Your maximum heart rate (MHR) is a crucial metric for understanding your exercise intensity zones. A common formula to estimate MHR is 220 minus your age. Once you have your estimated MHR, you can calculate specific training zones. This calculator helps you determine 85% of your estimated MHR, often considered a vigorous intensity zone suitable for improving aerobic capacity and endurance.
function calculate85MaxHeartRate() {
var age = document.getElementById("age").value;
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
// Input validation
if (isNaN(age) || age 120) {
resultDiv.innerHTML = "Please enter a valid age (between 1 and 120).";
return;
}
// Calculate estimated Maximum Heart Rate (MHR)
var estimatedMaxHeartRate = 220 – age;
// Calculate 85% of MHR
var eightyFivePercentMHR = estimatedMaxHeartRate * 0.85;
// Display the result
resultDiv.innerHTML =
"Your estimated Maximum Heart Rate (MHR): " + estimatedMaxHeartRate.toFixed(0) + " bpm" +
"85% of your Maximum Heart Rate: " + eightyFivePercentMHR.toFixed(0) + " bpm" +
"This heart rate is typically in the vigorous intensity zone, excellent for improving cardiovascular fitness.";
}
.heart-rate-calculator {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 400px;
margin: 20px auto;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.heart-rate-calculator h2 {
text-align: center;
margin-bottom: 15px;
color: #333;
}
.heart-rate-calculator p {
line-height: 1.6;
color: #555;
text-align: justify;
}
.input-section {
margin-bottom: 15px;
display: flex;
align-items: center;
gap: 10px;
}
.input-section label {
font-weight: bold;
color: #444;
flex-shrink: 0;
}
.input-section input[type="number"] {
padding: 8px;
border: 1px solid #ddd;
border-radius: 4px;
width: 100%;
box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
.heart-rate-calculator button {
background-color: #007bff;
color: white;
padding: 10px 15px;
border: none;
border-radius: 4px;
cursor: pointer;
width: 100%;
font-size: 16px;
transition: background-color 0.3s ease;
}
.heart-rate-calculator button:hover {
background-color: #0056b3;
}
.result-section {
margin-top: 20px;
padding: 15px;
background-color: #e9ecef;
border: 1px solid #ced4da;
border-radius: 4px;
text-align: center;
}
.result-section strong {
color: #007bff;
}