Calculator Input Panel
The page stays single-column, while the form grid becomes three columns on large screens.
Formula Used
MET model: kcal = METeff × body mass(kg) × time(hr)
Power model: kcal = [Power(W) × time(s)] ÷ [4184 × efficiency]
Work model: kcal = [Force(N) × distance(m)] ÷ [4184 × efficiency]
Hybrid model: kcal = [resting term + external work term] × adjustment factor
The adjustment factor equals (1 + load%) × (1 + ambient%) after converting percentages to decimals.
One nutritional calorie equals 4184 joules, so physics-based work can be converted into an energy estimate.
Net active calories are shown as gross calories minus the resting baseline over the same time period.
How to Use This Calculator
- Select the model that best fits your task data.
- Enter body weight and total activity duration.
- Choose an activity preset or type a custom MET.
- Add power, force, and distance when using engineering-based methods.
- Set mechanical efficiency to reflect real-world movement losses.
- Apply load and ambient adjustments for tougher working conditions.
- Press calculate to view metrics, graph, and export buttons.
Example Data Table
These rows show example scenarios and representative outputs.
| Scenario | Method | Inputs | Estimated Calories |
|---|---|---|---|
| Manual Material Handling | MET | 78 kg, 45 min, MET 6.5 | 380.25 kcal |
| Cycle Ergometer Session | Power | 72 kg, 30 min, 150 W, 24% efficiency | 268.88 kcal |
| Repeated Push/Pull Cycle | Work | 85 kg, 25 min, 350 N, 1200 m, 25% efficiency | 401.53 kcal |
| Loaded Stair Climb | Hybrid | 82 kg, 20 min, 220 W, load +8%, resting MET 1.2 | 320.49 kcal |
Frequently Asked Questions
1. Which method should I choose?
Use the MET model when you know the activity intensity. Use the power or work models when you have engineering measurements. Use the hybrid model when you want a resting baseline plus measured external work.
2. What does mechanical efficiency mean here?
Mechanical efficiency represents how much metabolic energy becomes useful external work. Lower efficiency means the body spends more calories to produce the same physical output.
3. Why are gross and net calories both shown?
Gross calories estimate the total expenditure during the task. Net active calories subtract the resting baseline, which helps compare the extra energy cost created by the activity itself.
4. Can I use pounds, feet, and pounds-force?
Yes. The calculator converts pounds to kilograms, feet to meters, and pounds-force to newtons internally before applying the selected formula.
5. What do the load and ambient adjustments change?
They scale the final estimate to reflect additional carried mass, thermal burden, ventilation issues, or other field conditions that raise or lower actual energy expenditure.
6. Why is the chart cumulative instead of instantaneous?
Cumulative calories are easier to compare across durations and export to reports. The graph assumes the activity remains fairly steady throughout the selected time interval.
7. Is this suitable for medical or dietary treatment?
It is best used for estimation, planning, and comparative analysis. Medical nutrition decisions should use clinical assessment, direct measurement, or professional guidance.
8. What does the PDF and CSV export include?
Both exports include the current calculation summary. The CSV also includes the cumulative minute-by-minute chart data, while the PDF provides a concise report snapshot.