Calories Burned Calculator

The calories burned calculator estimates how much energy your body uses during exercise and everyday physical activities. Whether you are running, walking, cycling, swimming, lifting weights, or doing housework, this calorie calculator translates your body weight, workout duration, and exercise intensity into an estimate of calories burned (measured in kilocalories, or kcal). It is one of the most popular tools for anyone tracking a fitness routine, managing a calorie deficit for weight loss, or simply curious about how much a workout "counts."

At the heart of the tool is the MET system — short for Metabolic Equivalent of Task. A MET represents the ratio of your working metabolic rate to your resting metabolic rate. Sitting quietly is defined as roughly 1 MET, brisk walking is about 3.5 METs, and vigorous running can reach 11 METs or more. By selecting an activity from the dropdown, you load a research-derived MET value; you can also override it with your own custom MET value if you have a more specific figure from a metabolic chart or wearable device.

Beyond the headline result, the calculator breaks calories down by duration (15, 30, 45, 60, 90, and 120 minutes), ranks the most calorie-intensive activities for your weight, and projects a rough monthly weight-loss estimate based on five sessions per week. This makes it useful not just for a single workout but for planning a sustainable training schedule around your goals.

The calculator uses the standard MET-based energy expenditure equation that is widely taught in exercise physiology and used by the Compendium of Physical Activities. The formula multiplies the activity's MET value by your body mass in kilograms and the time spent exercising in hours:

Because durations are entered in minutes, the tool first converts time to hours by dividing by 60. If your weight is entered in pounds, it is converted to kilograms by multiplying by 0.453592 before the calorie equation runs. A custom MET value, when provided, always takes priority over the activity's default MET.

For example, a 70 kg person running at a moderate pace (MET 9.8) for 30 minutes burns 9.8 × 70 × (30 ÷ 60) = 343 kcal. The tool also computes calories per minute by dividing total calories by the duration, giving a quick intensity snapshot you can compare across workouts.

MET values let you compare the relative intensity of completely different activities on a single scale. The higher the MET, the more energy the activity demands per kilogram of body weight per hour. Below are representative MET values used by this calorie calculator, drawn from established physical-activity references:

Activities below 3 METs are considered light intensity, those between 3 and 6 METs are moderate, and anything above 6 METs is classified as vigorous. Public-health guidelines recommend at least 150 minutes of moderate activity or 75 minutes of vigorous activity each week, and this calorie burned calculator helps you see how individual sessions add up toward those targets.

One reason people search for a calories burned calculator is to understand the relationship between exercise and fat loss. This tool includes a projection based on the classic rule that roughly 3,500 calories equals about one pound of body fat. It assumes a routine of five workout sessions per week at the same activity and duration you entered.

The calculation first finds your weekly calorie burn (single-session calories × 5), then multiplies by four weeks and divides by 3,500 to estimate monthly fat loss in pounds. That value is also converted to kilograms using the 0.453592 factor. For instance, burning 343 kcal per session yields about 1,715 kcal per week, roughly 6,860 kcal per month, and an estimated 1.96 lb (0.9 kg) of fat loss per month from exercise alone.

Keep in mind this is a simplified model. Real weight change depends heavily on diet, total daily energy expenditure, sleep, hormones, and metabolic adaptation. The 3,500-calorie rule overstates long-term loss because metabolism adjusts as you lose mass. Use the estimate as motivation and a planning baseline, not a guarantee.

The MET method is a population-average model. It assumes a "standard" individual and does not account for differences in body composition, fitness level, exercise efficiency, terrain, or environmental conditions such as heat and altitude. A highly trained athlete and a beginner can have meaningfully different calorie costs for the exact same activity, even at identical body weight.

To get the most reliable estimate from this exercise calorie calculator, weigh yourself accurately, enter realistic durations of actual activity (excluding rest breaks), and choose the activity that most closely matches your true intensity. If you use a heart-rate monitor or a metabolic cart that reports a specific MET, enter it in the custom MET field to override the default.

• Use it for trends, not single-calorie precision — compare workouts to each other rather than treating one number as exact.
• Combine with nutrition tracking for weight goals, since intake usually outweighs exercise burn.
• Recalculate as your weight changes, because heavier bodies burn more calories for the same activity.

For clinical or competitive purposes, indirect calorimetry remains the gold standard; the calculator is intended for everyday fitness planning and education.