Calculate TDEE

Estimate an adult's resting energy expenditure and a rough daily total for one selected activity scenario.

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ToolTDEE Calculator
Input
Output
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How it works

Mifflin-St Jeor combines kilograms, centimetres, age, and a sex-specific constant to predict resting kcal per day. The chosen activity category multiplies that prediction by 1.2, 1.375, 1.55, 1.725, or 1.9; the two surrounding intake figures are fixed 500 kcal comparisons, not personalised prescriptions.

Formula
resting kcal/day = 10 × kg + 6.25 × cm − 5 × age + sex constant
daily total = resting estimate × activity factor
  • Activity is required because body measurements cannot determine which multiplier represents a normal week.
  • True daily expenditure is better calibrated from repeated food, activity, and body-weight observations than from one equation result.

Worked example

A moderately active adult
30 years old, 180cm, 75kg, training a few times a week
Input
											Age: 30
Height cm: 180
Weight kg: 75
Sex: male
Activity: moderate
Output
												BMR: 1730
TDEE: 2682
Lose weight: 2182
Gain weight: 3182
Activity multiplier: 1.55

When to use this

Dietitians use predicted resting expenditure when indirect calorimetry is unavailable; maintenance-calorie logs and sports nutrition plans then compare the activity scenario with observed training and body-weight trends.

Edge cases

  • An age below 19 or above 78 is rejected because it lies outside the age span reported for the equation's source cohort.
  • Two adults with identical measurements and the same broad activity label receive the same estimate even if their actual daily movement differs.
  • Pregnancy, lactation, fever, injury, metabolic disease, medication, and unusually high muscle mass receive no adjustment, so the output remains a population estimate.

References