What this calculator tells you
Basal metabolic rate is an estimate of the energy your body uses at rest for essential functions. It is the starting point for a calorie-maintenance estimate, not a daily intake target by itself.
How to use the BMR Calculator
- 1
Select the equation constant and your preferred units.
- 2
Enter age, height, and current weight.
- 3
Use the result as a resting baseline, not a complete calorie prescription.
Formula and interpretation
Method
Mifflin–St Jeor: 10 × weight(kg) + 6.25 × height(cm) − 5 × age, then +5 for the male equation or −161 for the female equation.
How to read the result
Your real resting expenditure can differ. Use the estimate as a baseline, then combine it with activity and observed weight trends.
Important limitations
The formula was developed from adult group data and uses sex-specific constants. Pregnancy, illness, unusual body composition, and some medications can make it less representative.
BMR Calculator questions
Is BMR the same as TDEE?
No. BMR estimates resting energy use; TDEE adds activity and daily movement.
Why can my actual BMR differ?
Predictive equations describe averages. Lean mass, genetics, health, and measurement conditions all affect resting expenditure.
