References

Sources behind the calculator

The calculator favors primary equation papers, systematic reviews, and major evidence summaries. Links below go to PubMed, PubMed Central, NCBI Bookshelf, or the guideline publisher where available.

Core equations

1. Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990;51(2):241-247. PMID 2305711.
2. Roza AM, Shizgal HM. The Harris Benedict equation reevaluated: resting energy requirements and the body cell mass. Am J Clin Nutr. 1984;40(1):168-182. PMID 6741850.
3. Cunningham JJ. Body composition as a determinant of energy expenditure: a synthetic review and a proposed general prediction equation. Am J Clin Nutr. 1991;54(6):963-969. PMID 1957828.
4. ten Haaf T, Weijs PJM. Resting energy expenditure prediction in recreational athletes of 18–35 years: confirmation of Cunningham equation and an improved weight-based alternative. PLoS One. 2014;9(9):e108460. PMID 25275434.

General validation and interpretation

1. Frankenfield D, Roth-Yousey L, Compher C. Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults: a systematic review. J Am Diet Assoc. 2005;105(5):775-789. PMID 15883556.
2. National Academies of Sciences, Engineering, and Medicine. Dietary Reference Intakes for Energy. 2023. Chapter 4: Factors Affecting Energy Expenditure and Requirements. NCBI Bookshelf.

Older adults

1. Prediction of resting energy expenditure in healthy older adults: a systematic review. The review found low average bias for Mifflin but limited individual precision, with no equation both highly accurate and precise for all older adults. PMID 33288302.

Overweight, obesity, and severe obesity

1. Madden AM, Mulrooney HM, Shah S. Estimation of energy expenditure using prediction equations in overweight and obese adults: a systematic review. J Hum Nutr Diet. 2016;29(4):458-476. PMID 26923904.
2. Macena ML, et al. Estimates of resting energy expenditure and total energy expenditure using predictive equations in adults with overweight and obesity: a systematic review with meta-analysis. Nutr Rev. 2022;80(11):2113-2135. PMID 35551409.
3. Adequacy of basal metabolic rate prediction equations in individuals with severe obesity: a systematic review and meta-analysis. Obes Rev. 2024;25(6):e13739. PMID 38548479.

Athletes

1. O’Neill JER, Corish CA, Horner K. Accuracy of Resting Metabolic Rate Prediction Equations in Athletes: A Systematic Review with Meta-analysis. Sports Med. 2023;53(12):2373-2398. PMID 37632665 / PMC full text.

Pregnancy

1. Energy expenditure during pregnancy: a systematic review. PMID 32974660.
2. Dal N, Tek N. Energy expenditure in healthy pregnant women: a systematic review. Nutr Rev. 2025;83(2):e223-e236. PMID 38417456.

Weight loss and adaptive thermogenesis

1. Nunes CL, et al. Does adaptive thermogenesis occur after weight loss in adults? A systematic review. Br J Nutr. 2022;127(3):451-469. PMID 33762040.
2. Macena ML, et al. Longitudinal estimates of resting energy expenditure using predictive equations in individuals with excess weight after weight loss: a systematic review with meta-analysis. Clin Nutr ESPEN. 2023;58:263-269. PMID 38057015.

Menstrual-cycle context

1. Effect of menstrual cycle on resting metabolism: a systematic review and meta-analysis. PMID 32658929.
2. Hurtová A, Gimunová M, Beníčková M. Resting metabolic rate fluctuations across the menstrual cycle: a systematic review. Front Physiol. 2026. PMID 41971666.