Introducing Dr. Fitology's calorie expenditure calculator, a resource designed to streamline the process of determining calories burned, all while enhancing your understanding. This tool employs inputs such as step count and walking pace over a specific time frame, or factors in activity type and duration, to offer an estimate of your expended calories. Functioning on the principle of energy expenditure, quantified using MET – the metabolic equivalent of a task – this calculator derives its calculations. The MET values are derived from a reputable scientific study titled "2011 Compendium of Physical Activities: A Second Update of Codes and MET Values," which was published in the well-regarded journal Medicine and Science in Sports and Exercise. This measurement indicates the calories burned per hour of activity, per kilogram of body weight. Importantly, the MET value reflects the intensity of an activity, with higher values associated with more energy-demanding tasks.