TDEE Calculator

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TDEE and total daily energy expenditure

TDEE: How the Activity Factor Multiplies BMR

TDEE is the total energy expenditure of a full day: basal metabolic rate plus everything the body spends on movement, digestion and work. The formula is a simple multiplication, but the number that feeds into it, the activity factor, is where nearly all the error in the estimate lives.

A Fixed Multiplier on an Already-Estimated Number

TDEE = BMR × activity factor, with five fixed factors: sedentary 1.2, lightly active 1.375, moderately active 1.55, active 1.725, and very active 1.9. For a BMR of 1650 kcal (the 175 cm, 70 kg man example calculated with Mifflin-St Jeor), the sedentary factor gives a TDEE of 1980 kcal, and the moderate factor gives 2558 kcal, for the exact same person on paper, just changing how active they report being.
The calculator returns a range alongside the central number, 10% below and 10% above the calculated TDEE, acknowledging that both BMR and the activity factor already carry their own uncertainty before being multiplied together. For the moderate example (2558 kcal), the range runs from 2302 to 2813 kcal; for the sedentary one (1980 kcal), from 1782 to 2178 kcal.
The real trap in TDEE is not in BMR or the multiplication, it is in the choice of activity category, which is self-reported and categorical, not measured. For the same 1650 kcal BMR, the gap between classifying as sedentary (1980 kcal) and moderately active (2558 kcal) is 578 kcal, larger than the ±10% range around either number on its own. One wrong category step weighs more on the final result than any imprecision from the chosen BMR formula.

The Same BMR, Three Categories

Sedentary: 1650 kcal BMR, 1.2 factor

Input: TMB 1650, fator sedentário 1,2
Expected output: TDEE ≈ 1980 kcal (faixa 1782 a 2178)

1650 × 1.2 = 1980; the ±10% range covers 1782 to 2178 kcal, acknowledging the combined uncertainty of BMR and factor together.

Moderately active: same BMR, 1.55 factor

Input: TMB 1650, fator moderado 1,55
Expected output: TDEE ≈ 2558 kcal (faixa 2302 a 2813)

1650 × 1.55 = 2557.5, rounded to 2558; the only variable that changed from the previous example was the declared activity category.

Difference from category alone, same person

Input: sedentário (1980 kcal) vs moderado (2558 kcal)
Expected output: 578 kcal de diferença, sem mudar TMB

This 578 kcal gap is larger than the ±10% range of either result on its own, which shows the chosen category weighs more than the margin of error already built into the formula itself.

Full tool FAQ

Is TDEE my calorie target?

Not necessarily. It is a maintenance estimate. Goals depend on health, objective, history and professional support.

Which activity level should I choose?

Why show a ±10% range?

Does body composition make TDEE exact?

Is the data private?

Does TDEE change with weight loss?

Do steps count as activity?

Why not only use a smartwatch?

Is this for teenagers?

Is TDEE the same every day?

Frequently asked questions

Does TDEE include BMR calories or is it on top of them?

It includes it. TDEE is BMR multiplied by the activity factor, so the resting expenditure is already folded into the final number; there is no need to add BMR again on top of TDEE.

Why does the TDEE calculator show a range instead of a single fixed number?

Because TDEE is the product of two estimates, BMR and the activity factor, and both carry their own imprecision. The 10% range below and above the central value exists so the tool does not present a single number as if it were an exact measurement.

Which activity factor should I pick if I only exercise twice a week?

That usually falls between "lightly active" (1.375 factor, light exercise 1 to 3 days a week) and "sedentary" (1.2 factor, little to no exercise), depending on intensity and the rest of your daily routine. Since the gap between adjacent categories already weighs hundreds of calories, it is worth picking the more conservative one when in doubt.

Is TDEE the amount of calories I should eat?

TDEE is an expenditure estimate, not a diet prescription. It is a reference number for understanding maintenance, surplus or deficit; any decision about how much to eat, in any health context, belongs with professional guidance, not this calculation alone.

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TDEE and total daily energy expenditure

TDEE: How the Activity Factor Multiplies BMR

A Fixed Multiplier on an Already-Estimated Number

TDEE = BMR × activity factor, with five fixed factors: sedentary 1.2, lightly active 1.375, moderately active 1.55, active 1.725, and very active 1.9. For a BMR of 1650 kcal (the 175 cm, 70 kg man example calculated with Mifflin-St Jeor), the sedentary factor gives a TDEE of 1980 kcal, and the moderate factor gives 2558 kcal, for the exact same person on paper, just changing how active they report being.

The calculator returns a range alongside the central number, 10% below and 10% above the calculated TDEE, acknowledging that both BMR and the activity factor already carry their own uncertainty before being multiplied together. For the moderate example (2558 kcal), the range runs from 2302 to 2813 kcal; for the sedentary one (1980 kcal), from 1782 to 2178 kcal.

The real trap in TDEE is not in BMR or the multiplication, it is in the choice of activity category, which is self-reported and categorical, not measured. For the same 1650 kcal BMR, the gap between classifying as sedentary (1980 kcal) and moderately active (2558 kcal) is 578 kcal, larger than the ±10% range around either number on its own. One wrong category step weighs more on the final result than any imprecision from the chosen BMR formula.

The Same BMR, Three Categories

Sedentary: 1650 kcal BMR, 1.2 factor

Input: TMB 1650, fator sedentário 1,2
Expected output: TDEE ≈ 1980 kcal (faixa 1782 a 2178)

1650 × 1.2 = 1980; the ±10% range covers 1782 to 2178 kcal, acknowledging the combined uncertainty of BMR and factor together.

Moderately active: same BMR, 1.55 factor

Input: TMB 1650, fator moderado 1,55
Expected output: TDEE ≈ 2558 kcal (faixa 2302 a 2813)

1650 × 1.55 = 2557.5, rounded to 2558; the only variable that changed from the previous example was the declared activity category.

Difference from category alone, same person

Input: sedentário (1980 kcal) vs moderado (2558 kcal)
Expected output: 578 kcal de diferença, sem mudar TMB

This 578 kcal gap is larger than the ±10% range of either result on its own, which shows the chosen category weighs more than the margin of error already built into the formula itself.

Full tool FAQ

Is TDEE my calorie target?

Not necessarily. It is a maintenance estimate. Goals depend on health, objective, history and professional support.

Which activity level should I choose?

Why show a ±10% range?

Does body composition make TDEE exact?

Is the data private?

Does TDEE change with weight loss?

Do steps count as activity?

Why not only use a smartwatch?

Is this for teenagers?

Is TDEE the same every day?

Frequently asked questions

Does TDEE include BMR calories or is it on top of them?

It includes it. TDEE is BMR multiplied by the activity factor, so the resting expenditure is already folded into the final number; there is no need to add BMR again on top of TDEE.