Mifflin-St Jeor Equation

Tool to predict daily energy expenditure in healthy adults.


The Mifflin-St Jeor equation is a widely used tool to determine the resting metabolic rate [RMR], which is defined as the number of calories burned while the body is in complete rest. RMR is also known as resting energy expenditure [REE]. The equation was developed by MD Mifflin and ST St Jeor and first introduced in a paper published in 1990.

There are several equations for measuring RMR, including the most popular Harris-Benedict equation which was developed in 1919 and revised for accuracy in 1984. A comparative study of four predictive equations found that the Mifflin-St Jeor equation is more likely than the other equations to predict RMR to within 10% of that measured.


Females: (10*weight [kg]) + (6.25*height [cm]) – (5*age [years]) – 161
Males: (10*weight [kg]) + (6.25*height [cm]) – (5*age [years]) + 5

Multiply by scale factor for activity level:
Sedentary *1.2
Lightly active *1.375
Moderately active *1.55
Active *1.725
Very active *1.9


Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO.

Am J Clin Nutr. 1990;51(2):241-7. doi: 10.1093/ajcn/51.2.241.

Frankenfield D, Roth-Yousey L, Compher C.

J Am Diet Assoc. 2005;105(5):775-89. doi: 10.1016/j.jada.2005.02.005.

The Mifflin-St Jeor Equation calculator is created by QxMD.

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