BMR (Men) = (10 × W_kg) + (6.25 × H_cm) - (5 × Age) + 5 BMR (Women) = (10 × W_kg) + (6.25 × H_cm) - (5 × Age) - 161
Published in 1990 by Mifflin et al., the Mifflin-St Jeor equation is clinically recognized as the most accurate non-laboratory method for estimating BMR in healthy adults.
Clinical Limitations & Considerations
BMR formulas estimate energy expenditure for average body compositions. Highly muscular athletes may burn significantly more calories at rest, while individuals with low muscle mass or thyroid disorders may have a lower actual BMR than predicted.
Scientific References & Literature
- Mifflin, M. D., et al. (1990). "A new predictive equation for resting energy expenditure in healthy individuals." The American Journal of Clinical Nutrition, 51(2), 241-247.
- Frankenfield, D., et al. (2005). "Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults." Journal of the American Dietetic Association, 105(5), 775-789.
Frequently Asked Questions
What is the difference between BMR and RMR?
BMR (Basal Metabolic Rate) is measured under strict laboratory conditions immediately upon waking after 8 hours of sleep and 12 hours of fasting. RMR (Resting Metabolic Rate) is less restrictive but typically yields values within 5-10% of BMR.
Can you eat below your BMR?
Eating significantly below your BMR for extended periods is generally discouraged by dietitians because it can trigger muscle wasting, hormonal disruption, and extreme lethargy. Weight loss plans should target a deficit relative to TDEE, not BMR.