Your BMR (Basal Metabolic Rate) is the estimated minimum level of energy required to sustain the body’s vital functions when at rest. The Harris-Benedict formula is used to calculate the BMR (Basal Metabolic Rate).

The physical activity level (PAL) is a way to express a person’s daily physical activity as a number, and is used to estimate a person’s total energy expenditure. In combination with the basal metabolic rate, it can be used to compute the amount of food energy a person needs to consume in order to maintain a particular lifestyle.