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Basics

How TDEE is calculated

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How TDEE is calculated

Most online calorie calculators run the same 1990 formula, then multiply it by a guess about how active you are, and that guess drives most of the difference between them.

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What TDEE is made of

TDEE , total daily energy expenditure, is the calories you burn in a day.

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The two main formulas

Mifflin-St Jeor (1990), using weight in kg, height in cm and age in years: Men: 10 x weight + 6.25 x height - 5 x age + 5 Women: 10 x…

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Activity multipliers

Level Description Multiplier Sedentary Desk job, little exercise 1.2 Lightly active Light exercise 1 to 3 days a week 1.375 Moderately…

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A worked example

A 40-year-old woman, 5 ft 5 in (165 cm) and 180 lb (81.6 kg): BMR = 10 x 81.6 + 6.25 x 165.1 - 5 x 40 - 161 = about 1,487 calories…

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Why calculators disagree

Studies comparing Mifflin-St Jeor with measured resting energy found it was usually within about 10% for most people, but less accurate for…

Want the full picture?

How total daily energy expenditure is estimated: Mifflin-St Jeor and Katch-McArdle, activity multipliers, a worked example and why calculators disagree.

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