Your maximum heart rate is the highest number of times your heart can realistically beat per minute during intense physical activity. It's a crucial metric for understanding your target heart rate zones during exercise, which helps optimize training for fitness, endurance, or recovery. A common and widely used formula to estimate maximum heart rate is the Tanaka formula, which is generally considered more accurate than older methods for a broader age range.
function calculateMaxHeartRate() {
var age = document.getElementById("age").value;
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
// Validate input
if (isNaN(age) || age = 120) {
resultDiv.innerHTML = "Please enter a valid age (between 1 and 119 years).";
return;
}
// Tanaka formula: Max Heart Rate = 208 – (0.7 * Age)
var maxHeartRate = 208 – (0.7 * age);
resultDiv.innerHTML = "Based on your age of " + age + " years, your estimated maximum heart rate is: " + maxHeartRate.toFixed(2) + " bpm";
}
.heart-rate-calculator {
font-family: sans-serif;
border: 1px solid #ddd;
padding: 20px;
border-radius: 8px;
max-width: 400px;
margin: 20px auto;
background-color: #f9f9f9;
}
.heart-rate-calculator h2 {
text-align: center;
color: #333;
margin-bottom: 20px;
}
.heart-rate-calculator p {
line-height: 1.6;
color: #555;
}
.input-section {
margin-bottom: 15px;
display: flex;
align-items: center;
justify-content: space-between;
}
.input-section label {
font-weight: bold;
color: #444;
flex-basis: 40%;
}
.input-section input[type="number"] {
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
width: 60%;
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;
font-size: 1em;
width: 100%;
margin-top: 10px;
transition: background-color 0.3s ease;
}
.heart-rate-calculator button:hover {
background-color: #0056b3;
}
.result-section {
margin-top: 20px;
padding-top: 15px;
border-top: 1px solid #eee;
text-align: center;
color: #333;
}
.result-section p {
margin: 0;
font-size: 1.1em;
}
.result-section strong {
color: #007bff;
}