Total Daily Energy Expenditure Calculator

How to Use the Total Daily Energy Expenditure Calculator

Enter sex, age, height, weight, and activity level to estimate Mifflin–St Jeor BMR and TDEE. Estimates only — not medical advice.

1. Choose metric (cm, kg) or imperial (ft/in, lb).
2. Enter age (15–100 years for this adult estimate), sex, height, and weight.
3. Select the activity level that best matches your typical week.
4. Press Calculate to see estimated BMR and total daily energy expenditure (TDEE).
5. Use Reset to clear the form.

Activity multipliers

• Sedentary (×1.2): little or no exercise.
• Lightly active (×1.375): light exercise about 1–3 days per week.
• Moderately active (×1.55): moderate exercise about 3–5 days per week.
• Very active (×1.725): hard exercise about 6–7 days per week.
• Extra active (×1.9): very hard exercise or a physical job.

Methodology

BMR uses the Mifflin–St Jeor equation from sex, age, height, and weight, rounded to whole kcal/day. TDEE = BMR × the selected activity multiplier.

Worked TDEE calculation example

• User profile: Male, 28 years old, 80 kg, 180 cm tall, office worker exercising 3 times per week (Moderately active).
• Step 1 - BMR: (10 × 80) + (6.25 × 180) − (5 × 28) + 5 = 800 + 1,125 − 140 + 5 = 1,790 kcal/day.
• Step 2 - Activity multiplier: Moderately active factor = 1.55.
• Step 3 - TDEE: 1,790 × 1.55 = 2,774.5 ≈ 2,775 kcal/day.
• Interpretation: 2,775 kcal/day represents caloric equilibrium (weight maintenance). An intake of 2,275 kcal creates a 500 kcal deficit for fat loss, while 3,075 kcal creates a 300 kcal surplus for muscle gain.

Common mistakes

• Choosing activity from one hard workout instead of a typical week.
• Treating TDEE as an exact daily calorie prescription.
• Using this adult estimate outside ages 15–100.

Limitations

Population averages only. Muscle mass, medications, illness, and NEAT can change real expenditure. Not medical advice. For deficit/surplus targets with pace and safety floors, use the Calorie Deficit & Diet Calculator.

Privacy

Inputs stay in your browser. Age, height, weight, and sex are not uploaded to ToolsLibrary servers for this calculator.

FAQ

What is Total Daily Energy Expenditure?

Total daily energy expenditure (TDEE) is an estimate of how many calories you burn in a day, including basic metabolism and your selected activity level. This calculator reports TDEE as BMR × an activity multiplier.

What is BMR?

Basal metabolic rate (BMR) estimates the energy your body needs at rest for basic functions such as breathing and circulation. This tool uses the Mifflin–St Jeor equation, rounded to whole calories per day.

How is total daily energy expenditure calculated?

TDEE = BMR × activity multiplier. BMR comes from the Mifflin–St Jeor equation using sex, age, height, and weight. The activity multiplier depends on the activity level you select (from 1.2 for sedentary to 1.9 for extra active).

What is the difference between BMR and TDEE?

BMR covers resting energy needs only. Total daily energy expenditure (TDEE) adds an activity factor to approximate total daily expenditure. TDEE is typically higher than BMR when any activity beyond rest is selected.

Which activity level should I choose?

Pick the level that best matches your typical week — not a single hard workout. Sedentary is little or no exercise; lightly active is about 1–3 days per week; moderately active 3–5 days; very active 6–7 days; extra active for hard training or a physical job.

Does total daily energy expenditure change with activity?

Yes. This calculator applies a higher multiplier for more active levels, so TDEE increases when you select a more active category, holding BMR constant.

Can total daily energy expenditure be used for weight management?

TDEE is often used as a reference for maintenance calories — approximately the intake that might balance energy in and out. Individual needs vary. For deficit or surplus planning with pace and safety floors, see the Calorie Deficit & Diet Calculator.

How accurate is a total daily energy expenditure estimate?

Equations like Mifflin–St Jeor and activity multipliers are population averages. Muscle mass, genetics, sleep, stress, and daily movement can shift real expenditure. Treat results as estimates, not exact measurements.

What units does the calculator support?

Metric: height in centimeters and weight in kilograms. Imperial: height as feet and inches and weight in pounds. Age is in years (15–100 for this adult estimate).

Can I use TDEE as an exact calorie requirement?

No. TDEE from this tool is an approximate estimate for reference. Real energy needs can differ day to day and person to person. It is not a prescription or medical recommendation.

How often should total daily energy expenditure be recalculated?

Consider recalculating when your weight, activity pattern, or age bracket changes meaningfully, or every few months if you use TDEE for planning. There is no single medical schedule — adjust when your inputs change.