Calculate Heart Rate Zones for Running

Heart Rate Zones Calculator for Running

Understanding your heart rate zones is crucial for effective running training. These zones help you train at different intensities, targeting specific physiological adaptations. Below, you can calculate your personalized heart rate zones based on your maximum heart rate.

You can estimate this using the formula 220 – Age, or through a fitness test.

Your Heart Rate Training Zones

Understanding Your Heart Rate Zones:

  • Zone 1 (Very Light): 50-60% of Max HR. This is recovery pace, good for warm-ups and cool-downs.
  • Zone 2 (Light): 60-70% of Max HR. This is your aerobic base building zone, improving endurance.
  • Zone 3 (Moderate): 70-80% of Max HR. This improves aerobic capacity and develops speed endurance.
  • Zone 4 (Hard): 80-90% of Max HR. This increases your lactate threshold and improves anaerobic performance.
  • Zone 5 (Maximum): 90-100% of Max HR. This is for short bursts of maximum effort, improving VO2 max and top-end speed.

Note: These are general guidelines. Individual responses to training can vary. Consider consulting a coach or medical professional for personalized advice.

function calculateHeartRateZones() { var age = parseFloat(document.getElementById("age").value); var maxHeartRateInput = parseFloat(document.getElementById("maxHeartRate").value); var resultsDiv = document.getElementById("results"); // Clear previous results resultsDiv.innerHTML = ""; var maxHeartRate; // If max heart rate is not provided, estimate using age if (isNaN(maxHeartRateInput) && !isNaN(age)) { maxHeartRate = 220 – age; document.getElementById("maxHeartRate").value = maxHeartRate; // Update input field if estimated } else if (!isNaN(maxHeartRateInput)) { maxHeartRate = maxHeartRateInput; } else { resultsDiv.innerHTML = "Please enter your age or estimated maximum heart rate."; return; } if (maxHeartRate <= 0) { resultsDiv.innerHTML = "Maximum heart rate must be a positive number."; return; } var zone1_min = maxHeartRate * 0.50; var zone1_max = maxHeartRate * 0.60; var zone2_min = maxHeartRate * 0.60; var zone2_max = maxHeartRate * 0.70; var zone3_min = maxHeartRate * 0.70; var zone3_max = maxHeartRate * 0.80; var zone4_min = maxHeartRate * 0.80; var zone4_max = maxHeartRate * 0.90; var zone5_min = maxHeartRate * 0.90; var zone5_max = maxHeartRate * 1.00; resultsDiv.innerHTML += "
Zone 1 (50-60%): " + Math.round(zone1_min) + " – " + Math.round(zone1_max) + " bpm
"; resultsDiv.innerHTML += "
Zone 2 (60-70%): " + Math.round(zone2_min) + " – " + Math.round(zone2_max) + " bpm
"; resultsDiv.innerHTML += "
Zone 3 (70-80%): " + Math.round(zone3_min) + " – " + Math.round(zone3_max) + " bpm
"; resultsDiv.innerHTML += "
Zone 4 (80-90%): " + Math.round(zone4_min) + " – " + Math.round(zone4_max) + " bpm
"; resultsDiv.innerHTML += "
Zone 5 (90-100%): " + Math.round(zone5_min) + " – " + Math.round(zone5_max) + " bpm
"; } .heart-rate-zones-calculator { font-family: sans-serif; border: 1px solid #ccc; padding: 20px; border-radius: 8px; max-width: 600px; margin: 20px auto; background-color: #f9f9f9; } .heart-rate-zones-calculator h2, .heart-rate-zones-calculator h3, .heart-rate-zones-calculator h4 { text-align: center; color: #333; } .calculator-inputs { margin-bottom: 20px; display: flex; flex-direction: column; align-items: center; gap: 15px; } .form-group { display: flex; flex-direction: column; align-items: flex-start; width: 100%; max-width: 300px; } .form-group label { margin-bottom: 5px; font-weight: bold; color: #555; } .form-group input[type="number"] { width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; /* Include padding and border in the element's total width and height */ } .form-group small { display: block; margin-top: 5px; font-size: 0.8em; color: #777; } .heart-rate-zones-calculator button { padding: 10px 20px; background-color: #007bff; color: white; border: none; border-radius: 4px; cursor: pointer; font-size: 1em; transition: background-color 0.3s ease; } .heart-rate-zones-calculator button:hover { background-color: #0056b3; } .calculator-results { margin-top: 25px; padding: 15px; border: 1px solid #ddd; border-radius: 4px; background-color: #fff; text-align: center; } .calculator-results div { margin-bottom: 10px; font-size: 1.1em; } .calculator-explanation { margin-top: 30px; padding-top: 20px; border-top: 1px solid #eee; font-size: 0.95em; line-height: 1.5; color: #444; } .calculator-explanation ul { list-style: disc; margin-left: 20px; margin-top: 10px; } .calculator-explanation li { margin-bottom: 8px; }

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