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BMR Calculator
Basal Metabolic Rate — the calories your body burns at complete rest. The foundation of every calorie target.
Your basal metabolic rate—kcal/day
Frequently asked questions
What is BMR?
Calories your body burns at complete rest to maintain basic functions. The floor for any calorie target.
Mifflin-St Jeor vs Harris-Benedict?
Mifflin-St Jeor is more accurate for modern, non-obese populations. Harris-Benedict was developed in 1919 and tends to overestimate.
Does BMR change with age?
Yes — BMR decreases ~1–2% per decade after age 20 due to loss of metabolically active lean mass.