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Thermic Effect of Food Calculator

Enter the calories eaten and TEF percentage to get the thermic effect of food.

Result

288 kcal

How it is calculated

The result is one percentage of the calories you ate: TEF (kcal) = calories × TEF% ÷ 100. Calories is the energy eaten in kcal, usually for a day, and TEF% is the share of that energy the body spends on digestion and absorption. If you leave TEF% empty the tool assumes 10%. The answer is rounded to a whole kcal. Calories and the percentage cannot be negative, and the tool does not limit the percentage to a realistic range, so a value like 120 is accepted and gives more than you ate. The figure is a single average for the whole meal or day. Different macronutrients have different percentages, so for a diet with unusual protein intake adjust the percentage yourself.

Worked example

A day with 2,400 kcal eaten and a TEF of 12%. Convert the percentage: 12 ÷ 100 = 0.12. Multiply: 2,400 × 0.12 = 288 kcal. This means 288 of the 2,400 kcal are used up by digestion, leaving 2,112 kcal of net energy. With the default 10% the same day would give 240 kcal.

Try this example →

Common mistakes

  • Entering the percentage as a decimal. Type 12 for 12%, not 0.12, or the result comes out 100 times too small.
  • Entering the weight of food or the grams of protein in the calories field. The field is energy in kcal.
  • Applying one percentage to every meal type. Protein, carbohydrate and fat differ, so a high-protein day justifies a higher percentage than a high-fat day.
  • Treating the result as extra calories burned on top of everything. It is already part of your daily energy use, alongside resting metabolism and activity, so do not add it again to a total that already includes it.
  • Expecting a precise personal value. TEF varies between people and meals, and the default of 10% is a rough average.

Sources

About this calculator

This calculator computes the thermic effect of food (TEF) — also called diet-induced thermogenesis — the energy your body spends digesting, absorbing and metabolizing what you eat, calculated as a percentage of calories consumed. It varies by macronutrient: protein has by far the highest TEF (about 20–30% of its calories), carbohydrates around 5–10%, and fat only about 0–3%, so a mixed diet averages out to roughly 10%.

TEF is one of the three components of total daily energy expenditure alongside basal metabolic rate and physical activity, and it's a key reason nutritionists recommend higher-protein diets for weight management — not only does protein feel more satiating, it also burns more calories just being processed.

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