# Calculate Your Resting Metabolic Rate

The calculators below estimate your Resting Metabolic Rate (RMR) using the* Mifflin-St. Jeor equation *and your weight, height, and age. Choose the calculator that uses the units (e.g., pounds or kilograms) that you’re most familiar with, then input your values into the **green** cells.

## Limitations

The Mifflin-St. Jeor equations are perfect, but they have been shown to be the most accurate relative to other popular RMR formulas. (See, for example, Frankenfield, D. et al., “Comparison of Predictive Equations for Resting Metabolic Rate in Healthy Nonobese and Obese Adults: A Systematic Review,”

*Journal of the Academy of Nutrition and Dietetics*, Volume 105, Issue 5 (2005), pgs. 775–789.)

Do these calculations for RMR account for the amount of kcal used up by your particular microbiome?

Good question. I doubt they do. The Mifflin-St. Jeor formulas, like most RMR estimates, are created from indirect calorimetry measurements of energy expenditure. Because this technique relies largely on O2 and CO2 exchange, and because gut bacteria are present in mostly anaerobic environments, indirect calorimetry largely ignores the microbiome of the subjects used to generate the RMR equations.