Mifflin-St Jeor Calculator
Estimate resting metabolic rate (RMR) and total daily energy expenditure using the Mifflin-St Jeor equation, the gold standard for clinical nutrition assessment.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Resting Metabolic Rate (kcal/day)
1,618
How to Use This Calculator
- Enter the patient's weight in kg and height in cm.
- Enter age in years and select sex.
- Choose an activity level multiplier (sedentary through very active).
- Review the Resting Metabolic Rate (RMR) and adjusted Total Energy Expenditure.
- Use the result as the basis for caloric prescription; adjust based on weight trend.
How the result changes with Height (cm)
| Height (cm) | Resting Metabolic Rate (kcal/day) |
|---|---|
| 115 | 1,274 |
| 153 | 1,511 |
| 198 | 1,793 |
| 235 | 2,024 |
What each input means
- Weight (kg)
- Body weight in kilograms.
- Height (cm)
- Height in centimeters.
- Age (years)
- Age in years.
- Sex (0 = Female, 1 = Male)
- Biological sex: 0 for female, 1 for male.
- Activity level (1-5)
- 1 = Sedentary, 2 = Lightly active, 3 = Moderately active, 4 = Active, 5 = Very active.
What each result means
- Resting Metabolic Rate (kcal/day)
- Calories burned at rest using the Mifflin-St Jeor equation.
- Total Daily Energy Expenditure (kcal/day)
- RMR adjusted for activity level.
- Activity factor
- Multiplier applied to RMR.
- Protein (g/day)
- Estimated protein at 1.2 g/kg body weight.
- Fat (g/day)
- Estimated fat at 25% of TDEE.
- Carbohydrates (g/day)
- Remaining calories allocated to carbohydrates.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersWeight (kg) = 70, Height (cm) = 170, Age (years) = 30, Sex (0 = Female, 1 = Male) = 1 = 5 input(s) provided
- Calculate Resting Metabolic Rate1618 = 1618
- Calculate Total Daily Energy ExpenditureTotal Daily Energy Expenditure = rmrClamped * af1941 = 1941
- Calculate Activity factor1.2 = 1.2
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