Thermic Effect of Food Calculator
Energy spent digesting — TEF from your macro mix using published per-macronutrient ranges, not a flat 10% guess.
Protein is metabolically expensive to process (20–30% of its energy), carbohydrate moderate (5–10%), fat cheap (0–3%) — so two diets with identical calories can differ by 50–100 kcal/day in digestion cost alone. The mid-range coefficients here come from the Westerterp review.
Formula
For general information only — not medical advice, a diagnosis or a treatment plan. Consult a qualified healthcare professional before making health, diet, medication or exercise decisions.
Energy spent digesting — TEF from your macro mix using published per-macronutrient ranges, not a flat 10% guess. The Thermic Effect of Food Calculator is a free, private thermic effect of food tool — every result computes instantly in your browser with no sign-up and no data upload.
About Thermic Effect of Food Calculator
Protein is metabolically expensive to process (20–30% of its energy), carbohydrate moderate (5–10%), fat cheap (0–3%) — so two diets with identical calories can differ by 50–100 kcal/day in digestion cost alone. It applies TEF ≈ 25% of protein kcal + 7.5% of carb kcal + 2% of fat kcal. Use the Thermic Effect of Food Calculator to get an instant, clearly-explained result with the working shown step by step — free, private and with the source method cited.
How to use Thermic Effect of Food Calculator
- 1Enter your details in the Thermic Effect of Food Calculator input fields above.
- 2The result updates instantly with the working and reference bands shown.
- 3Adjust any value to explore how it changes the outcome — it's free and unlimited.
Why use Thermic Effect of Food Calculator?
- ✓Instant thermic effect of food result that recomputes as you type — no waiting, no page reloads
- ✓100% client-side: your health data never leaves your browser
- ✓Shows the actual formula and your numbers substituted in, so you can see exactly how the result is reached
- ✓Based on published, citable sources (Westerterp KR, Nutr Metab 2004 — diet induced thermogenesis)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the Thermic Effect of Food Calculator work?+
Protein is metabolically expensive to process (20–30% of its energy), carbohydrate moderate (5–10%), fat cheap (0–3%) — so two diets with identical calories can differ by 50–100 kcal/day in digestion cost alone. The calculation uses the formula: TEF ≈ 25% of protein kcal + 7.5% of carb kcal + 2% of fat kcal. Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the Thermic Effect of Food Calculator accurate, and what is it based on?+
The method is traceable to authoritative sources: Westerterp KR, Nutr Metab 2004 — diet induced thermogenesis. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the Thermic Effect of Food Calculator free and private?+
Yes. It's completely free with no sign-up, and all computation happens locally in your browser, so none of your health data ever leaves your device.
Can I use this for medical decisions?+
This tool is for general information only and is not medical advice. Always consult a qualified healthcare professional before making health decisions.
What can I use the Thermic Effect of Food Calculator for?+
It's commonly used for thermic effect of food, tef calculator, diet induced thermogenesis. Energy spent digesting — TEF from your macro mix using published per-macronutrient ranges, not a flat 10% guess.
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