: I want to know the exact formula to calculate metabolic age I want to know the exact formula to calculate metabolic age. How do i get the average bmr of people in the chronological age group? Is here any link I could get

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You can check out the page at Wikipedia, at the section BMR estimation formulas

There are several formulas there, I'll not copy/paste everything, better to look there for more explanations.

The Original Harris-Benedict Equation [1919]

for men:

for women:

where P is total heat production at complete rest, m is the weight, h is the height, and a is the age, and with the difference in BMR for men and women being mainly due to differences in body weight.2 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).
In 1984, the original Harris-Benedict equations were revised3 using new data. In comparisons with actual expenditure, the revised equations were found to be more accurate.4

The Revised Harris-Benedict Equation [1984]

for men:

for women:

The Mifflin St Jeor Equation [1990]

where s is +5 for males and ?161 for females.

The Katch-McArdle Formula (BMR)

where LBM is the lean body mass in kg

The Cunningham Formula (RMR)

where LBM is the lean body mass in kg