Woman: BMR= 655 + (4.35 x weight in pounds) + (4.7 x height in inches) - (4.7 x age in years). man: bmr 66 + (6.23 x weight in pounds) + (12.7 x height in inches) – (6.8 x age in years). This formula decides your calorie needs.
You can calculate your basic metabolic rate online (look for BMR calculators) by putting in your height, weight, age, and sex. Other measurements might be required, but these will basically give you the answer.
Women: 655 + (4.35 x weight in pounds) + (4.7 x height in inches) - (4.7 x age in years). Men: 66 + (6.23 x weight in pounds) + (12.7 x height in inches) - (6.8 x age in years)