The formula for calculating basal metabolic rate requires a combination of pulse rate, pulse pressure difference, height and weight. 1. Basal metabolic rate = (pulse rate + differential pulse pressure – 111) x 100%. For example, if a person’s pulse rate is 80 beats per minute and his blood pressure is 120/80 mmHg, then pulse pressure difference = systolic blood pressure – diastolic blood pressure = 120 – 80 = 40 mmHg, and the basal metabolic rate is (80 + 40 – 111) x 100% = 9%. 2. Basal metabolic rate = [ 0.75 × (pulse rate + pulse pressure difference × 0. 74) – 72] × 100%. Using the above data as an example, the basal metabolic rate is [ 0.75 × (80 + 40 × 0. 74) – 72] × 100% = 10.2%. 3. It is also possible to use the classic Harris Benedict formula to estimate the quiet daily energy requirement from body weight and age. Male basal metabolic rate (kcal/day) = 66 + (13.7 × body weight/kg) + (5 × height/cm) – (6.8 × age) Female basal metabolic rate (kcal/day) = 655 + (9.6 x weight/kg) + (1.8 x height/cm) – (4.7 x age) Where the formula derivation method is widely used due to its simplicity and ease of use, although it has some error and can only be estimated.