Heart Rate Zone Calculators

Understanding Your Heart Rate Zones

Your heart rate zones are ranges of your heart rate, expressed as a percentage of your maximum heart rate. Training within these zones helps you achieve different fitness goals, whether it's improving aerobic capacity, building endurance, or increasing speed. Understanding your zones allows for more targeted and effective workouts.

What is Maximum Heart Rate?

Your maximum heart rate (MHR) is the highest number of times your heart can realistically beat in one minute during intense physical activity. A common and simple formula to estimate MHR is 220 minus your age. For example, if you are 30 years old, your estimated MHR would be 220 – 30 = 190 beats per minute (bpm).

The Five Heart Rate Zones

Most fitness professionals use five heart rate zones, each corresponding to a different intensity level and offering distinct benefits:

  • Zone 1 (Very Light): 50-60% of MHR. This is a recovery pace, good for active recovery and warming up/cooling down.
  • Zone 2 (Light): 60-70% of MHR. This is your aerobic base-building zone. You can hold a conversation comfortably.
  • Zone 3 (Moderate): 70-80% of MHR. This is the "tempo" zone, where your aerobic fitness improves. You can speak in shorter sentences.
  • Zone 4 (Hard): 80-90% of MHR. This zone improves your anaerobic threshold and power. Speaking becomes difficult.
  • Zone 5 (Maximum): 90-100% of MHR. This is for short bursts of maximum effort. You can only speak a word or two.

By calculating your specific heart rate zones, you can tailor your training to maximize your progress and enjoyment.

Heart Rate Zone Calculator

Your Heart Rate Zones:

Zone 1 (Very Light):

Zone 2 (Light):

Zone 3 (Moderate):

Zone 4 (Hard):

Zone 5 (Maximum):

function calculateHeartRateZones() { var ageInput = document.getElementById("age"); var maxHeartRateInput = document.getElementById("maxHeartRate"); var zone1Span = document.getElementById("zone1"); var zone2Span = document.getElementById("zone2"); var zone3Span = document.getElementById("zone3"); var zone4Span = document.getElementById("zone4"); var zone5Span = document.getElementById("zone5"); var age = parseFloat(ageInput.value); if (isNaN(age) || age 120) { alert("Please enter a valid age between 1 and 120."); return; } // Calculate Estimated Maximum Heart Rate (MHR) var estimatedMHR = 220 – age; maxHeartRateInput.value = estimatedMHR + " bpm"; // Calculate Heart Rate Zones var zone1Lower = Math.round(estimatedMHR * 0.50); var zone1Upper = Math.round(estimatedMHR * 0.60); zone1Span.textContent = zone1Lower + " – " + zone1Upper + " bpm"; var zone2Lower = Math.round(estimatedMHR * 0.60); var zone2Upper = Math.round(estimatedMHR * 0.70); zone2Span.textContent = zone2Lower + " – " + zone2Upper + " bpm"; var zone3Lower = Math.round(estimatedMHR * 0.70); var zone3Upper = Math.round(estimatedMHR * 0.80); zone3Span.textContent = zone3Lower + " – " + zone3Upper + " bpm"; var zone4Lower = Math.round(estimatedMHR * 0.80); var zone4Upper = Math.round(estimatedMHR * 0.90); zone4Span.textContent = zone4Lower + " – " + zone4Upper + " bpm"; var zone5Lower = Math.round(estimatedMHR * 0.90); var zone5Upper = Math.round(estimatedMHR * 1.00); zone5Span.textContent = zone5Lower + " – " + zone5Upper + " bpm"; } .calculator-container { font-family: sans-serif; display: flex; flex-wrap: wrap; gap: 30px; margin: 20px auto; max-width: 900px; border: 1px solid #e0e0e0; padding: 25px; border-radius: 8px; background-color: #ffffff; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05); } .article-content { flex: 1; min-width: 300px; line-height: 1.6; color: #333; } .article-content h2, .article-content h3 { color: #0056b3; margin-bottom: 15px; } .article-content p { margin-bottom: 15px; } .article-content ul { margin-bottom: 15px; padding-left: 20px; } .article-content li { margin-bottom: 8px; } .calculator-form { flex: 1; min-width: 300px; background-color: #f9f9f9; padding: 20px; border-radius: 5px; border: 1px solid #eee; } .calculator-form h3 { color: #0056b3; margin-top: 0; margin-bottom: 20px; text-align: center; } .input-group { margin-bottom: 15px; } .input-group label { display: block; margin-bottom: 5px; font-weight: bold; color: #555; } .input-group input[type="number"], .input-group input[type="text"] { width: calc(100% – 12px); padding: 8px 5px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; /* Include padding and border in the element's total width and height */ } .input-group input[readonly] { background-color: #e9e9e9; cursor: not-allowed; } button { display: block; width: 100%; padding: 10px 15px; background-color: #007bff; color: white; border: none; border-radius: 5px; font-size: 16px; cursor: pointer; transition: background-color 0.3s ease; margin-top: 20px; } button:hover { background-color: #0056b3; } #heartRateZones { margin-top: 20px; border-top: 1px solid #eee; padding-top: 15px; } #heartRateZones h4 { margin-top: 0; color: #333; margin-bottom: 15px; } .zone-display { margin-bottom: 10px; color: #444; } .zone-display p { margin: 0; font-size: 0.95em; } .zone-display span { font-weight: bold; color: #007bff; }

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