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  • Writer's pictureDennis Romatz

Mifflin-St Jeor Metabolic Rate Estimator

The Mifflin-St Jeor equation is a widely used method for estimating resting metabolic rate (RMR), which represents the number of calories the body needs at rest to maintain basic bodily functions such as breathing, circulation, and cell production.


This equation is named after its developers, James A. Mifflin and Stacey B. St Jeor, who introduced it in 1990 as a more accurate alternative to previous equations for estimating RMR.


Mifflin-St Jeor Metabolic Rate Estimator
Mifflin-St Jeor Metabolic Rate Estimator


The Mifflin-St Jeor equation takes into account several factors that influence metabolic rate, including age, gender, weight, and height. The formula differs slightly for men and women:


For men: RMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5


For women: RMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161


Once the RMR is calculated using this equation, it can be used to estimate total daily energy expenditure (TDEE) by factoring in physical activity level (PAL). TDEE represents the total number of calories the body needs in a day, including calories burned through physical activity.


The Mifflin-St Jeor equation is considered one of the most accurate methods for estimating RMR, particularly when compared to other equations such as the Harris-Benedict equation.


However, it's important to note that these equations provide estimates rather than precise measurements, and individual variations in metabolism may result in some degree of error.


Despite its widespread use, the Mifflin-St Jeor equation may not be suitable for everyone, especially individuals with certain medical conditions or highly active lifestyles.


In such cases, direct measurement of metabolic rate through techniques like indirect calorimetry may be more appropriate for accurate assessment.


About the Author:  Dennis Romatz is the owner of Dennis Romatz Fitness and an Internationally acclaimed personal trainer, online fitness coach and nutrition coach who uses and fully endorses the Mifflin-St Jeor Metabolic Rate Estimator.


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