Free Online Calories Burned Calculator
Find out exactly how many calories you burn during any workout using scientifically validated MET (Metabolic Equivalent of Task) values. Our accurate free online calories burned calculator supports both US Imperial units and UK/EU Metric units to help you align your training with guidelines set by the WHO, CDC, and NHS.
Your Calories Burned
Calorie Equivalents
Free Online Calories Burned Calculator – Estimate Your Workout Energy
The calories burned calculator uses MET values (Metabolic Equivalents of Task), a standardized measurement system developed by exercise scientists to quantify the energy cost of physical activities relative to your resting metabolic rate. Whether you track weight in US Imperial units (pounds) or UK/EU Metric units (kilograms), our accurate free online calories burned calculator provides clear, scientifically backed energy estimates.
To maintain robust health and prevent metabolic diseases, regional and global health authorities like the World Health Organization (WHO), the CDC, and the NHS recommend achieving at least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity aerobic physical activity weekly. Computing your exercise energy cost is a great way to monitor whether your sessions are active enough to satisfy these health guidelines.
Example: Running at 10 km/h (MET 10), 70 kg person, 30 minutes:
= 10 × 70 × 0.5 = 350 kcal
One MET equals the energy expended sitting quietly, approximately 1 kcal per kg per hour. So an activity with a MET of 8 burns 8 times more energy than sitting at rest. This formula is used in research and clinical settings worldwide, published in the Compendium of Physical Activities by Ainsworth et al.
Because the formula directly incorporates body weight, heavier individuals burn more calories performing the same activity for the same duration. A 90 kg person jogging for 30 minutes burns roughly 29% more calories than a 70 kg person doing the same workout.
What are MET Values?
A Metabolic Equivalent of Task (MET) is the ratio of a person's working metabolic rate relative to their resting metabolic rate. One MET is defined as 1 kcal/kg/hour, which is roughly the energy you expend while sitting quietly.
MET Classification
- Light intensity (1.5–3 METs): Yoga, slow walking, light housework
- Moderate intensity (3–6 METs): Brisk walking, leisurely cycling, dancing
- Vigorous intensity (6+ METs): Running, swimming laps, HIIT, jump rope
MET values are derived from large-scale laboratory studies measuring oxygen consumption during exercise. The Compendium of Physical Activities — the definitive reference — lists MET values for over 800 activities. Our calculator uses these published, peer-reviewed values.
Limitations to Keep in Mind
MET-based estimates assume average fitness levels and don't account for individual differences in efficiency, altitude, temperature, or terrain. Actual calories burned can vary ±15–20% from these estimates. For the most accurate results, use a heart rate monitor or metabolic testing.
MET Values Reference Table — Top Activities by Calorie Burn
Activities ranked from highest to lowest MET value. Calories shown for a 70 kg person exercising for 30 minutes.
| Activity | MET Value | Kcal / 30 min (70 kg) | Intensity |
|---|---|---|---|
| Jump Rope | 11.8 | 413 | Vigorous |
| Running (12 km/h) | 11.5 | 403 | Vigorous |
| Running (10 km/h) | 10.0 | 350 | Vigorous |
| HIIT | 10.0 | 350 | Vigorous |
| Swimming (vigorous) | 10.0 | 350 | Vigorous |
| Cycling (vigorous) | 12.0 | 420 | Vigorous |
| Rock Climbing | 8.0 | 280 | Vigorous |
| Running (8 km/h) | 8.0 | 280 | Vigorous |
| Boxing (sparring) | 7.8 | 273 | Vigorous |
| Rowing (moderate) | 7.0 | 245 | Vigorous |
| Soccer | 7.0 | 245 | Vigorous |
| Tennis | 7.3 | 256 | Vigorous |
| Weight Lifting (vigorous) | 6.0 | 210 | Vigorous |
| Swimming (leisure) | 6.0 | 210 | Moderate |
| Hiking | 6.0 | 210 | Moderate |
Frequently Asked Questions
Are calories burned calculators accurate?
While our tool uses standard MET values which are highly validated in clinical trials, any calories burned calculator provides an estimate rather than a direct measurement. Individual variations in muscle mass, genetics, metabolic efficiency, and environmental factors like elevation can affect actual expenditure by 10% to 20%. For optimal tracking, use this tool alongside a reliable fitness heart rate monitor.
How do I switch between US Imperial units and UK/EU Metric units on this calories burned calculator?
The core MET equation operates on metric kilograms. However, our free online calories burned calculator is fully optimized for US Imperial units. If you know your weight in pounds (lbs), simply divide it by 2.2046 to obtain your weight in kilograms (kg) before inputting. The final calorie and fat mass burned outputs are compatible with both measurement standards.
How many calories do I need to burn to lose weight under CDC guidelines?
According to CDC guidelines, a healthy weight loss target is 1 to 2 pounds (approx. 0.5 to 1 kg) per week, which requires a daily energy deficit of 500 to 1,000 calories. You can achieve this deficit by burning calories through moderate-to-vigorous exercise and reducing your daily calorie intake. Do not drop your intake below your BMR without medical supervision.
What exercises burn the most calories according to WHO classifications?
Under WHO physical activity classifications, vigorous-intensity activities burn the most energy per minute. High-MET exercises like running, bicycling at speeds over 22 km/h (14 mph), continuous jump rope, and competitive swimming require the most oxygen consumption, typically burning 300 to 450 calories per 30 minutes for an average adult.