🔥 Calorie & TDEE Calculator
Estimate daily maintenance calories for weight loss or muscle gain.
Try the calculator
The values below are a working example. Change any field to recalculate instantly in your browser.
Consult a qualified professional before making major dietary changes.
Formula & Mathematical Logic
BMR = 10 × Weight(kg) + 6.25 × Height(cm) - 5 × Age(y) + s
Computes exact mathematical outputs locally on your device with 0 network latency.
Step-by-Step Worked Example
Sample Scenario
A 25-year-old active male (75 kg, 180 cm) has a BMR of ~1,750 kcal. With moderate exercise, TDEE is ~2,400 kcal/day.
Frequently Asked Questions (FAQ)
How does the Calorie & TDEE Calculator work?
The Calorie & TDEE Calculator applies the mathematical formula BMR = 10 × Weight(kg) + 6.25 × Height(cm) - 5 × Age(y) + s to compute your inputs 100% locally in your web browser.
Is my personal or financial data private?
Yes. Calcixa operates on a 100% privacy-first zero-backend architecture. No data leaves your device.
CALCIXA PRACTICAL GUIDE
How to use the Calorie & TDEE Calculator
This calorie and TDEE calculator estimates resting energy needs and multiplies them by an activity factor to produce an approximate daily maintenance intake. It can be a useful starting point for observing weight trends and planning meals.
Energy expenditure differs between people and changes with body composition, training, sleep, illness, medications, and adaptive responses. Treat the estimate as a hypothesis: compare it with several weeks of consistent intake and weight observations before adjusting.
Step-by-step
- Enter age, sex, height, and weight accurately.
- Choose the activity level that best reflects an average week, not the most active day.
- Calculate estimated maintenance calories and any displayed goal range.
- Monitor real-world trends and make modest adjustments rather than chasing daily scale changes.
How to read the result
- BMR estimates energy used at rest under standardized conditions.
- TDEE applies an activity multiplier to the resting estimate.
- Goal calories are planning estimates and do not guarantee a particular weekly weight change.
Common mistakes to avoid
- Double-counting exercise by choosing a high activity level and adding workout calories again.
- Using an aggressive deficit without professional advice.
- Assuming wearables or equations measure exact energy expenditure.
Important: This educational estimate is not medical advice or a diagnosis.
More questions about Calorie & TDEE Calculator
Why does my weight not follow the estimate exactly?
Water, glycogen, digestion, measurement error, and individual energy expenditure can obscure short-term fat change.
How often should I recalculate?
Recalculate after a meaningful weight or activity change, then validate the new estimate using a multi-week trend.
Is this medical or nutrition advice?
No. It is a general estimate; seek a registered dietitian or clinician for individual guidance.
Sources and methodology
Calcixa explains the model, assumptions, and limitations so you can verify the result. See our calculation and tool methodology for rounding, privacy, testing, and correction practices.
Maintained by the Calcixa product team. This page was last updated on 7 September 2026.