Mifflin-St Jeor TDEE Calculator

Calculate your Total Daily Energy Expenditure (TDEE) using the highly accurate Mifflin-St Jeor equation.

Basal Metabolic Rate (BMR)2093 kcal/day
Sedentary TDEE2512 kcal/day
Lightly Active TDEE2878 kcal/day
Moderately Active TDEE3244 kcal/day
Very Active TDEE3610 kcal/day
Extra Active TDEE3977 kcal/day

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The Mifflin-St Jeor Equation

The Mifflin-St Jeor equation is widely considered by dietitians and medical professionals to be the most accurate predictive equation for estimating Basal Metabolic Rate (BMR) in modern populations, surpassing the older Harris-Benedict formula.

How It Works

Your BMR is the amount of energy your body burns at complete rest. Once BMR is established, it is multiplied by an Activity Factor (ranging from 1.2 for sedentary individuals to 1.9 for elite athletes) to determine your Total Daily Energy Expenditure (TDEE).

Worked Example (Male)

  1. Weight: 180 lbs (81.6 kg)
  2. Height: 70 inches (177.8 cm)
  3. Age: 30
  4. BMR = (10 * 81.6) + (6.25 * 177.8) - (5 * 30) + 5 = 1,782 kcal/day
  5. If moderately active (1.55), TDEE = 1782 * 1.55 = 2,762 kcal/day.

Frequently Asked Questions

Why is this better than Harris-Benedict?

The Harris-Benedict equation was created in 1919 and tends to overestimate resting metabolic rate by about 5% in modern, more sedentary populations. The Mifflin-St Jeor equation (1990) provides a more accurate baseline.