BMR Calculator

BMR Calculator FAQs

1. What is BMR (Basal Metabolic Rate)?

BMR is the minimum energy your body needs at complete rest to support essential functions such as breathing, blood circulation, and body temperature regulation.

2. What is a normal BMR for adults?

There is no single normal BMR. Resting calorie needs vary with age, height, weight, sex, and body composition. An online calculator provides an individual estimate rather than a fixed target.

3. Which formula does the BMR Calculator use?

The HealthBel BMR Calculator uses the Mifflin–St Jeor equation to estimate resting energy expenditure from age, height, weight, and a sex-based coefficient. Results are estimates, not direct measurements.

4. Does muscle mass affect BMR?

Yes. Lean body tissue contributes to resting energy needs. People with more muscle mass often burn more calories at rest, although body size and other factors also influence metabolism.

5. Does BMR decrease with age?

BMR often decreases with age, partly because muscle mass and body composition change over time. However, the rate of decline varies between individuals.

6. Is BMR different for men and women?

BMR can differ because body size, lean mass, and hormonal factors influence energy expenditure. The Mifflin–St Jeor equation uses different male- and female-based coefficients.

7. Can dieting lower your BMR?

Yes. Prolonged calorie restriction and weight loss can reduce resting energy expenditure. This may reflect a smaller body size and metabolic adaptations that conserve energy.

8. What is the difference between BMR, RMR, and TDEE?

BMR measures energy needs under strict resting conditions. RMR estimates energy used at rest under less restrictive conditions. TDEE includes resting energy, physical activity, and food digestion.