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Basal metabolic rate is the rate of energy expenditure per unit  time by at rest.  It is reported in energy units per unit time ranging from watt to  ml O₂/min or joule per hour per kg body mass J/.  Proper measurement requires a strict set of criteria be met.

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BMR(Basal Metabolic Rate) is an estimate of how many calories you would burn if you were to do nothing but rest for 24 hours.It represents the minimum amount of energy needed for the functioning of the body , including breathing and keeping your heart beating .

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Basal Metabolic Rate is the amount of energy expressed in calories that a person needs to keep the body functioning at rest. Some of those processes are breathing, blood circulation, controlling body temperature, cell growth, brain and nerve function, and contraction of muscles. Basal metabolic rate (BMR) affects the rate that a person burns calories and ultimately whether you maintain, gain, or lose weight. Your basal metabolic rate accounts for about 60 to 75% of the calories you burn every day. It is influenced by several factors.        BMR estimation formula byHarris-Benedict equation, which was created in 1919.

• for men, P=[(13.7516m/1kg)+(5.003h/1cm)-(6.7550a/1yr)+66.4736]k.cal/day
• for women,P=[(9.564m/1kg)+(1.8496h/1cm)-(4.6756a/1yr)+65.0955]  where P is total heat production at complete rest, m is mass (kg), h is height (cm), and a is age (years), and with the difference in BMR for men and women being mainly due to differences in body weight.[3] For example, a 55-year-old woman weighing 130 lb (59 kg) and 5 feet 6 inches (168 cm) tall would have a BMR of 1272 kcal per day or 53 kcal/h (61.3 watts).

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Basal metabolic rate is the amount of energy expended while at rest in a neutrally temperate environment,inthe post absorptive state(meaning that digestive system is inactive, which requires about 12 hours of fasting). The release of the energy in this stage is sufficient only for the functioning of the vital organs such as the heart, lungs, brain and the rest of the nervous systems, liver kidneys, sex oragans, muscles and skin. BMR decresses with age and with the loss of lean body mass. Increasing muscle mass increases BMR.

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