TDEE Calculator
Estimate your Total Daily Energy Expenditure — the approximate amount of energy your body uses in a day. Calculate BMR from age, sex, height and weight, then apply an activity level, or enter a known BMR directly.
Calculate Your TDEE
Choose whether you want ToolZippy to estimate your BMR first or whether you already know your BMR.
How to Use the TDEE Calculator
- Select Calculate from My Details if you want the calculator to estimate your BMR first.
- Choose Metric or US units and enter your age, sex, weight and height.
- Select the activity level that most closely describes your usual routine.
- Select Calculate TDEE to see the estimated BMR and daily energy expenditure.
If you already know your BMR, choose I Know My BMR, enter that value and select an activity level. The calculator will then apply the selected activity factor directly.
What Is TDEE?
TDEE stands for Total Daily Energy Expenditure. It is an estimate of the total energy your body uses over a day. It includes the energy required for basic body functions plus the energy associated with movement and activity.
TDEE is often estimated by first calculating basal metabolic rate and then multiplying that value by an activity factor.
TDEE ≈ BMR × Activity Factor
The activity multiplier is a broad approximation. Two people assigned the same activity category can still have different actual energy expenditure.
How BMR Is Estimated
When you choose to calculate from your details, this tool uses the Mifflin–St Jeor equation to estimate basal metabolic rate from weight, height, age and the sex constant used by the equation.
BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5
BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161
BMR represents an estimate of energy expenditure at rest. It is not the same as TDEE because normal daily life involves movement and activity beyond basal needs.
TDEE Activity Factors
After estimating BMR, the calculator applies the activity factor you select. These categories are intentionally broad and should not be interpreted as precise measurements of physical activity.
| Activity Level | Factor | General Description |
|---|---|---|
| Sedentary | 1.20 | Little or no structured exercise. |
| Lightly active | 1.375 | Light exercise approximately 1–3 days per week. |
| Moderately active | 1.55 | Moderate exercise approximately 3–5 days per week. |
| Very active | 1.725 | Hard exercise approximately 6–7 days per week. |
| Extra active | 1.90 | Very hard exercise or a demanding physical routine. |
Exercise frequency alone does not fully describe energy expenditure. Occupation, walking, household activity, training duration, exercise intensity and individual physiology can all affect real-world energy use.
Understanding Your TDEE Result
The number displayed by the calculator is an estimate of daily energy expenditure based on the formula and activity category selected. It is not a direct measurement of your metabolism.
Actual daily expenditure can vary because activity is not identical every day. Sleep, movement, training, body composition, environmental conditions, physiology and other factors may also contribute to differences between a calculated estimate and real-world energy use.
Why the calculator also shows BMR
Showing BMR separately makes the calculation easier to understand. You can see the estimated resting value before the activity multiplier is applied rather than receiving only one unexplained calorie number.
Why a weekly number is shown
The seven-day figure is simply the calculated TDEE multiplied by seven. It provides another way to view the estimate; it does not mean that your actual expenditure will be identical on every day of the week.
Why Your Actual TDEE May Be Different
TDEE equations are useful estimation methods, but they cannot directly measure the energy expenditure of an individual. The result can differ from real-world expenditure for several reasons.
- Activity categories combine many different routines into broad groups.
- Body composition can differ between people with similar height and weight.
- Exercise intensity and duration vary considerably.
- Daily walking and non-exercise movement can change from one day to another.
- BMR equations estimate resting energy rather than directly measuring it.
- Individual physiology and some health-related factors can affect energy expenditure.
For this reason, a TDEE calculator is better understood as a starting estimate rather than a guarantee of an individual’s exact calorie needs.
Important Health & Nutrition Note
This TDEE Calculator is intended for general informational and educational use. It is not medical advice and does not diagnose, treat or prevent any condition. Do not use an online calorie estimate as the sole basis for medical treatment, pregnancy-related nutrition decisions, eating-disorder management, medication changes or another high-stakes health decision. Appropriate professional guidance may be needed for individual nutrition or health requirements.
TDEE Calculator FAQs
What does TDEE mean?
TDEE means Total Daily Energy Expenditure. It is an estimate of the total energy your body uses during a day.
How does this TDEE Calculator work?
The calculator can estimate BMR using the Mifflin–St Jeor equation and then multiply that BMR by the activity factor you select. You can also enter a known BMR directly.
What is the difference between BMR and TDEE?
BMR estimates energy expenditure at rest. TDEE applies an activity multiplier to BMR to estimate broader daily energy expenditure.
Is TDEE the same as the exact number of calories I need?
No. TDEE is an estimate. Actual energy expenditure varies between people and can also vary from day to day.
Which BMR formula does this calculator use?
When calculating BMR from age, height and weight, ToolZippy uses the Mifflin–St Jeor equation.
Can I enter my own BMR?
Yes. Select “I Know My BMR,” enter your BMR in kcal per day and choose an activity level.
Can I use pounds and feet instead of kilograms and centimeters?
Yes. Select US Units to enter weight in pounds and height in feet and inches. The calculator converts those measurements internally before applying the BMR equation.
Which activity level should I choose?
Choose the category that most closely reflects your usual routine. Activity factors are broad estimates, so they cannot capture every difference in occupation, walking, exercise intensity or daily movement.
Why might my actual energy expenditure differ from the result?
The calculation uses population-based equations and broad activity multipliers. Body composition, movement, exercise, physiology and other individual factors can cause real-world expenditure to differ.
Is this TDEE Calculator medical advice?
No. It is a general informational estimation tool and should not replace individual medical, nutrition or other qualified professional advice when such guidance is appropriate.