TDEE: the complete guide

Total daily energy expenditure (TDEE) is the calories you burn in a day from living, digesting, moving, and training. Calculators combine BMR (resting metabolism) with an activity factor—useful for planning, but never a perfect prediction for one person.

What TDEE is (and is not)

TDEE is an estimate of average daily burn. It is not a lab measurement of your metabolism today. Stress, sleep, steps, medications, and muscle mass all shift real expenditure around the number a formula prints.

How our calculator thinks

We estimate BMR with Mifflin–St Jeor, then multiply by an activity level you choose. That step is the largest source of error: most people sit between two categories. Start conservative, then adjust using weight trend (see below).

Adjust with real-world feedback

Track weight over 2–3 weeks while eating as consistently as you can. If weight is flat near your goal, your true maintenance is close to your intake. If it drifts, nudge calories by small steps (about 5–10% at a time) rather than chasing a single TDEE digit.

Deficits, surpluses, and safety

Aggressive cuts can raise fatigue and nutrient gaps; large surpluses add fat faster than lean gain for many people. Athletes, adolescents, pregnant or postpartum people, and anyone with a medical condition should follow clinician guidance—not an online target alone.

Put it together

Use TDEE as a starting line. Pair it with protein and fiber, strength training when appropriate, and sleep. Re-check the estimate when your routine or body weight changes meaningfully.

Open the TDEE calculator

Educational content only; not medical advice.