What formula is used?

Basal metabolic rate (BMR) uses the Mifflin-St Jeor equation based on sex, age, height, and weight. Total daily energy expenditure (TDEE) multiplies BMR by your selected activity level to estimate maintenance calories — a starting point before you adjust based on real-world weight trends over several weeks.

What activity multipliers are used?

Common multipliers are: sedentary 1.2, lightly active 1.375, moderately active 1.55, very active 1.725, and extra active 1.9. These scale resting metabolism to account for daily movement and exercise. Most people overestimate activity — when in doubt, choose a lower factor.

No — results estimate maintenance calories only. For weight loss, gain, or medical conditions, adjust intake with a registered dietitian or clinician who can personalize targets beyond a formula estimate. Illness, pregnancy, and extreme body composition can misestimate daily needs.