Calories Burned Calculator

What Are MET Values?

A MET (Metabolic Equivalent of Task) is a unit that expresses the energy cost of a physical activity relative to your resting metabolic rate. One MET is defined as the energy expenditure at rest, which is approximately 3.5 milliliters of oxygen consumed per kilogram of body weight per minute, or roughly 1 calorie per kilogram of body weight per hour.

When an activity has a MET value of 8, it means you are burning energy at eight times the rate you would while sitting still. This standardized system allows researchers and fitness professionals to compare the intensity of vastly different activities on a common scale. The Compendium of Physical Activities, maintained by Arizona State University, catalogues MET values for over 800 specific activities based on published research.

How Calories Burned Are Calculated

The formula used by this calculator is straightforward and well-established in exercise science:

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

For example, a 70 kg person running at a MET of 9.8 for 30 minutes would burn: 9.8 x 70 x 0.5 = 343 calories. This formula provides a reasonable estimate for most individuals, though actual calorie expenditure can vary based on fitness level, body composition, environmental conditions, and exercise technique.

MET Values for Common Activities

The following table lists MET values for popular exercises and everyday activities, based on the 2024 Compendium of Physical Activities:

Exercise Intensity Zones

MET values provide a convenient way to classify exercise intensity, which is important for designing effective training programs and meeting physical activity guidelines:

• Light intensity (1.5 - 3.0 METs): Activities like slow walking, stretching, and casual household tasks. You can carry on a normal conversation easily. Light activity is a good starting point for sedentary individuals and contributes to daily NEAT.
• Moderate intensity (3.0 - 6.0 METs): Brisk walking, recreational cycling, water aerobics, and general weightlifting. You can talk but not sing. The World Health Organization recommends at least 150 minutes of moderate-intensity activity per week for health maintenance.
• Vigorous intensity (6.0 - 9.0 METs): Jogging, swimming laps, competitive sports, and circuit training. Conversation becomes difficult. Vigorous activity counts double toward WHO guidelines, so 75 minutes per week provides equivalent health benefits to 150 minutes of moderate activity.
• Very vigorous intensity (9.0+ METs): Sprinting, high-intensity interval training (HIIT), competitive rowing, and fast-paced running. These activities cannot be sustained for long periods and provide maximum cardiovascular training stimulus.

Factors That Affect Calorie Burn

The MET formula provides an estimate, but several factors cause real-world calorie burn to deviate from calculated values:

• Body weight: Heavier individuals burn more total calories performing the same activity because moving a larger body requires more energy. This is already accounted for in the formula.
• Fitness level: As you become fitter, your body becomes more efficient at performing familiar movements. A trained runner burns fewer calories per mile than a beginner at the same pace because their movement economy improves. This effect can reduce actual calorie burn by 10-20% compared to published MET values.
• Body composition: Muscle tissue is more metabolically active than fat tissue. Two people at the same weight but different body fat percentages will burn slightly different amounts of calories during the same activity.
• Environmental conditions: Exercising in heat, cold, or at altitude increases energy expenditure because your body works harder to regulate temperature and oxygen delivery.
• EPOC (Afterburn effect): High-intensity and resistance exercises create an "afterburn" effect where your metabolic rate stays elevated for hours after exercise. This Excess Post-Exercise Oxygen Consumption (EPOC) is not captured in MET values but can add 6-15% to total calorie burn from a vigorous session.

Calories Burned and Weight Loss

A common rule of thumb states that burning 7,700 calories (approximately 3,500 per pound) results in one kilogram of fat loss. However, this is a simplification. In practice, the relationship between exercise calories and fat loss is non-linear because your body adapts to increased activity through changes in appetite hormones, non-exercise movement (NEAT), and metabolic rate.

Exercise alone, without dietary changes, typically produces modest weight loss of 1-3 kg over several months. The real power of exercise for weight management lies in preserving muscle mass during a calorie deficit, improving insulin sensitivity, and supporting long-term weight maintenance after fat loss. For the most effective fat loss strategy, combine regular exercise with a moderate calorie deficit calculated from your TDEE.

Meeting Physical Activity Guidelines

The World Health Organization recommends that adults perform at least 150-300 minutes of moderate-intensity aerobic activity (3-6 METs) or 75-150 minutes of vigorous-intensity activity (6+ METs) per week. Additional health benefits are obtained by exceeding these minimums. Muscle-strengthening activities involving all major muscle groups should be performed at least two days per week.