Metabolism tools translate your weight, height, age and sex into the numbers behind energy balance: BMR (resting burn), TDEE (total daily burn), and the calorie deficit or surplus needed to move your weight in a controlled direction.
BMR Calculator
Mifflin-St Jeor / Harris-Benedict.
TDEE Calculator
Daily energy needs by activity level.
Calorie Deficit
Deficit needed to hit a weight goal.
Reverse Target Weight
Goal BMI to target weight + weekly plan.
Fitness Goal Guide
Fat loss vs muscle vs health path.
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All tools provide educational health metric estimations only — not medical advice, diagnosis, or treatment.