The number of calories your body burns during physical activity is influenced by several factors, including your body weight, the intensity and duration of the activity, and your individual metabolism. This calculator provides an estimate of calories burned based on common activity types and your input.
How it Works: MET Values
This calculator uses the concept of Metabolic Equivalents of Task (METs). A MET is a measure of the energy expenditure of a physical activity compared to resting metabolic rate. A MET value of 1 represents the energy expenditure of sitting quietly. Activities with higher MET values burn more calories.
Walking (moderate pace): Typically around 3.5 METs
Running (moderate pace): Typically around 10 METs
Cycling (moderate pace): Typically around 8 METs
Swimming (moderate pace): Typically around 7 METs
Weightlifting (general): Typically around 3 METs
Yoga: Typically around 2.5 METs
Jumping Jacks: Typically around 10 METs
The formula used to estimate calories burned is:
Calories Burned = (MET value * 3.5 * Body Weight in kg) / 200 * Duration in minutes
This formula approximates the oxygen consumption and subsequent calorie expenditure.
Factors Affecting Calorie Burn:
Body Weight: Heavier individuals generally burn more calories performing the same activity.
Duration: The longer you engage in an activity, the more calories you burn.
Individual Metabolism: Age, sex, muscle mass, and genetics play a role in your basal metabolic rate and how efficiently you burn calories.
Environmental Factors: Temperature, altitude, and terrain can also influence energy expenditure.
Disclaimer:
This calculator provides an estimate for educational and informational purposes only. It is not a substitute for professional medical advice. For personalized fitness and nutrition plans, consult with a qualified healthcare provider or a certified personal trainer.
function calculateCalories() {
var weight = parseFloat(document.getElementById("weight").value);
var duration = parseFloat(document.getElementById("duration").value);
var activityType = document.getElementById("activityType").value;
var resultDiv = document.getElementById("result");
var metValues = {
"walking": 3.5,
"running": 10.0,
"cycling": 8.0,
"swimming": 7.0,
"weightlifting": 3.0,
"yoga": 2.5,
"jumping_jacks": 10.0
};
if (isNaN(weight) || isNaN(duration) || activityType === "") {
resultDiv.innerHTML = "Please enter valid values for all fields.";
return;
}
if (weight <= 0 || duration <= 0) {
resultDiv.innerHTML = "Weight and duration must be positive values.";
return;
}
var met = metValues[activityType];
if (met === undefined) {
resultDiv.innerHTML = "Please select a valid activity.";
return;
}
// Formula: (MET * 3.5 * Weight in kg) / 200 * Duration in minutes
var caloriesBurned = (met * 3.5 * weight) / 200 * duration;
// Display the result, rounded to 2 decimal places
resultDiv.innerHTML = "Calories Burned: " + caloriesBurned.toFixed(2) + " kcal";
}