Advanced Mifflin-St Jeor Equation Calculator
Determine your precise BMR, TDEE, and customized weight management calorie targets using the gold-standard clinical formula.
Metabolic Target Outputs
Basal Metabolic Rate (BMR)
-- kcal
Total Daily Energy Expenditure
-- kcal
Target Goal Recommendation
--
Caloric Target Breakdown Visualizer
1,000 kcal
2,000 kcal
3,000 kcal
4,000+ kcal
Current Maintenance TDEE: -- kcal/day
The Clinical Precision of the Mifflin-St Jeor Equation
Introduced in 1990 by Dr. M.D. Mifflin and Dr. S.T. St Jeor, this formula replaced older standards like the Harris-Benedict equation as the benchmark for estimating resting energy expenditure. Clinical studies consistently demonstrate that it yields the most accurate predictive results for contemporary populations.
BMR vs. TDEE: Understanding Your Energy Needs
- Basal Metabolic Rate (BMR): The baseline energy your organs require to stay alive at complete rest.
- Total Daily Energy Expenditure (TDEE): BMR multiplied by your physical activity level (PAL), accounting for digestion, daily movement, and structured exercise.
Applying Calorie Targets for Body Composition Goals
To achieve sustainable weight loss, creating a moderate deficit of 300 to 500 calories below your TDEE ensures fat loss while preserving lean muscle mass. Conversely, fueling a slight surplus above TDEE supports muscle hypertrophy during resistance training programs.