Health Formula • Published on September 01, 2026 • Last updated September 01, 2026
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Body weight in kilograms
Height in centimeters
Age in years
Gender constant: +5 for men, −161 for women
Factor ranging roughly 1.2 (sedentary) to 1.9 (extremely active) reflecting daily activity level
The Mifflin-St Jeor Equation calculates Basal Metabolic Rate (BMR) — the calories your body burns at complete rest — from weight, height, age, and gender. Multiplying BMR by an activity factor scales it up to Total Daily Energy Expenditure (TDEE), the actual number of calories burned per day including movement and exercise, which is the standard baseline for setting weight loss, maintenance, or gain calorie targets.
Mifflin-St Jeor was developed later using more modern body composition data and has been shown in validation studies to more accurately predict BMR for most adults compared to the original 1919 Harris-Benedict equation.
A deficit of 500 kcal/day from TDEE typically produces about 0.5 kg (1 lb) of weight loss per week, which is generally considered a safe and sustainable rate for most adults.
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