Key Takeaways

  • The Mifflin-St Jeor equation (1990) is considered the most accurate REE prediction for the general population.[1]
  • REE typically accounts for 60–75% of total daily energy expenditure, making it the largest component of calorie burn.[2]
  • Formulas can differ by 100–300 kcal/day depending on body composition and age — comparing multiple estimates provides a realistic range.[3]

How the Formulas Work

Mifflin-St Jeor: 10×weight(kg) + 6.25×height(cm) − 5×age + s

(s = +5 for males, −161 for females)

Cunningham: 500 + 22 × lean body mass(kg)

(requires body fat %)

The Cunningham formula is particularly accurate for athletic individuals with known body composition, as it directly accounts for lean mass rather than total body weight.[3]

To calculate your total daily energy expenditure including activity, use the AMR (Active Metabolic Rate) Calculator.

Limitations and Important Notes

  • All formulas are population-derived estimates. Individual REE can vary ±10% from predicted values.
  • The Harris-Benedict equation tends to overestimate REE in individuals with obesity.
  • REE decreases with age and is affected by thyroid function, body temperature, and other physiological factors not captured by these equations.
  • This tool is for informational and journaling purposes only. It does not constitute personalized advice.

Frequently Asked Questions

Sources & References

  1. Comparison of predictive equations for resting metabolic rate. Various. PMC (2023)
  2. A new predictive equation for resting energy expenditure in healthy individuals. Mifflin MD, St Jeor ST, et al.. Am J Clin Nutr (1990)
  3. Body composition and resting metabolic rate. Cunningham JJ. Am J Clin Nutr (1991)
Manish Kumar
Manish Kumar

Certified Personal Trainer & Sports Nutritionist

NASM-CPTCertified Sports Nutritionist10+ Years Experience500+ Clients Coached

NASM-certified fitness and nutrition coach with over 10 years of hands-on experience helping people build strength, lose fat, and live healthier lives. Specializing in gym-based workouts with a strong focus on lifting technique, biomechanics, and practical exercise science. Through FitLifeRegime, sharing the tools, tips, and insights that have worked for hundreds of clients — helping you start your own fitness journey with confidence and clarity.

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This tool is for informational and journaling purposes only.

I am NOT a doctor.