TDEE Calculator
Estimate total daily energy expenditure (TDEE) by combining a Mifflin-St Jeor resting-energy estimate with a broad activity multiplier. TDEE is useful for understanding the difference between resting energy and an estimate of total daily expenditure, but it is not a direct metabolic measurement and should not be treated as a medical or nutrition prescription.
Estimated TDEE = Mifflin-St Jeor resting-energy estimate × selected activity multiplier.
Activity multipliers are broad planning assumptions rather than direct measurements of individual energy expenditure.
How to use the TDEE Calculator
- Enter adult age, height and weight and choose the sex-specific equation constant.
- The Mifflin-St Jeor equation estimates resting energy expenditure.
- Choose an activity level ranging from sedentary to extra active.
- The calculator multiplies estimated resting energy by the selected activity factor.
- The resulting TDEE represents an approximate daily energy expenditure under the entered assumptions.
- A weekly equivalent is shown for mathematical context, but actual expenditure varies from day to day.
Examples
Moderately active example
An estimated resting expenditure of 1,600 kcal multiplied by 1.55 produces an estimated TDEE of 2,480 kcal/day.
Sedentary example
The same 1,600 kcal resting estimate multiplied by 1.2 gives an estimated TDEE of 1,920 kcal/day.
Why two people can differ
People with the same body weight can receive different estimates because age, height, equation sex constant and selected activity assumptions also affect the calculation.
Frequently asked questions
What does TDEE mean?
TDEE means total daily energy expenditure. It is an estimate of the total energy used during a day, including resting needs and activity.
How is TDEE calculated here?
The calculator estimates resting energy with the Mifflin-St Jeor equation and multiplies it by the selected activity factor.
Is TDEE the same as BMR?
No. BMR or resting-energy estimates represent energy used at rest, while TDEE attempts to account for activity as well.
Are activity multipliers exact?
No. They are broad planning assumptions. Activity can vary greatly between individuals and from one day to another.
Can TDEE be measured directly?
Energy expenditure can be assessed using specialized methods, while online calculators provide predictions based on equations and assumptions.
Does this calculator prescribe how much I should eat?
No. It provides a general educational estimate of energy expenditure and is not individualized nutrition or medical advice.
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