TDEE Explained: How Your Daily Calorie Burn Is Actually Estimated

TDEE, total daily energy expenditure, is the number of calories your body burns in a day, and it is the number every calorie target is built on. For most adults it lands between roughly 1,600 and 3,000 calories: a smaller, sedentary person sits near the bottom of that range and a large, highly active person near or above the top. Virtually every calculator estimates it the same way: a resting burn from the Mifflin-St Jeor equation, multiplied by an activity factor between 1.2 and 1.9. This guide shows the exact formula and multipliers Nouri itself runs when it computes your targets, works two full examples, and explains why the computed number is a starting hypothesis that your own logged data will outperform within a month.

What is inside your daily burn

Resting metabolism is the energy of simply being alive: organs, brain, temperature, cell turnover. For most people it is the largest share of the total. It scales with body size, which is why the formula's biggest input is weight.

Activity covers workouts, but also, and often more importantly, everything else that moves you: walking, standing, stairs, fidgeting, a physical job. This non-exercise movement varies more between people than gym time does, and it is the reason two same-sized friends can maintain on very different intakes. It is also the component you estimate when you pick an activity level, and the place where most calculator error enters.

Digestion costs energy too: processing food burns a modest share of what you eat. You do not need to model it separately; the activity multipliers absorb it.

The exact formula Nouri runs

This section is firsthand: it is the actual calculation in Nouri's backend when you finish onboarding, not a generic approximation. Resting burn comes from the Mifflin-St Jeor equation, published in the American Journal of Clinical Nutrition in 1990 and still the standard for healthy adults:

• Women: 10 x weight (kg) + 6.25 x height (cm) - 5 x age - 161
• Men: 10 x weight (kg) + 6.25 x height (cm) - 5 x age + 5

Nouri then multiplies by these activity factors:

Activity level (as asked in onboarding)	Multiplier
Sedentary	1.2
Lightly active	1.375
Moderately active	1.55
Very active	1.725
Extremely active	1.9

TDEE is rounded, then adjusted for your goal exactly like this:

Goal	Adjustment
Lose weight	TDEE - 500
Maintain	TDEE + 0
Gain weight	TDEE + 300

Two more implementation details worth knowing because they affect your number: if you skip the activity question, Nouri assumes moderately active (1.55), and the final calorie target is never set below 1,200 regardless of what the arithmetic produces, as a safety floor.

Two worked examples

Example 1. A 30-year-old woman, 165 cm, 70 kg, lightly active, goal: lose.

• Resting: 10 x 70 + 6.25 x 165 - 5 x 30 - 161 = 700 + 1,031.25 - 150 - 161 = 1,420 calories
• TDEE: 1,420.25 x 1.375 = 1,952.8, rounded to 1,953 calories
• Target: 1,953 - 500 = 1,453 calories per day

Example 2. A 42-year-old man, 180 cm, 95 kg, moderately active, goal: maintain.

• Resting: 10 x 95 + 6.25 x 180 - 5 x 42 + 5 = 950 + 1,125 - 210 + 5 = 1,870 calories
• TDEE: 1,870 x 1.55 = 2,898.5, rounded to 2,899 calories
• Target: maintain, so about 2,900 calories per day

Same formula, same multipliers, and the two people are nearly 1,500 calories apart. This is why copying someone else's calorie target is meaningless.

How the number moves across profiles (all computed with the same formula, moderately active, maintain):

Profile	Resting	TDEE (x1.55)
Woman, 25, 160 cm, 60 kg	1,314	2,037
Woman, 40, 165 cm, 75 kg	1,420	2,201
Man, 25, 175 cm, 70 kg	1,674	2,594
Man, 50, 183 cm, 100 kg	1,899	2,943

Why your real TDEE is found, not calculated

The formula is a population average and your activity level is a self-rating, which makes the computed TDEE a good starting hypothesis and nothing more. Your actual number is discoverable with the tools you already have: eat a consistent, honestly logged intake for two to three weeks and watch the scale trend. A flat trend means you found maintenance, your true TDEE, more precisely than any equation. Steady loss means your intake sits below TDEE by roughly the gap your rate of loss implies. Steady gain means the reverse.

The failure mode of this experiment is dishonest data, and the classic evidence is worth knowing: in a New England Journal of Medicine study of people convinced their metabolisms were broken, measured energy expenditure was normal, while the subjects were underreporting food intake by an average of 47 percent and overreporting exercise by 51 percent. Their TDEEs were fine; their logs were not. If your trend contradicts your log, audit the log first, starting with the usual missing items.

There is one more moving part: TDEE is not constant. Lose ten kilograms and the weight term in the formula shrinks; get a desk job and the multiplier that used to fit no longer does. Recompute when your body or routine changes meaningfully, and treat the trend as the ongoing referee.

