The **Harris-Benedict formula** can be used to calculate a person's *basal metabolic rate*. Factors such as body weight, height, gender and age are taken into account. Fddb uses this formula to determine your basal metabolic rate.

There are 2 different formulas for men and women.

**Formula for men:***Daily basal metabolic rate = 66.5 + (13.7 x body weight in kg) + (5 x height in cm) - (6.8 x age in years)*

Example calculation for a 28-year-old man weighing 80 kg and measuring 1.80 m tall:

- Daily basal metabolic rate = 66.5 + (13.7 x 80) + (5 x 180) - (6.8 x 28) =
**1872.1 kcal**

**Formula for women:***Daily basal metabolic rate = 655 + (9.6 x body weight in kg) + (1.8 x height in cm) - (4.7 x age in years)*

Example calculation for a 28-year-old woman weighing 70 kg and measuring 1.70 m tall:

- Daily basal metabolic rate = 655 + (9.6 x 70) + (1.8 x 170) - (4.7 x 28) =
**1501.4 kcal**

The result of these calculations is a guide value of the energy a person needs per day for his/her basal metabolic rate.