ${isValueBet ? 'positive' : 'negative'}">
            ${ev > 0 ? '+' : ''}${evPercent}%
          </div>
        </div>
        
        <div class="result-item">
          <div>Bet Recommendation:</div>
          <div class="result-value ${isValueBet ? 'positive' : 'negative'}">
            ${isValueBet ? '✅ VALUE BET (+EV)' : '❌ NOT A VALUE BET (-EV)'}
          </div>
        </div>
      `;

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

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