Tracking against your TDEE, practically

Knowing the number only pays off if intake gets logged against it, which is where most people's system breaks. A comparison of the common approaches, with facts from each product's official site or App Store listing, checked August 29, 2026:

App	How you log	Target setting	Platforms	Price
Nouri	Type or say a sentence, Siri hands-free, photo	Computes the exact formula above at onboarding, tracks progress automatically	iPhone (iOS only)	$9.99/month or $79.99/year, 3-day free trial on the yearly plan
MyFitnessPal	Database search, barcode scan	Calorie and macro goals	iOS, Android, web	Free tier; Premium $79.99/yr; Premium+ $99.99/yr or $24.99/mo; 7-day trial
Cronometer	Database search, barcode; photo and voice on paid tier	Calorie, macro, and micronutrient targets	iOS, Android, web	Free tier; Gold $10.99/mo or $59.99/yr
Cal AI	Photo first, barcode, describe	Plan built from lifestyle questions	iOS, Android	Subscription after 3-day trial; App Store lists Unlimited purchases $2.99 to $29.99

I treat my own computed target as a hypothesis and let the logs arbitrate, and that only works because logging is cheap: one typed or spoken sentence per meal means the data actually exists at the end of the week. However you log, the loop is the same: number, honest data, two-week verdict, adjust.

Common TDEE mistakes

Overrating your activity level. The multiplier question is where most error enters: exercising three times a week does not make a desk-bound life "very active." When in doubt, pick the lower level; the trend will correct you upward far more pleasantly than downward.

Treating the calculator number as truth. It is the average for people shaped like you, not a measurement of you. Two weeks of logs beats it every time.

Recomputing constantly. Day-to-day TDEE wobble is real but unactionable. Recompute on meaningful change (several kilograms, new routine), otherwise leave the target alone and steer by trend.

Stacking device burns on top of the multiplier. Your activity factor already includes exercise. Adding a watch's workout calories on top double-counts the same movement, and device burn numbers skew high anyway.

Ignoring the floor. If the arithmetic pushes below 1,200, Nouri clamps it there deliberately. Very low targets are a medical conversation, not an app setting.

FAQ

What is TDEE?

Total daily energy expenditure: all the calories your body burns in a day, combining resting metabolism, activity, and digestion. It is the reference point every calorie target is set against.

How do I calculate my TDEE?

Compute resting burn with Mifflin-St Jeor (women: 10 x kg + 6.25 x cm - 5 x age - 161; men: same + 5 instead of - 161), then multiply by an activity factor from 1.2 to 1.9. The two worked examples above show every step.

What is a normal TDEE for a woman?

Commonly in the 1,800 to 2,200 range for moderately active women of average size, as the profile table shows, but the spread is wide: size, age, and activity move it by hundreds of calories in either direction.

What is a normal TDEE for a man?

Often 2,400 to 2,900 for moderately active men of average-to-large size, per the same table. The formula, not the averages, is what applies to you.

Is TDEE the same as BMR?

No. BMR (or resting burn) is what you burn at rest; TDEE is BMR multiplied up to include movement and digestion. Nouri computes both and shows the target built from TDEE.

How accurate are TDEE calculators?

Good enough to start, not good enough to trust forever: the equation is a population average and the activity level is a guess. Two to three weeks of honest logging against a stable intake reveals your true number.

Should I eat below my TDEE to lose weight?

Yes, that is the definition of a deficit. Nouri applies exactly 500 below TDEE for a loss goal; Calorie Counting 101 covers gentler and more aggressive choices and their trade-offs.

Why am I not losing weight eating under my TDEE?

Either the TDEE estimate is high (activity overrated), the intake log is incomplete (the NEJM study above found 47 percent underreporting in exactly this situation), or it has been less than two weeks and water is masking the trend. In that order of likelihood.

Does TDEE change as I lose weight?

Yes. Weight is the formula's largest input, so the number drifts down as you shrink. Recompute after meaningful loss, or simply keep steering by your logged trend, which adjusts automatically.

Do I need to eat back exercise calories on top of TDEE?

No, your activity multiplier already includes your exercise. Eating back device-reported burns on top of a TDEE-based target double-counts movement and commonly erases the deficit.

What activity multiplier should I choose?

Match it to your whole life, not your gym schedule: sedentary 1.2 through extremely active 1.9, as in the table above. If torn between two, take the lower; Nouri defaults to 1.55 when the question is skipped.

What formula does Nouri use for TDEE?

Exactly what this post shows: Mifflin-St Jeor for resting burn, the 1.2 to 1.9 multiplier table, minus 500 for a loss goal or plus 300 for gain, with a 1,200-calorie floor. It is the same arithmetic as the worked examples, run automatically at onboarding.

Bottom line

TDEE is estimated in two multiplications: Mifflin-St Jeor for your resting burn, times an activity factor, and Nouri runs precisely that formula, with a 500-calorie cut for loss goals and a 1,200 floor, the moment you finish onboarding. Compute your own number with the worked examples, then remember the real rule: the formula starts the conversation and your logged two-week trend ends it. Nouri handles both halves, the math at onboarding and the effortless daily logging that makes the trend readable. From here, Calorie Counting 101 turns the number into a plan and How to Track Macros splits it into targets worth training on.

Sources

• Mifflin MD, St Jeor ST et al., "A new predictive equation for resting energy expenditure in healthy individuals," American Journal of Clinical Nutrition, 1990, pubmed.ncbi.nlm.nih.gov/2305711 (checked August 29, 2026)
• Lichtman SW et al., "Discrepancy between self-reported and actual caloric intake and exercise in obese subjects," New England Journal of Medicine, 1992, pubmed.ncbi.nlm.nih.gov/1454084 (checked August 29, 2026)
• Nouri's target computation (formula, multipliers, goal adjustments, default, and floor): Nouri's own onboarding calculation, stated firsthand
• App pricing: myfitnesspal.com/premium, cronometer.com/gold, calai.app and its App Store listing (all checked August 29, 2026)