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BMR & TDEE Calculator
Calculate basal metabolic rate and daily energy needs
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Your BMR — Estimated calories your body needs at complete rest.
Estimated TDEE (Maintenance)
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BMR × activity factor.
Formula (Mifflin–St Jeor)
TDEE is an estimate. For fat loss, eat below TDEE; for muscle gain, eat above. Adjust by ~250–500 kcal and track progress.
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Frequently Asked Questions
What exactly is BMR?
It stands for Basal Metabolic Rate—the number of calories your body burns while performing basic life-sustaining functions like breathing.
Is BMR the same for everyone?
No. It depends heavily on your age, gender, height, and weight. Generally, heavier and taller individuals have a higher BMR.
Does BMR change with activity?
BMR is your rate at rest. To get your total daily needs, you must multiply BMR by an activity factor (this is called TDEE).
Why decreases BMR with age?
As you age, muscle mass tends to decrease and fat accounts for a larger percentage of weight, slowing down calorie burning.