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Calories Burned Calculator

Estimate calories burned during any physical activity using MET values, body weight, and exercise duration.

Reviewed by Chase FloiedUpdated

This free online calories burned calculator provides instant results with no signup required. All calculations run directly in your browser — your data is never sent to a server. Enter your values below and see results update in real time as you type. Perfect for everyday calculations, homework, or professional use.

Metabolic Equivalent of Task. Walking = 3.5, Running = 9.8, Cycling = 7.5.

Your body weight in kilograms.

Exercise duration in hours. 30 min = 0.5.

Results

Calories Burned

490 kcal

How to Use This Calculator

1

Enter your input values

Fill in all required input fields for the Calories Burned Calculator. Most fields include unit selectors so you can work in your preferred unit system — metric or imperial, whichever matches your problem.

2

Review your inputs

Double-check that all values are correct and that you have selected the right units for each field. Incorrect units are the most common source of calculation errors and can produce results that are off by factors of 2, 10, or more.

3

Read the results

The Calories Burned Calculator instantly computes the output and displays results with units clearly labeled. All calculations happen in your browser — no loading time and no data sent to a server.

4

Explore parameter sensitivity

Try adjusting individual input values to see how the output changes. This is a quick and effective way to develop intuition about how different parameters influence the result and to identify which inputs have the largest effect.

Formula Reference

Calories Burned Calculator Formula

See calculator inputs for the governing equation

Variables: All variables and their units are labeled in the calculator interface above. Input fields accept values in multiple unit systems — select your preferred unit from the dropdown next to each field.

When to Use This Calculator

  • Use the Calories Burned Calculator when you need accurate results quickly without the risk of manual computation errors or unit conversion mistakes.
  • Use it to verify calculations made by hand or in spreadsheets — an independent check can catch errors before they lead to costly decisions.
  • Use it to explore how changing input parameters affects the output — a quick way to develop intuition and identify the most influential variables.
  • Use it when collaborating with others to ensure everyone is working from the same numbers and applying the same assumptions.

About This Calculator

The Calories Burned Calculator is a free, browser-based calculation tool for engineers, students, and technical professionals. Estimate calories burned during any physical activity using MET values, body weight, and exercise duration. It implements standard formulas and supports both metric (SI) and imperial unit systems with automatic unit conversion. All calculations are performed instantly in your browser with no data sent to a server. Use this calculator as a quick reference and sanity-check tool during design, analysis, and learning. Always verify results against primary engineering references and applicable standards for any safety-critical application.

About Calories Burned Calculator

Understanding how many calories you burn during exercise is fundamental to managing your weight, optimizing your training, and planning your nutrition. The Calories Burned Calculator uses the well-established MET (Metabolic Equivalent of Task) system developed by exercise physiologists to provide a science-based estimate of energy expenditure for virtually any physical activity. Whether you are walking the dog, lifting weights, or playing basketball, this tool translates effort into a calorie number you can use to guide dietary choices and fitness goals. Caloric expenditure varies widely between individuals because it depends on body mass, exercise intensity, and duration. A heavier person performing the same activity at the same intensity as a lighter person will burn more calories simply because more energy is needed to move a larger body. Similarly, high-intensity activities like sprinting carry MET values above 10, while gentle stretching sits around 2.5. By combining these three variables, the MET formula produces an estimate that, while not perfectly precise, is widely used in clinical and sports science literature.

The Math Behind It

The MET concept was introduced to standardize the measurement of physical activity intensity. One MET equals the rate of energy expenditure while sitting quietly, approximately 3.5 milliliters of oxygen consumed per kilogram of body weight per minute, or roughly 1 kcal per kilogram per hour. Activities are assigned MET values based on oxygen consumption measured in laboratory settings; these values are compiled in the Compendium of Physical Activities maintained by Arizona State University. To convert a MET value into total calories burned, you multiply the MET value by the person's weight in kilograms and by the duration in hours. This yields kilocalories because 1 MET-hour per kilogram approximates 1 kcal. The formula assumes a linear relationship between MET value and calorie expenditure, which is a simplification: in reality, factors such as fitness level, environmental temperature, altitude, and body composition influence the actual energy cost. Nonetheless, the MET system remains the gold standard for population-level energy expenditure estimation and is used by the American College of Sports Medicine, the World Health Organization, and most fitness tracking devices. Resting metabolic rate (RMR) also plays a role: the calories you burn during exercise include both the exercise-specific expenditure and your baseline metabolic cost. Some calculators subtract 1 MET to avoid double-counting resting metabolism, but the standard formula shown here includes both components, which is appropriate when comparing total energy cost of an activity versus resting.

Formula Reference

Calorie Burn Formula

Calories = MET x Weight(kg) x Duration(hours)

Variables: MET = Metabolic Equivalent of Task; Weight in kilograms; Duration in hours

Worked Examples

Example 1: Jogging for 45 minutes

A 75 kg person jogs at a MET value of 7.0 for 45 minutes (0.75 hours).

Step 1:Identify MET = 7.0, weight = 75 kg, duration = 0.75 hours
Step 2:Apply formula: 7.0 x 75 x 0.75
Step 3:Calculate: 7.0 x 75 = 525; 525 x 0.75 = 393.75

The person burns approximately 394 kcal during the jog.

Example 2: Brisk walking for one hour

A 60 kg person walks briskly (MET 3.9) for 60 minutes (1 hour).

Step 1:MET = 3.9, weight = 60 kg, duration = 1.0 hour
Step 2:3.9 x 60 x 1.0 = 234

Approximately 234 kcal burned.

Common Mistakes & Tips

  • !Using minutes instead of hours for the duration input, which produces a result 60 times too large.
  • !Entering weight in pounds instead of kilograms; divide pounds by 2.205 to convert.
  • !Choosing a MET value that does not match the actual exercise intensity; always verify against the Compendium of Physical Activities.
  • !Assuming calories burned equals fat burned; fat loss also depends on diet and overall energy balance.

Related Concepts

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Frequently Asked Questions

What is a MET value?

A MET (Metabolic Equivalent of Task) represents the energy cost of an activity relative to sitting quietly. Sitting has a MET of 1.0, walking is about 3.5, and vigorous running can exceed 10.

Does this account for afterburn (EPOC)?

No. This formula estimates calories during the activity only. Excess Post-Exercise Oxygen Consumption (EPOC) adds additional calories after high-intensity exercise but is not included here.

How accurate is the MET method?

The MET method provides a reasonable estimate for most people but can be off by 10-20 percent due to individual differences in fitness, body composition, and environmental conditions.