Rangdom

BMR and TDEE from sex, age, height, and weight (Mifflin–St Jeor)

Your Basal Metabolic Rate is the energy your body uses at rest. This tool uses the Mifflin–St Jeor equation: BMR = 10·kg + 6.25·cm − 5·age + 5 for males and BMR = 10·kg + 6.25·cm − 5·age − 161 for females. Choose Metric to enter height in centimeters and weight in kilograms, or Imperial for inches and pounds (converted with kg = lb ÷ 2.20462 and cm = in × 2.54).

Total Daily Energy Expenditure multiplies the BMR by an activity factor — Sedentary 1.2, Light 1.375, Moderate 1.55, Active 1.725, and Very active 1.9 — to estimate the calories needed to maintain your current weight. Results update live as you type, rounded to whole kcal/day, with an inline error instead of a result when the age, height, or weight is empty, non-numeric, zero, or negative. This is the Mifflin–St Jeor method only — macro splits, weight-loss timelines, alternate methods (Harris–Benedict, Katch–McArdle), and any health advice are out of scope.