Basal metabolic rate is the energy your body spends simply staying alive: breathing, circulation, body temperature and organ function. It is usually the largest part of your daily expenditure.
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Formula and method
Mifflin–St Jeor by default, because it was derived on a modern population and has the best validation record. Harris–Benedict and Katch–McArdle are also available.
Formula used
Mifflin-St Jeor (default), Harris-Benedict revised, or Katch-McArdle
Assumptions and limits
- Katch–McArdle is sex-independent because it works from lean mass directly — but it needs a measured body fat percentage.
- This is a population estimate. Two people of the same height and weight can differ by as much as ten percent.
Scientific sources
Mifflin MD, St Jeor ST, Hill LA, et al. “A new predictive equation for resting energy expenditure in healthy individuals.” Am J Clin Nutr. 1990;51(2):241-247.
View sourceRoza AM, Shizgal HM. “The Harris Benedict equation reevaluated.” Am J Clin Nutr. 1984;40(1):168-182.
View sourceMcArdle WD, Katch FI, Katch VL. Exercise Physiology: Nutrition, Energy, and Human Performance. 8th ed. Wolters Kluwer, 2015.