Calories Spent Calculator

kg lb

Sleeping Sitting quietly Walking (slow pace) Walking (brisk pace) Leisurely Cycling Weight Lifting (moderate) Jogging (moderate) Swimming (laps) Running (moderate) Running (fast pace) HIIT Training Running (sprint)

Total Calories Burned

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How Does the Calories Spent Calculator Work?

This calculator uses the Metabolic Equivalent of Task (MET) value to estimate the amount of energy your body uses during physical activity. The MET value is a ratio of your working metabolic rate relative to your resting metabolic rate. One MET is defined as the energy it takes to sit quietly.

The Science of Calculation

The standard formula used to determine the calories burned per activity is:

Calories = (MET × Body Weight in kg × Duration in minutes) ÷ 60

Realistic Examples

• Walking: A 70kg (154 lb) person walking briskly for 60 minutes (MET 3.5) burns approximately 245 calories.
• Running: A 80kg (176 lb) person running at a moderate pace for 30 minutes (MET 10) burns approximately 400 calories.
• Swimming: A 60kg (132 lb) person swimming laps for 45 minutes (MET 8) burns approximately 360 calories.

Factors That Influence Calorie Burn

While this calculator provides a highly accurate estimate based on standardized MET values, several individual factors can influence the actual number of calories you burn:

1. Body Composition: People with more muscle mass often burn more calories even at rest because muscle is more metabolically active than fat.
2. Age: Metabolism naturally slows down as we age due to changes in hormonal levels and muscle mass.
3. Intensity: The harder you push yourself, the higher the actual MET value for that specific session.
4. Environmental Conditions: Exercising in extreme heat or cold can increase calorie expenditure as the body works harder to maintain its core temperature.

function calculateCalories() { var weight = parseFloat(document.getElementById('userWeight').value); var unit = document.getElementById('weightUnit').value; var duration = parseFloat(document.getElementById('activityDuration').value); var metValue = parseFloat(document.getElementById('activityType').value); var resultBox = document.getElementById('calorieResultBox'); var resultDisplay = document.getElementById('totalCalories'); var descDisplay = document.getElementById('calorieDescription'); if (isNaN(weight) || weight <= 0) { alert("Please enter a valid weight."); return; } if (isNaN(duration) || duration <= 0) { alert("Please enter a valid duration."); return; } // Convert weight to kg if it is in lb var weightInKg = weight; if (unit === 'lb') { weightInKg = weight * 0.453592; } // Calculation Formula: (MET * weightInKg * duration) / 60 var caloriesBurned = (metValue * weightInKg * duration) / 60; var finalResult = Math.round(caloriesBurned); resultDisplay.innerHTML = finalResult + " kcal"; // Generate description var activityName = document.getElementById('activityType').options[document.getElementById('activityType').selectedIndex].text; descDisplay.innerHTML = "Estimated energy spent during " + duration + " minutes of " + activityName.toLowerCase() + "."; resultBox.style.display = 'block'; resultBox.scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }