Calories Burned Calculator

The Science of Burning Calories: Understanding METs

Whether you are training for a marathon, lifting weights, or simply cleaning your house, your body is constantly burning energy. Understanding exactly how many calories you burn is a powerful tool for weight management and fitness tracking. This Calories Burned Calculator uses the scientific standard known as the Metabolic Equivalent of Task (MET) to provide accurate estimates for hundreds of different activities.

What is a MET?

MET stands for Metabolic Equivalent of Task. It is a ratio that compares the energy expenditure of a specific activity to the energy expenditure of sitting quietly (resting).

• 1 MET = The rate of energy you burn while sitting at rest (roughly 1 calorie per kilogram of body weight per hour).
• 3 METs = An activity that requires 3 times the energy of sitting still (e.g., walking at a moderate pace).
• 10 METs = A vigorous activity requiring 10 times the resting energy (e.g., running at 6 mph).

The Calculation Formula

The standard formula used by exercise physiologists and this calculator to estimate calories burned is:

This formula highlights a key fact: heavier people burn more calories doing the same activity than lighter people. This is because it takes more energy to move a larger mass against gravity.

Factors That Influence Calorie Burn

While the MET formula provides a standardized estimate, individual results can vary based on several factors:

1. Body Composition: Muscle tissue burns more calories than fat tissue, even at rest. A person with high muscle mass (calculate yours with our Lean Body Mass Calculator) will likely burn slightly more calories than the standard formula predicts.
2. Intensity: Two people might both be "swimming," but one might be leisurely treading water while the other is racing. MET values represent averages; higher intensity equals higher burn.
3. Age: As we age, our metabolism generally slows down, often due to a decrease in muscle mass.
4. Fitness Level: Paradoxically, as you get fitter, your body becomes more efficient. A professional runner burns fewer calories running a mile than a beginner because their body wastes less energy.

Using This Tool for Weight Loss

Weight loss is fundamentally a math equation: Calories In vs. Calories Out.

• Calories In: The food you eat. You can manage this using our Macro Calculator.
• Calories Out: Your total daily burn. This includes your BMR (what you burn existing) plus the active calories calculated by this tool.

To lose weight, you need a calorie deficit. By tracking your workouts here, you can see exactly how much "extra" room you've created in your daily calorie budget, or how much closer you are to that 3,500-calorie deficit needed to lose a pound of fat.