Nutrition glossary
What Is TDEE?
**TDEE (Total Daily Energy Expenditure)** is the total number of calories you burn in a day. It combines your resting metabolism, the energy used to digest food, everyday movement, and exercise.
Eat at your TDEE and your weight holds steady; eat below it and you lose, above it and you gain. It's the single most useful number for setting a calorie goal.
Short answer
TDEE (Total Daily Energy Expenditure) is the total number of calories you burn in a day. It combines your resting metabolism, the energy used to digest food, everyday movement, and exercise.
How TDEE is made up
Your TDEE is the sum of four parts, and they're not equal. Your BMR does most of the work, while the energy you can consciously influence — moving and training — is a smaller slice than most people expect.
- BMR — the calories your body burns at rest, roughly 60–70% of your TDEE
- TEF (Thermic Effect of Food) — the energy used to digest meals, about 10% of what you eat
- NEAT — all your non-exercise movement: walking, fidgeting, chores
- Exercise — deliberate training, often the smallest piece of the four
Why it matters for your goals
TDEE is the reference point every calorie goal is built from. To lose fat you eat below it, to gain muscle you eat above it, and to hold your weight you eat at it — your maintenance calories.
The catch is that TDEE isn't fixed. Diet for long enough and adaptive thermogenesis lowers it, so the deficit you set on day one quietly shrinks. That's why progress stalls even when your tracking is perfect.
How WhispCal uses it
A formula gives you a starting TDEE; your real one only shows up in the data. WhispCal compares what you actually eat against your weight trend over time to learn your true daily burn, then keeps your target accurate as your metabolism shifts — no manual recalculating.
Frequently asked questions
How do I calculate my TDEE?
Estimate your BMR with a formula like Mifflin-St Jeor, then multiply by an activity factor between 1.2 (sedentary) and 1.9 (very active). The result is your TDEE — your estimated total daily calorie burn.
What's the difference between TDEE and BMR?
BMR is what you'd burn lying in bed all day. TDEE is your BMR plus digestion, daily movement, and exercise. TDEE is always larger and is the number you set calorie goals from.
Does my TDEE change over time?
Yes. It drops as you lose weight, and prolonged dieting lowers it further through metabolic adaptation. That's why a fixed calorie target eventually stops producing results and needs adjusting.
Keep exploring
Let WhispCal do the math automatically
These numbers are a starting point. WhispCal measures how your body actually responds — logging food in 3 seconds by voice, photo, or barcode — and auto-adjusts your targets as your metabolism changes. Free on iOS and Android.
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