Advanced Calculator
Example Data Table
| Profile | Weight | Activity | Exercise | Estimated TEE | Physics Output |
|---|---|---|---|---|---|
| Office worker | 70 kg | Light | 30 min, 3 days | 2,250 kcal/day | 109 W average |
| Active student | 62 kg | Moderate | 45 min, 4 days | 2,430 kcal/day | 118 W average |
| Endurance athlete | 78 kg | Very active | 75 min, 6 days | 3,650 kcal/day | 177 W average |
Formula Used
Mifflin-St Jeor male: BMR = 10W + 6.25H - 5A + 5
Mifflin-St Jeor female: BMR = 10W + 6.25H - 5A - 161
Revised Harris-Benedict male: BMR = 88.362 + 13.397W + 4.799H - 5.677A
Revised Harris-Benedict female: BMR = 447.593 + 9.247W + 3.098H - 4.330A
Katch-McArdle: BMR = 370 + 21.6 × Lean Body Mass
Exercise energy: kcal = MET × 3.5 × weight kg ÷ 200 × minutes
Total energy expenditure: TEE = BMR × activity + exercise + NEAT + TEF
Energy conversion: 1 kcal = 4.184 kJ. Average power is calculated as joules per day ÷ 86,400 seconds.
How to Use This Calculator
- Select metric or imperial units.
- Enter age, height, weight, sex, and body fat.
- Choose a BMR equation that fits your data.
- Select an activity multiplier for normal daily movement.
- Add exercise MET, session time, and weekly frequency.
- Enter thermic effect, NEAT adjustment, and goal adjustment.
- Press the calculate button to view results above the form.
- Use the CSV or PDF buttons to save your calculation.
Total Energy Expenditure in Physics
Energy Balance
Total energy expenditure describes the energy a body uses in one day. It combines resting metabolism, movement, food digestion, and exercise. In physics, this energy can be shown in calories, kilojoules, megajoules, and watts. Each unit explains the same workload from a different view. Calories are common for nutrition. Joules are standard for physics. Watts show the average power needed across a full day.
Why the Calculation Matters
A person with higher mass usually needs more energy. Taller bodies also need more energy. Age changes the estimate because lean tissue often declines over time. Activity multiplies the resting value. Exercise then adds extra measurable work. The thermic effect of food adds energy used during digestion. This makes the final number more realistic than a simple BMR value.
Physics View of Daily Metabolism
Energy expenditure is not only a diet number. It is a daily power budget. When kilocalories are converted to joules, the body looks like a steady engine. A daily output near 2,400 kcal equals about 10,042 kJ. Spread over 86,400 seconds, it becomes about 116 watts. That is close to a small light bulb, but it runs continuously.
Using Results Wisely
The result is an estimate, not a medical measurement. Real expenditure changes with sleep, stress, temperature, training, and hormones. Track body weight, performance, and hunger for two to four weeks. Then adjust calories slowly. Small changes are easier to follow. They also reduce error. Use the target calories as a starting point. Use the energy units to understand the physical scale behind daily movement and body maintenance.
FAQs
1. What is total energy expenditure?
It is the total energy your body uses each day. It includes resting metabolism, activity, exercise, digestion, and small lifestyle movements.
2. Is TEE the same as BMR?
No. BMR is resting energy use. TEE includes BMR plus daily movement, planned exercise, digestion, and other adjustments.
3. Which formula should I choose?
Mifflin-St Jeor is a strong general choice. Katch-McArdle is useful when body fat percentage is known. Custom BMR fits lab-tested values.
4. What does MET mean?
MET means metabolic equivalent. It compares activity intensity with resting energy use. Higher MET values mean more energy is burned per minute.
5. Why does the calculator show watts?
Watts show average power. The calculator converts daily calories into joules, then divides by seconds in a day.
6. What is thermic effect of food?
It is energy used to digest and process food. Many estimates use about ten percent, but the value can vary by diet.
7. Can I use this for weight loss?
Yes. Enter a negative goal adjustment to create a calorie deficit. Start with a moderate deficit and track progress carefully.
8. Can I save the results?
Yes. After calculation, use the CSV button for spreadsheet data or the PDF button for a printable report.