What Is Basal Metabolic Rate (BMR)?

Basal metabolic rate (BMR) is the number of calories your body burns at complete rest to keep vital functions running — breathing, circulation, cell repair, and temperature regulation. It accounts for roughly 60–75% of your total daily energy expenditure.

Key Facts

BMR vs. RMR: BMR is measured under stricter conditions (fasting, fully at rest); resting metabolic rate (RMR) is a slightly less strict measurement. The two are used interchangeably in practice.
What drives BMR: Age, sex, muscle mass, genetics, and body composition. More muscle = higher BMR, because muscle burns more calories than fat at rest.
Clinical formula: The Mifflin-St Jeor equation is the most widely used validated formula for estimating BMR.
Why it matters: Total daily energy expenditure (TDEE) = BMR + activity + digestion. Eating below TDEE but above BMR supports steady fat loss.
Crash diets lower BMR: Severe calorie restriction makes the body conserve energy, dropping BMR over time — a key reason strict diets often backfire.

Learn more: If you are looking for help with this in the Temecula area, medical weight loss program in Temecula can support your goals with personalized, professional care.

Why Calculate BMR?

Knowing your BMR tells you where to start. Because muscle raises BMR, strength training and adequate protein support a healthier metabolic rate than cardio alone. A sustainable approach preserves muscle while losing fat.

Ready to Take the Next Step?

At Mind & Body Rejuvenation Clinic in Temecula, we help clients reach their wellness goals with personalized, professional care. Call 951-365-8163 or contact us to book your free consultation.

Published with local expertise by the Mind & Body Rejuvenation Clinic team. Last reviewed 2026-08-11. Serving Temecula, Murrieta, Menifee, and surrounding areas.