The Basal Metabolic Rate BMR Calculator estimates your basal metabolic rateβthe amount of energy expended while at rest in a neutrally temperate environment, and in a post-absorptive state meaning that the digestive system is inactive, which requires about 12 hours of fasting.
Exercise: minutes of elevated heart rate activity. Intense exercise: minutes of elevated heart rate activity. The basal metabolic rate BMR is the amount of energy needed while resting in a temperate environment when the digestive system is inactive. It is the equivalent of figuring out how much gas an idle car consumes while parked. In such a state, energy will be used only to maintain vital organs, which include the heart, lungs, kidneys, nervous system, intestines, liver, lungs, sex organs, muscles, and skin.
The BMR is measured under very restrictive circumstances while awake. An accurate BMR measurement requires that a person's sympathetic nervous system is inactive, which means the person must be completely rested. Basal metabolism is usually the largest component of a person's total caloric needs.
The daily caloric need is the BMR value multiplied by a factor with a value between 1. In most situations, the BMR is estimated with equations summarized from statistical data. The Harris-Benedict Equation was one of the earliest equations introduced. It was revised in to be more accurate and was used up until , when the Mifflin-St Jeor Equation was introduced.
Of these equations, the Mifflin-St Jeor Equation is considered the most accurate equation for calculating BMR with the exception that the Katch-McArdle Formula can be more accurate for people who are leaner and know their body fat percentage.
