BMR Calculator

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Understanding Basal Metabolic Rate

Your BMR accounts for approximately 60-75% of your total daily calorie burn. The remaining calories are burned through physical activity (15-30%) and the thermic effect of food (10%). Understanding your BMR is the foundation for any effective nutrition or weight management plan.

Factors That Affect BMR

🧬 Genetics

Your genetic makeup accounts for up to 80% of the variance in BMR between individuals of similar size.

💪 Muscle Mass

Muscle tissue burns more calories at rest than fat tissue. More muscle = higher BMR.

🌡️ Body Temperature

A 0.5°C increase in body temperature raises BMR by approximately 7%.

🩺 Thyroid Function

Thyroid hormones are the primary regulators of metabolic rate. Hypothyroidism can lower BMR significantly.

How to Boost Your BMR

While you can't dramatically change your BMR, certain strategies can help: strength training to build muscle mass, eating adequate protein, staying hydrated, getting sufficient sleep, and avoiding prolonged calorie restriction which can lower your metabolic rate.

Frequently Asked Questions

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, cell production, and nutrient processing while at complete rest.

BMR measures calories burned at rest, while TDEE (Total Daily Energy Expenditure) includes all daily activities. TDEE = BMR × Activity Multiplier. TDEE is always higher than BMR.

The Mifflin-St Jeor equation is considered the most accurate for most adults, which is why it's highlighted as the primary result. The Harris-Benedict equation tends to overestimate by about 5%.

No. Eating at or below BMR can slow your metabolism and cause muscle loss. For healthy weight loss, aim for a 500-calorie deficit from your TDEE, not your BMR.

Yes. BMR typically decreases by about 1-2% per decade after age 20, primarily due to loss of muscle mass. Regular strength training can help maintain a higher BMR.

Disclaimer: This calculator is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider before making health decisions.