Calorie burned Calculator

The accuracy of this calculation is significantly affected by MET. By convention, 1 MET is roughly equivalent to expending 1 Calorie per kilogram of body weight per hour or consuming 3.5 mL of oxygen per kilogram of body mass per minute. This convention was derived based on a single specific subject: a healthy 40-year-old male who weighed 70 kilograms. A person's resting metabolic rate (RMR) is highly dependent on a number of factors (described above) such as lean body mass (total body weight - body fat weight), age, health status, and more. Thus, calculations for an individual whose RMR varies significantly from that of the subject used as a reference will be less accurate; some studies have shown that the conventional 1 MET value overestimates oxygen consumption at rest by up to 20-30% on average.

The estimate is also affected by the fact that MET values were derived under the assumption that the activity is performed at a constant rate. For example, playing tennis for 1 hour can involve taking breaks between games, resting, chatting, etc., meaning that the activity is only truly performed for a shorter duration. If the duration is not represented accurately, this will affect the accuracy of the calculation, and in general, will result in an overestimate of calories burned.