70 of Max Heart Rate Calculator

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70% of Maximum Heart Rate Calculator

Understanding your heart rate zones is crucial for effective and safe exercise. The Karvonen formula is a popular method for calculating target heart rates, but a simpler approach involves identifying a percentage of your maximum heart rate (MHR). This calculator helps you easily determine your target heart rate at 70% of your MHR, which is often considered a moderate-intensity zone suitable for aerobic conditioning and fat burning.

Your maximum heart rate is the highest number of times your heart can beat in one minute during intense physical activity. While there are several ways to estimate MHR, the most common formula is 220 minus your age. Once you have your estimated MHR, you can easily calculate your target heart rate at 70%.

How to use this calculator:

  1. Enter your age in the field below.
  2. Click "Calculate".
  3. The calculator will display your estimated maximum heart rate and your target heart rate at 70% of that value.
function calculate70PercentMHR() { var ageInput = document.getElementById("age"); var resultDiv = document.getElementById("result"); // Clear previous results resultDiv.innerHTML = ""; var age = parseFloat(ageInput.value); if (isNaN(age) || age <= 0) { resultDiv.innerHTML = "Please enter a valid age."; return; } // Estimate Maximum Heart Rate (MHR) var maxHeartRate = 220 – age; // Calculate 70% of MHR var targetHeartRate70 = maxHeartRate * 0.70; // Display the results resultDiv.innerHTML = "Estimated Maximum Heart Rate: " + maxHeartRate.toFixed(0) + " bpm" + "Target Heart Rate (70% of MHR): " + targetHeartRate70.toFixed(0) + " bpm"; } .calculator-container { border: 1px solid #ccc; padding: 20px; border-radius: 8px; max-width: 400px; margin: 20px auto; font-family: sans-serif; background-color: #f9f9f9; } .form-group { margin-bottom: 15px; } .form-group label { display: block; margin-bottom: 5px; font-weight: bold; } .form-group input { width: calc(100% – 10px); padding: 8px; border: 1px solid #ccc; border-radius: 4px; } button { background-color: #4CAF50; color: white; padding: 10px 15px; border: none; border-radius: 4px; cursor: pointer; font-size: 16px; display: block; width: 100%; margin-top: 10px; } button:hover { background-color: #45a049; } #result { margin-top: 20px; border-top: 1px solid #eee; padding-top: 15px; } #result p { margin-bottom: 10px; line-height: 1.5; }

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