TDEE Calculator
TDEE Calculator multiplies an entered basal metabolic estimate by an activity factor to approximate total daily energy expenditure. The factor compresses exercise, work, movement, and lifestyle into one number, so small selection errors can noticeably change the result. Actual expenditure also varies from day to day and can adapt over time; the estimate is not a guaranteed maintenance intake.
Runs locally — files stay on your deviceHow is TDEE estimated from BMR?
Multiply estimated BMR by the chosen activity factor.
Formula: TDEE = BMR × activity factor
TDEE extends resting expenditure with an activity multiplier
Total daily energy expenditure includes resting metabolism, physical activity, and the thermic effect of food. A simple multiplier approximates these components rather than measuring them separately.
How it works
Enter a BMR estimate and a defensible activity factor. Treat the result as an initial hypothesis and compare it with longer-term observations under professional guidance rather than reacting to single-day scale or activity changes.
Key concepts
Activity categories are broad
People with the same job or training label can have different movement, exercise intensity, body composition, and expenditure.
Maintenance is observed over time
A model provides a starting estimate; individual response and measurement uncertainty remain.
When to use it
- Check the arithmetic of a BMR multiplier model.
- Compare conservative activity-factor scenarios.
- Understand why TDEE is higher than resting expenditure.
When not to use it
- Do not treat a factor as a precise measurement of exercise.
- Do not use the estimate for medical nutrition therapy without professional care.
- Do not infer short-term body-weight change directly from one daily number.
Worked examples
Moderate factor example
- Input
BMR 1,600; factor 1.55- Expected output
Estimated TDEE 2,480 kcal/day
1,600 × 1.55 = 2,480.
Sensitivity to factor
- Input
BMR 1,600; factors 1.4 and 1.6- Expected output
2,240 versus 2,560
A 0.2 factor difference changes the estimate by 320.
Changing training week
- Input
Same factor despite substantially different activity- Expected output
Potentially misleading fixed estimate
Daily and weekly expenditure is not constant.
Common mistakes
Double-counting exercise
An activity factor may already include training before exercise calories are added again. Correction: Use one coherent model.
Choosing a factor by aspiration
Desired activity is not observed activity. Correction: Choose conservatively from actual routine and context.
Treating the estimate as a prescription
Health goals and dietary needs require more than energy arithmetic. Correction: Seek individualized professional advice.
Best practices
- Document the BMR source and factor assumption.
- Use a range of plausible factors.
- Reassess with longer-term observations and qualified guidance.
Related operations and differences
BMR Calculator
Choose BMR Calculator when you need to estimate basal metabolic rate using the Mifflin-St Jeor formula.; use TDEE Calculator specifically for tdee.
BMI Calculator
Choose BMI Calculator when you need to estimate body mass index locally for general information.; use TDEE Calculator specifically for tdee.
Maximum Heart Rate Calculator
Choose Maximum Heart Rate Calculator when you need to estimate maximum heart rate from age for general information.; use TDEE Calculator specifically for tdee.
Running Pace Calculator
Choose Running Pace Calculator when you need to calculate average minutes per kilometer.; use TDEE Calculator specifically for tdee.
Waist-to-Height Ratio Calculator
Choose Waist-to-Height Ratio Calculator when you need to calculate waist circumference divided by height.; use TDEE Calculator specifically for tdee.
Water Intake Calculator
Choose Water Intake Calculator when you need to estimate a simple daily water baseline from body weight.; use TDEE Calculator specifically for tdee.
Limitations and privacy
- This is a population-based estimate for general information, not a diagnosis, treatment plan, or individualized medical or nutrition advice.
- Activity factors are coarse population assumptions.
- The page does not measure movement, digestion, adaptive changes, or medical factors.
Inputs and estimates remain in this browser. Toolbox does not store or transmit these health-related values.
Frequently asked questions
What activity factor should I choose?
Use a conservative factor that reflects actual total activity; categories are broad and imprecise.
Is TDEE my exact maintenance intake?
No. It is an estimate that can differ from actual expenditure and intake needs.
Can I add workout calories to TDEE?
Doing so may double-count activity if the factor already includes exercise.
Why does TDEE change from day to day?
Movement, training, digestion, environment, and physiology vary.