Maximum Exercise Heart Rate Calculator
Understanding your maximum heart rate (MHR) is a fundamental aspect of designing an effective and safe exercise program. It represents the highest number of times your heart can beat per minute during strenuous physical activity. A common and widely accepted formula for estimating MHR is the Tanaka formula: MHR = 208 – (0.7 x Age). This calculator will help you quickly determine your estimated MHR.
Your Age:
Calculate Maximum Heart Rate
Your Estimated Maximum Heart Rate:
function calculateMaxHeartRate() {
var ageInput = document.getElementById("age");
var resultDisplay = document.getElementById("result");
var age = parseFloat(ageInput.value);
if (isNaN(age) || age <= 0) {
resultDisplay.innerHTML = "Please enter a valid age.";
return;
}
// Tanaka formula for estimating Maximum Heart Rate
var maxHeartRate = 208 – (0.7 * age);
resultDisplay.innerHTML = maxHeartRate.toFixed(0) + " beats per minute (bpm)";
}
#max-hr-calculator {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 400px;
margin: 20px auto;
background-color: #f9f9f9;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
#calculator-title {
text-align: center;
color: #333;
margin-bottom: 15px;
}
#calculator-description {
font-size: 0.9em;
color: #555;
line-height: 1.5;
margin-bottom: 20px;
text-align: justify;
}
#input-section {
margin-bottom: 20px;
display: flex;
flex-direction: column;
align-items: center;
}
#input-section label {
display: block;
margin-bottom: 8px;
font-weight: bold;
color: #444;
}
#input-section input[type="number"] {
width: 80%;
padding: 10px;
margin-bottom: 15px;
border: 1px solid #ddd;
border-radius: 4px;
box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
#input-section button {
padding: 10px 20px;
background-color: #4CAF50;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 1em;
transition: background-color 0.3s ease;
}
#input-section button:hover {
background-color: #45a049;
}
#result-section {
text-align: center;
margin-top: 20px;
padding-top: 20px;
border-top: 1px solid #eee;
}
#result-section h3 {
color: #333;
margin-bottom: 10px;
}
#result {
font-size: 1.5em;
font-weight: bold;
color: #4CAF50;
}