TDEE Calculator
Usage Tips
TDEE Calculator | Maintenance Calories and Activity Multiplier
Estimate total daily energy expenditure, maintenance calories, and fixed calorie deficit or surplus scenarios with metric or imperial inputs.
What is TDEE Calculator?
TDEE means Total Daily Energy Expenditure, an estimate of all the energy you use in a day after basal metabolism, routine movement, work, and exercise are considered. This TDEE calculator first estimates BMR with the Mifflin-St Jeor formula, then multiplies it by the selected activity multiplier to estimate maintenance calories. It also shows fixed maintenance, mild loss, standard loss, mild gain, and standard gain comparison scenarios. Actual daily expenditure changes with steps, training intensity, occupation, sleep, body composition, and health, so the result is a planning baseline rather than a diet prescription or guarantee of weight change.
How to Use
- 1Select sex and enter an adult age from 18 through 120. The calorie comparison scenarios are designed for adults.
- 2Choose a height system and enter centimeters or separate feet and inches values. Inches must be at least 0 and less than 12.
- 3Choose kilograms or pounds and enter current body weight. Pounds are converted to kilograms before calculation.
- 4Select the activity level that best represents a typical week. Consider work, walking, and training rather than only your most active day.
- 5Select Calculate TDEE to see estimated BMR, the chosen activity multiplier, and maintenance calories in kcal/day.
- 6Compare maintenance and fixed ±250 or ±500 kcal/day scenarios with your real trend. Read the warning when a loss scenario falls below estimated BMR and seek professional guidance when appropriate.
Reference Knowledge
- ●The Mifflin-St Jeor BMR formula is 10×weight (kg) + 6.25×height (cm) - 5×age + 5 for men and uses -161 as the final constant for women.
- ●TDEE equals estimated BMR multiplied by an activity factor: sedentary 1.2, light 1.375, moderate 1.55, active 1.725, or very active 1.9.
- ●Activity multipliers are convenient population-level models. They do not precisely measure steps, exercise type, post-exercise energy use, occupational movement, or non-exercise activity.
- ●Maintenance is the calculated TDEE. Loss and gain cards simply subtract or add 250 or 500 kcal/day for comparison.
- ●Compare consistent intake and body-weight trends over several weeks to evaluate a maintenance estimate. Short-term water and glycogen changes can obscure the trend.
- ●CDC guidance emphasizes gradual, sustainable weight-management habits.
- ●The NIDDK Body Weight Planner offers a more detailed way to explore weight and activity changes over time.
- ●The original Mifflin-St Jeor paper describes the resting energy expenditure prediction equation.
FAQ
Q.Are TDEE and maintenance calories the same?
They are commonly used to mean the same thing. TDEE is estimated total daily energy expenditure, and average intake near your actual TDEE may maintain body weight over time. Your calculated and actual maintenance calories can differ.
Q.What is the difference between BMR and TDEE?
BMR estimates energy required for essential functions at complete rest. TDEE adds routine movement and exercise through an activity multiplier, so it is normally higher than BMR.
Q.Which activity multiplier should I choose?
Use a typical recent week and consider job movement, walking, exercise frequency, and intensity. If two levels seem plausible, starting conservatively and comparing the estimate with your real trend can reduce overestimation.
Q.How accurate is a TDEE calculator?
The formula and multipliers are estimates based on population data. Body composition, genetics, hormones, illness, medication, sleep, and activity-reporting error can produce a difference of hundreds of calories from actual expenditure.
Q.How are calorie deficit scenarios calculated?
The calculator subtracts a fixed 250 or 500 kcal/day from estimated maintenance. These are comparison scenarios, not a personalized deficit, expected rate of loss, or clinical recommendation.
Q.What if a loss scenario is below BMR?
The calculator leaves the value visible and shows a warning instead of hiding or adjusting it. Sustained intake below estimated BMR can make adequate nutrition and health management difficult, so seek qualified guidance.
Q.Do the calorie surplus scenarios guarantee muscle gain?
No. The +250 and +500 kcal/day values are simple comparisons. Changes in muscle and fat depend on training, protein and overall nutrition, sleep, recovery, and individual response.
Q.Can I use feet, inches, and pounds?
Yes. Select ft/in and lb. The calculator converts imperial values to centimeters and kilograms before applying the same formula, so equivalent measurements should agree within rounding.
Q.When should I recalculate TDEE?
Recalculate after a meaningful change in weight, body composition, exercise frequency, or occupational activity. You can also compare intake and weight trends over several weeks to assess whether the selected multiplier remains suitable.
Q.Can I use this during pregnancy or with a medical condition?
The calculator does not account for pregnancy, growth, illness, eating disorders, medication effects, or specialist athletic needs. Do not use it as a prescription in these situations; consult a qualified healthcare or nutrition professional.