How to Calculate Your TDEE

TDEE (Total Daily Energy Expenditure) represents the total number of calories your body burns in a day. It is the cornerstone of any nutritional strategy: without knowing this number, it's impossible to know how much to eat to lose weight, gain it, or maintain your current shape. This guide explains how to calculate it precisely and use it daily.

Steps

1

Determine Your Basal Metabolic Rate (BMR)

BMR represents the energy your body consumes at complete rest. Use the Harris-Benedict or Mifflin-St Jeor formula by entering your weight, height, age, and gender. For an 80 kg, 180 cm, 30-year-old male, the Mifflin formula gives about 1 800 kcal.

2

Assess Your Physical Activity Level

Be honest about your actual activity, not what you'd like it to be. Sedentary means an office job with no exercise. Moderately active corresponds to 3-5 workout sessions per week. Most people overestimate their activity level.

3

Apply the Corresponding Multiplier

Multiply your BMR by the activity factor: 1.2 (sedentary), 1.375 (lightly active), 1.55 (moderately active), 1.725 (very active), or 1.9 (extremely active). A BMR of 1 800 kcal with a factor of 1.55 gives a TDEE of approximately 2 790 kcal.

4

Adjust Based on Your Goal

To lose weight, subtract 300 to 500 kcal from your TDEE. To gain mass, add 200 to 400 kcal. A deficit that is too aggressive (more than 700 kcal) slows down the metabolism and causes cravings — it's better to go gradually.

5

Track Your Results for 2 Weeks

Weigh yourself under the same conditions every morning and note the weekly average. If your weight doesn't move after 2 weeks at "maintenance", your TDEE is correct. If you lose or gain weight, adjust by 100-200 kcal.

6

Use a Calculator to Save Time

Manual formulas work, but an automated calculator prevents rounding errors and compares multiple formulas instantly. The key is to understand the logic behind the number, then let the tool do the math.

What is TDEE and Why It Matters

TDEE combines your Basal Metabolic Rate (BMR), the thermic effect of food (about 10 % of calories ingested), and energy expended through physical activity. It is your actual daily calorie budget. Knowing this number allows you to eat exactly what you need — not too much, not too little. Without a reliable TDEE, counting calories is like navigating without a compass. It is also the basis for calculating your macros and planning your meals consistently.

The Formulas: Harris-Benedict vs. Mifflin-St Jeor

The Harris-Benedict formula, created in 1919, was revised in 1984 by Roza and Shizgal. It remains reliable but tends to slightly overestimate needs. The Mifflin-St Jeor formula (1990) is now considered the most accurate for the general population. For men: (10 x weight in kg) + (6.25 x height in cm) - (5 x age) + 5. For women: the same formula but -161 instead of +5. Both provide a BMR which must then be multiplied by the activity factor.

Common Errors to Avoid

The number one mistake is overestimating your activity level: 3 sessions of 45 minutes per week puts you at "lightly active", not "very active". Second pitfall: using TDEE as a fixed number when it fluctuates based on season, stress, and sleep quality. Third error: applying a deficit that is too brutal, which triggers metabolic compensation mechanisms. Adjust gradually and observe the results over 2-3 weeks before changing anything.

FoodCraft Tip

Integrated TDEE Calculator

The FoodCraft TDEE calculator compares Harris-Benedict and Mifflin-St Jeor results side-by-side, with your activity factor already applied. You get a figure in 30 seconds, without taking out the calculator.

From TDEE to Meal Planning

Once your TDEE is calculated, the FoodCraft AI planner uses it directly to generate a week of calibrated meals. Each day respects your calorie target while varying cuisines and flavors.

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Frequently Asked Questions

What's the difference between TDEE and BMR?
BMR is the energy you burn at total rest (vital functions only). TDEE includes BMR plus the energy from digestion and all physical activity. TDEE is always higher than BMR — usually by 20 to 80 % depending on your activity level.
Does my TDEE change over time?
Yes. TDEE evolves with age, weight variations, muscle mass, and activity level. Recalculate it every 2-3 months or after a significant weight change (5 kg or more).
Which formula is the most reliable?
The Mifflin-St Jeor formula is recommended by the Academy of Nutrition and Dietetics as the most accurate for healthy adults. Harris-Benedict remains acceptable but can overestimate by 5-10 %.
Should I eat exactly my TDEE every day?
No, aim for a weekly average. Some days you will eat a little more (training days) and others a little less. It's the weekly average that counts, not day-to-day precision.
Does TDEE work if I do intermittent fasting?
Yes. TDEE remains the same whether you eat over 8 hours or 16 hours. Intermittent fasting changes the eating window, not the energy expenditure. Your daily calorie goal does not change.

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