This calculator estimates the calories burned during an exercise session based on your heart rate, duration, and personal factors. While heart rate is a good indicator of exercise intensity, remember that this is an estimation and individual results may vary.
Male
Female
function calculateCalories() {
var age = parseFloat(document.getElementById("age").value);
var weight = parseFloat(document.getElementById("weight").value);
var gender = document.getElementById("gender").value;
var averageHeartRate = parseFloat(document.getElementById("averageHeartRate").value);
var exerciseDuration = parseFloat(document.getElementById("exerciseDuration").value);
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
if (isNaN(age) || isNaN(weight) || isNaN(averageHeartRate) || isNaN(exerciseDuration) || age <= 0 || weight <= 0 || averageHeartRate <= 0 || exerciseDuration <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for all fields.";
return;
}
// Mifflin-St Jeor Equation for BMR (Basal Metabolic Rate)
var bmr;
if (gender === "male") {
bmr = (10 * weight) + (6.25 * 75) – (5 * age) + 5; // Using a placeholder height of 75cm for calculation, as it's not an input
} else {
bmr = (10 * weight) + (6.25 * 75) – (5 * age) – 161; // Using a placeholder height of 75cm for calculation
}
// MET (Metabolic Equivalent of Task) approximation based on heart rate
// This is a simplified approximation. More complex formulas exist.
// METs are roughly proportional to heart rate relative to resting heart rate (approx 60 bpm for estimation)
var restingHeartRate = 60; // Assumed resting heart rate
var intensityFactor = (averageHeartRate – restingHeartRate) / restingHeartRate;
var mets = 4 + (intensityFactor * 4); // Rough estimation: moderate exercise (4 METs) to vigorous (8 METs)
// Calories burned per minute = (METs * 3.5 * weight_kg) / 200
var caloriesPerMinute = (mets * 3.5 * weight) / 200;
var totalCaloriesBurned = caloriesPerMinute * exerciseDuration;
resultDiv.innerHTML = "Estimated Calories Burned: " + totalCaloriesBurned.toFixed(2) + " kcal";
}
#calorie-calculator {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 500px;
margin: 20px auto;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
#calorie-calculator h2 {
text-align: center;
margin-bottom: 20px;
color: #333;
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #555;
}
.input-group input[type="number"],
.input-group select {
width: calc(100% – 12px);
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
#calorie-calculator button {
display: block;
width: 100%;
padding: 12px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.3s ease;
}
#calorie-calculator button:hover {
background-color: #0056b3;
}
#result {
margin-top: 20px;
text-align: center;
font-size: 1.1em;
color: #333;
}