Your Estimated Calories Burned:
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Note: This is an estimate. Actual calories burned can vary based on individual metabolism, fitness level, and exercise intensity.
.calculator-container {
font-family: Arial, sans-serif;
max-width: 600px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ddd;
border-radius: 8px;
background-color: #f9f9f9;
}
.calculator-form h2 {
text-align: center;
color: #333;
margin-bottom: 20px;
}
.calculator-form p {
color: #555;
line-height: 1.6;
margin-bottom: 25px;
}
.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #444;
}
.form-group input[type="number"],
.form-group select {
width: calc(100% – 22px);
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
.form-group button {
background-color: #4CAF50;
color: white;
padding: 12px 20px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
width: 100%;
margin-top: 10px;
}
.form-group button:hover {
background-color: #45a049;
}
.calculator-result {
margin-top: 30px;
padding: 20px;
border: 1px solid #eee;
border-radius: 8px;
background-color: #fff;
text-align: center;
}
.calculator-result h3 {
color: #333;
margin-bottom: 15px;
}
#caloriesOutput {
font-size: 24px;
font-weight: bold;
color: #4CAF50;
margin-bottom: 10px;
}
.calculator-result p strong {
color: #333;
}
function calculateCalories() {
var weightKg = parseFloat(document.getElementById("weightKg").value);
var age = parseInt(document.getElementById("age").value);
var heartRate = parseInt(document.getElementById("heartRate").value);
var durationMinutes = parseInt(document.getElementById("durationMinutes").value);
var gender = document.getElementById("gender").value;
if (isNaN(weightKg) || isNaN(age) || isNaN(heartRate) || isNaN(durationMinutes) || weightKg <= 0 || age <= 0 || heartRate <= 0 || durationMinutes <= 0) {
document.getElementById("caloriesOutput").innerHTML = "Please enter valid positive numbers for all fields.";
return;
}
// Approximate BMR (Basal Metabolic Rate) using Harris-Benedict Equation
var bmr;
if (gender === "male") {
bmr = (10 * weightKg) + (6.25 * 70) – (5 * age) + 5; // Using a fixed height of 70 for simplicity as it's not an input
} else { // female
bmr = (10 * weightKg) + (6.25 * 70) – (5 * age) – 161; // Using a fixed height of 70 for simplicity
}
// Estimate MET value based on Heart Rate
// These are general estimations and can vary significantly.
// A more complex model would be needed for precise MET calculation.
var met;
if (heartRate < 100) {
met = 3.5; // Light activity
} else if (heartRate < 120) {
met = 5.0; // Moderate activity
} else if (heartRate < 140) {
met = 7.0; // Vigorous activity
} else if (heartRate < 160) {
met = 9.0; // Very vigorous activity
} else {
met = 11.0; // Extremely vigorous activity
}
// Calories burned per minute using MET formula:
// Calories/min = (MET * 3.5 * weightKg) / 200
var caloriesPerMinute = (met * 3.5 * weightKg) / 200;
var totalCaloriesBurned = caloriesPerMinute * durationMinutes;
document.getElementById("caloriesOutput").innerHTML = totalCaloriesBurned.toFixed(2) + " kcal";
}