Estimates your Total Daily Energy Expenditure from your BMR and activity level.
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Calculation basis and official references
Reviewed on:
This calculator is not a diagnosis, treatment plan, or prescription. Please consult a qualified clinician about your medical decisions.
Formula basis
TDEE (kcal/day) = BMR (kcal/day) x activity factor. BMR uses the same equation as the BMR calculator (men: 13.397W + 4.799H - 5.677A + 88.362; women: 9.247W + 3.098H - 4.33A + 447.593). Activity factor: sedentary = 1.2, light exercise = 1.375, moderate = 1.55, hard exercise = 1.725, very hard = 1.9.
Calculation method
Estimates Total Daily Energy Expenditure (TDEE) by multiplying your basal metabolic rate (revised Harris-Benedict equation) by an activity-level factor (1.2 to 1.9) that reflects your typical daily activity.
Exclusions and checks required
The five-tier activity factor scale (1.2-1.9) is a widely used convention in Western fitness and nutrition guidance, not a value fixed by a single peer-reviewed paper or government standard (no single primary academic source could be confirmed; see open questions).
The BMR component is an estimate from the Roza & Shizgal (1984) regression equation, not a measured value from indirect calorimetry.
Actual energy expenditure varies day to day with body composition, ambient temperature, and non-exercise daily activity (NEAT).
Example input:：A 25-year-old man, 180 cm tall, 80 kg, with hard exercise (x1.725)
age
25
sex
Male
height
180
weight
80
activity
Hard exercise x1.725
TDEE is a mechanical estimate from BMR and an activity factor; the result changes substantially depending on which activity factor you choose.
Estimates your Total Daily Energy Expenditure from your BMR and activity level.
What values should I enter?
Applies to: Body & metabolism
How should I interpret this estimate?
Estimates Total Daily Energy Expenditure (TDEE) by multiplying your basal metabolic rate (revised Harris-Benedict equation) by an activity-level factor (1.2 to 1.9) that reflects your typical daily activity.
How to use
Enter your input values and press Calculate.
Review the result and compare it with expected context.
TDEE (kcal/day) = BMR (kcal/day) x activity factor. BMR uses the same equation as the BMR calculator (men: 13.397W + 4.799H - 5.677A + 88.362; women: 9.247W + 3.098H - 4.33A + 447.593). Activity factor: sedentary = 1.2, light exercise = 1.375, moderate = 1.55, hard exercise = 1.725, very hard = 1.9.