Calculadora de TMB (Mifflin-St Jeor)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
TMB = 10·P + 6,25·H − 5·I + s (s = +5 homem / −161 mulher)
About this calculator
The TMB (Mifflin-St Jeor) Calculator estimates the Basal Metabolic Rate, the number of calories your body burns at complete rest to maintain vital functions like breathing, circulation, and body temperature. The Mifflin-St Jeor equation is considered by modern meta-analyses to be the most accurate for the general population, surpassing the Harris-Benedict equation. It uses weight (kg), height (cm), age (years), and sex, with specific adjustments for men and women.
The calculation works as follows: for men, BMR equals 10 times weight in kg, plus 6.25 times height in cm, minus 5 times age in years, plus 5. For women, the formula is the same but subtracts 161 at the end. For example, a 30-year-old man weighing 80 kg and 180 cm tall has a BMR of approximately 1,780 kcal/day. This value represents the minimum calorie expenditure, excluding physical activity or digestion.
Use this calculator for diet planning, weight control, or adjusting caloric intake in weight loss or muscle gain programs. It is especially useful for health professionals, nutritionists, and athletes who need a reliable baseline estimate. Remember that BMR is just a starting point; total daily energy expenditure depends on physical activity level (multiplier factor).
Caution: The formula may not be accurate for individuals with atypical body composition, such as athletes with high muscle mass, elderly with sarcopenia, or people with severe obesity. In such cases, methods like bioimpedance or indirect calorimetry are more suitable. Also, the equation was developed for adults aged 19 to 78; for children or pregnant women, other formulas are recommended.
Frequently asked questions
What is BMR and why use the Mifflin-St Jeor formula?
BMR is Basal Metabolic Rate, the calories burned at rest. The Mifflin-St Jeor formula is considered more accurate than Harris-Benedict, based on modern studies.
How do I calculate my total daily energy expenditure from BMR?
Multiply your BMR by an activity factor: sedentary (1.2), light (1.375), moderate (1.55), intense (1.725), or very intense (1.9).
Does the formula work for children or the elderly?
It was developed for adults aged 19 to 78. For children or elderly over 78, other formulas like Schofield or revised Harris-Benedict may be more appropriate.
Does the result change if I have more muscle mass?
Yes, the formula does not account for body composition. Muscular people may have a higher BMR than estimated, and those with low muscle mass, lower.
Can I use this calculator for weight loss?
Yes, but BMR is only the basal expenditure. To lose weight, create a caloric deficit of 300 to 500 kcal/day, always combined with physical activity and professional guidance.