Thermic Effect of Food Calculator
See how many calories digesting food burns — 10% of daily intake on average, with a macro-based estimate for any meal.
Total calories eaten in a day — e.g. 2000.
TEF at 10%
200 kcal
Energy burned digesting food
Low estimate (5%)
100 kcal
High estimate (15%)
300 kcal
TEF is the energy used to digest, absorb and process food — roughly 10% of intake, typically 5-15% depending on what you eat.
Thermic Effect of Food Calculator on True Calculator gives you an instant, accurate answer with no sign-up and no app install. See how many calories digesting food burns — 10% of daily intake on average, with a macro-based estimate for any meal. Every result shows the formula and a worked example so you can verify the calculation yourself, and all values are computed in your own browser — your numbers never leave your device.
Popular uses: thermic effect of food calculator · tef calculator · food digestion calories
Reviewed by the True Calculator team · Last updated: August 2026
How We Calculate
This calculator uses medically reviewed formulas verified by our team. All calculations are performed instantly in your browser using JavaScript — no data is sent to any server.
We use WHO-recommended formulas and medical standards for health calculations. Results are estimates, not medical advice — always consult a doctor for health decisions.
When to Use This Calculator
The thermic effect of food is the quiet piece of the energy equation that dieters and sports nutritionists use to compare meals rather than chase big numbers. Anyone managing weight uses it to understand why a protein-and-vegetable meal and a fried-snack meal of equal calories feel different — the protein version costs more energy to process and keeps hunger away longer. Bodybuilders planning meals around training use the macro mode to shift energy from fat toward protein without changing the plate's total much. Nutrition students use it to connect macronutrient metabolism to real numbers, and coaches use it to explain why a high-protein, vegetable-rich diet supports fat loss even at equal calories. It is a tool for meal design, not an excuse to eat more — the effect is real but modest.
How to Use This Calculator
- Step 1: Choose a method — by total daily calories, or by the macros of a specific meal.
- Step 2: For the standard method, enter your daily calorie intake; for the macro method, enter protein, carbs and fat in grams.
- Step 3: Read the TEF in kcal — roughly 10% of intake in the standard view.
- Step 4: In macro mode, note how protein dominates the digestion cost even when it is a minority of the meal.
Worked Example
On a 2,000 kcal day, the standard method reports a TEF of 200 kcal — the energy burned digesting that intake — with a low estimate of 100 kcal (5%) and a high estimate of 300 kcal (15%). A meal of 100 g protein, 200 g carbs and 70 g fat contains 1,830 kcal: 400 + 800 + 630. Its TEF is 25% of 400 plus 7% of 800 plus 3% of 630, which is 100 + 56 + 18.9 = 174.9 kcal, about 9.56% of the meal. Swap 20 g of fat for 20 g of protein and the digestion cost rises noticeably while total calories change only modestly.
Tips and Common Mistakes
- •Tip 1: Use TEF to compare meal compositions, not to justify extra portions — the effect is single-digit to low double-digit kcal.
- •Tip 2: Prioritise protein at every meal; it is both the most thermogenic macro and the most satiating.
- •Tip 3: Remember TDEE formulas already embed TEF — do not add it again to a maintenance budget.
- ✗Mistake 1: Believing high-protein food is 'free' — it still has calories, just a slightly higher processing cost.
- ✗Mistake 2: Applying fixed percentages to irregular eating; TEF scales with the actual meal size and composition.
Frequently Asked Questions
What is the thermic effect of food?
TEF is the energy your body spends digesting, absorbing and processing what you eat — roughly 10% of daily calorie intake, with a typical range of 5-15%. A 2,000 kcal day therefore burns about 200 kcal on digestion alone.
Why does protein burn more than fat when digested?
Protein is the most thermogenic macronutrient — about 25% of its energy is used up processing it — followed by carbohydrates at about 7% and fat at about 3%. This is because protein synthesis, deamination and urea production are energy-hungry processes.
Does TEF mean I can eat more without gaining weight?
Only marginally. A high-protein meal raises TEF by tens of calories, not hundreds — nowhere near enough to offset overeating. Protein's bigger weight-management advantage is satiety: it keeps you full longer, so you naturally eat less later.
How is TEF measured?
In research, TEF is measured by comparing oxygen consumption before and after a meal in a metabolic chamber or with indirect calorimetry. Population values like the 25%, 7% and 3% used here are mid-point estimates from aggregate studies — individual values vary.
Do spices and chillies increase TEF?
Studies suggest capsaicin from chillies can modestly raise post-meal energy expenditure for a short time, but the effect is small and temporary. It may help by curbing appetite as much as by burning calories — and the effect fades as tolerance builds.
Should TEF be added to my calorie budget?
Standard TDEE formulas already include TEF inside their estimates, so don't add it on top or you will double-count. The useful insight from this calculator is comparative: swap some fat calories for protein and the same meal costs more energy to process.
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