TDEE, Explained: Why Your Calorie Target Keeps Missing

Almost everyone who tracks calories eventually hits the same wall: the number that worked for six weeks quietly stops working. Nothing broke. Your total daily energy expenditure simply moved, and the target you calculated in January no longer describes the body you have in April.

The four buckets of daily burn

Total daily energy expenditure is the sum of four components, and only one of them is the gym.

• Basal metabolic rate — 60-70% of the total, driven mostly by lean mass.
• Thermic effect of food — roughly 10%, and higher on high-protein diets.
• Exercise activity — usually a smaller slice than people assume, 5-15%.
• Non-exercise activity thermogenesis — fidgeting, walking, standing: the most volatile bucket of all.

"In a deficit, NEAT can fall by several hundred calories a day without you noticing a single conscious change. — Levine, adaptive thermogenesis research"

Try the tdee calculator.

Recalculate on body change, not on the calendar

A useful rule: re-run the numbers every time your bodyweight moves by 4-5 kg, or whenever your training volume changes meaningfully. Weekly recalculation just chases noise on the scale.

Protein first, then the rest

Set protein at roughly 1.8 g per kg of bodyweight, keep fat above 0.6 g per kg for hormonal health, and let carbohydrate fill whatever calories remain. If you are lean and want a body-fat baseline to track alongside the scale, take five minutes with a tape measure instead of guessing.

The point of a calculator is not precision. It is giving you a defensible starting number so the next two weeks of data mean something.