Understanding how many calories you burn during exercise is a great way to monitor your fitness progress and ensure you're meeting your energy expenditure goals. While many factors influence calorie burn, your heart rate is a significant indicator of exercise intensity and, consequently, how many calories you're consuming. This calculator uses your heart rate, duration, and a few personal metrics to estimate your calorie expenditure.
Male
Female
function calculateCalorieBurn() {
var age = parseFloat(document.getElementById("age").value);
var weightKg = parseFloat(document.getElementById("weightKg").value);
var heartRate = parseFloat(document.getElementById("heartRate").value);
var durationMinutes = parseFloat(document.getElementById("durationMinutes").value);
var gender = document.getElementById("gender").value;
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
if (isNaN(age) || isNaN(weightKg) || isNaN(heartRate) || isNaN(durationMinutes) || age <= 0 || weightKg <= 0 || heartRate <= 0 || durationMinutes <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for all fields.";
return;
}
// Simplified MET (Metabolic Equivalent of Task) estimation based on heart rate
// This is a very basic estimation. More complex formulas exist.
var met;
if (heartRate = 100 && heartRate = 120 && heartRate < 140) {
met = 8.0; // Vigorous activity
} else {
met = 10.0; // Very vigorous activity
}
// Calorie burn formula (simplified: kcal/min = MET * 3.5 * weight_kg / 200)
// Adjusted for gender with a common multiplier (though this is also a simplification)
var calorieBurnPerMinute;
if (gender === "male") {
calorieBurnPerMinute = (met * 3.5 * weightKg / 200) * 1.1; // Slightly higher for males
} else {
calorieBurnPerMinute = met * 3.5 * weightKg / 200;
}
var totalCaloriesBurned = calorieBurnPerMinute * durationMinutes;
resultDiv.innerHTML = "Estimated Calories Burned: " + totalCaloriesBurned.toFixed(2) + " kcal";
}
#calorieBurnCalculator {
font-family: sans-serif;
max-width: 500px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ddd;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
}
.form-group input[type="number"],
.form-group select {
width: calc(100% – 12px);
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
button {
background-color: #4CAF50;
color: white;
padding: 10px 15px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
width: 100%;
}
button:hover {
background-color: #45a049;
}
#result {
margin-top: 20px;
padding: 10px;
background-color: #f9f9f9;
border: 1px solid #eee;
border-radius: 4px;
text-align: center;
}