Calculate Your TDEE
What TDEE actually includes
Total Daily Energy Expenditure is every calorie your body burns across a full 24-hour day, made up of four components:
- BMR (Basal Metabolic Rate) — calories burned at complete rest just to stay alive. This is the largest share, typically 60–70% of the total.
- TEF (Thermic Effect of Food) — the energy spent digesting and processing what you eat, roughly 10% of intake. Protein has the highest thermic effect of the three macronutrients.
- NEAT (Non-Exercise Activity Thermogenesis) — everything that isn't formal exercise: walking, standing, fidgeting, daily chores. NEAT varies enormously between individuals and is a major reason two people the same size can have very different real-world calorie needs.
- Exercise activity — calories burned during deliberate training: gym sessions, running, sports.
Worked example
Using the same 30-year-old, 75kg, 175cm example with moderate activity (×1.55): BMR of ~1,699 × 1.55 = ~2,633 calories/day to maintain current weight. To lose roughly 0.5kg/week, that becomes about 2,133 calories/day; to gain, about 2,908.
Activity level reference
| Level | Multiplier | Who it fits |
|---|---|---|
| Sedentary | 1.2 | Desk job, little to no structured exercise |
| Light | 1.375 | Light exercise 1–3 days per week |
| Moderate | 1.55 | Moderate exercise 3–5 days per week |
| Active | 1.725 | Hard exercise 6–7 days per week |
| Very active | 1.9 | Physical job plus daily training |
Most people overestimate their own activity level. If you sit for work and train a few times a week, "Light" or "Moderate" is usually a more honest fit than "Active" — picking too high a multiplier is one of the most common reasons a TDEE-based plan stalls.
How activity level changes the number
The multiplier is the biggest lever in this calculation — someone training 6 days a week can have a TDEE 500–700 calories higher than someone with an identical BMR who's mostly sedentary. Pick the level that reflects a typical week, not your best week.
Using TDEE to lose, maintain, or gain weight
- Maintain: eat at your TDEE and weight should hold roughly steady.
- Lose weight: eat below TDEE. A deficit of about 500 calories/day corresponds to roughly 1lb (0.45kg) of fat loss per week, since ~3,500 calories is approximately equal to a pound of body fat.
- Gain weight: eat above TDEE. A surplus of 250–500 calories/day supports steady gain while limiting excess fat gain, especially when paired with resistance training.
Avoid extreme deficits — cutting too aggressively risks muscle loss, low energy, and a plan that's hard to sustain. General dietary guidance favors gradual, moderate adjustments over drastic ones.
Using TDEE as a starting point, not a fixed target
TDEE is an estimate based on population-average formulas, not a measurement of your exact metabolism — actual calorie burn varies by several hundred calories between two people with identical stats. Treat the number as a starting point: track your weight over 2-3 weeks at that intake, ideally using a weekly average to smooth out day-to-day water and food fluctuations, and adjust up or down by 100-200 calories if the trend doesn't match your goal. This feedback loop — watching what actually happens to your weight — is more reliable than any formula alone.
Why NEAT matters more than most people think
Of the four components that make up TDEE, NEAT is the one people most consistently underestimate. Two people with identical BMR, weight, and formal exercise schedules can still have a 300–500 calorie difference in daily burn purely from how much they move outside the gym — pacing during calls, taking stairs, standing versus sitting, general fidgeting. This is part of why two people "eating the same" can see different results: the activity multiplier in this calculator is a population average, and it can't capture someone's individual NEAT.
Common misconceptions about TDEE
"If I eat exactly my TDEE, my weight will never change." TDEE itself shifts as your weight changes — losing weight generally lowers TDEE somewhat, which is part of why weight loss often slows over time even without any change in effort.
"A higher activity multiplier is always more accurate for me." People consistently round up when selecting an activity level. Choosing a lower, more honest multiplier and adjusting from real-world results is more reliable than assuming you're more active than you are.
"TDEE calculators are basically useless since everyone's different." The formula won't be exact for any one person, but it gets most people within a reasonable range to start from — the real value comes from using it as a starting point and adjusting based on 2-3 weeks of actual weight trend data, not expecting the first number to be perfect.
How TDEE connects to BMR, calories, and macros
TDEE builds directly on BMR, which is the resting foundation the activity multiplier scales up. Once you have a maintenance number, adjust it for your goal (deficit, maintenance, or surplus), then use the macro calculator to split that target into protein, carbs, and fat — the breakdown that actually determines what to eat, not just how much.
Frequently Asked Questions
How accurate is a TDEE estimate?
Formula-based TDEE typically lands within about 10% of a person's real energy expenditure, though genetics, NEAT, and hormonal status can shift the true number further in either direction.
Should I eat exactly my TDEE to lose weight?
No — TDEE is your maintenance level. To lose weight you need to eat below it (typically by around 500 calories/day); to gain, above it.
How do I know my real activity level?
Be conservative. A desk job plus 3 weekly workouts is usually "Light" or "Moderate," not "Active" — most people overestimate this input.
What's the difference between BMR and TDEE?
BMR is energy burned at complete rest. TDEE is BMR multiplied by an activity factor, so it also accounts for digestion, daily movement, and exercise — TDEE is always higher than BMR and is the number to base an eating plan on.
How often should I recalculate TDEE?
Recalculate after roughly a 10lb (4.5kg) weight change or a real shift in activity level — both meaningfully change the number, which is part of why weight-loss progress often slows over time without an adjustment.
Is TDEE different for men and women?
Yes — the underlying Mifflin–St Jeor formula uses different constants for each, reflecting average differences in body composition, and individual muscle mass shifts the real number further.
Does TDEE include the calories I burn digesting food?
Yes — that's the Thermic Effect of Food component, roughly 10% of total intake, already factored into how TDEE is estimated from BMR and activity level.
Sources & References
- Mifflin MD, St Jeor ST, et al. — A new predictive equation for resting energy expenditure (American Journal of Clinical Nutrition, 1990)
- U.S. Departments of Agriculture and Health & Human Services — Dietary Guidelines for Americans, 2020–2025
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) — Energy balance and weight management