Resting Metabolic Rate Calculator
Calculate your RMR using Mifflin-St Jeor equation with adjustments for body composition and metabolic efficiency
About this calculator
The Resting Metabolic Rate Calculator determines how many calories your body burns at rest to maintain basic physiological functions like breathing, circulation, and cellular repair. Using the scientifically-validated Mifflin-St Jeor equation with advanced adjustments for body composition and metabolic efficiency, this tool provides a more accurate baseline for creating personalized nutrition and weight management plans. Understanding your RMR is essential for setting realistic calorie goals, whether you're trying to lose weight, gain muscle, or maintain your current physique.
How to use
Enter your age, gender, height, and weight into the calculator fields. If available, include body fat percentage for enhanced accuracy. The calculator will instantly compute your RMR using the Mifflin-St Jeor equation with body composition adjustments. Use this baseline to determine your total daily energy expenditure by factoring in your activity level.
Frequently asked questions
What's the difference between RMR and BMR?
RMR (Resting Metabolic Rate) is slightly higher than BMR (Basal Metabolic Rate) as it includes minimal daily activities, while BMR measures calories burned in complete rest.
How accurate is the Mifflin-St Jeor equation?
The Mifflin-St Jeor equation is considered the most accurate formula for healthy individuals, with approximately 90% accuracy for most people when body composition is considered.
Should I eat exactly my RMR calories to lose weight?
No, eating below RMR can slow metabolism and cause muscle loss. Create a moderate deficit from your Total Daily Energy Expenditure (TDEE) instead.