Calculate your Total Daily Energy Expenditure — the number of calories your body burns each day. Set accurate targets for fat loss, muscle gain, or maintenance.
Your TDEE is the total calories you burn per day — BMR + digestion + daily movement + exercise. Eat below it to lose fat, above it to gain muscle, at it to maintain. Most people who 'eat at their TDEE' and don't maintain are overestimating their activity level by one tier.
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Written by Ash K · Last updated: May 2026 · Sources cited below
Your TDEE — Total Daily Energy Expenditure — is the number of calories your body actually burns in a 24-hour period. It's the single most useful number in nutrition planning, whether you want to lose fat, gain muscle, or simply maintain your current weight.
Every sustainable diet strategy starts here. Not with a trending protocol. Not with a calorie target someone else uses. With your number.
What Makes Up Your TDEE: The Four Components
TDEE is the sum of four components that add up to your total daily burn:
Basal Metabolic Rate (BMR) — roughly 60–70% of TDEE. This is the energy your body uses just to stay alive: breathing, circulating blood, maintaining temperature, producing cells. Your brain alone burns approximately 20% of your total energy. If you did nothing but lie in bed all day, BMR is what you'd still burn.
Thermic Effect of Food (TEF) — roughly 10% of TDEE. Your body burns calories digesting, absorbing, and processing food. Protein has the highest thermic effect (20–30% of calories consumed); carbs and fats are lower (5–10%). So 100 calories of chicken costs your body more energy to process than 100 calories of butter.
Non-Exercise Activity Thermogenesis (NEAT) — the calories burned from everything that isn't deliberate exercise: walking to your car, fidgeting, doing laundry, typing. NEAT varies enormously between individuals — by 300–500 calories per day or more. A nurse doing a 12-hour shift and an office worker sitting at a desk have dramatically different NEATs even if they do the same workout.
Exercise Activity Thermogenesis (EAT) — your intentional workouts. Despite what gym culture implies, this is usually the smallest component for most people: 5–15% of TDEE, because even intense sessions only last 1–2 hours.
Key Takeaway: TDEE = BMR + TEF + NEAT + EAT. The number that determines whether you lose, gain, or maintain weight. Eat consistently below it and you lose fat. Eat consistently above it and you gain weight. Eat at it and you stay the same. Everything else in nutrition is details.
This calculator uses the Mifflin-St Jeor equation — currently the most validated formula for estimating BMR across diverse populations — multiplied by an activity factor to estimate your TDEE.
Activity Multipliers — Impact on a 1,800 Cal BMR
Enter your age, sex, height, weight, and activity level. The result is a calorie estimate, not a law — but it's a well-founded starting point.
The activity level selector is where most people go wrong. Be honest, and lean toward underestimating:
| Activity Level | What it actually means | Multiplier |
|---|---|---|
| Sedentary | Desk job, little movement outside work, no structured exercise | 1.2 |
| Lightly Active | Desk job + exercise 1–3 days/week, or a low-activity job | 1.375 |
| Moderately Active | Exercise 3–5 days/week with real effort, or moderately active job | 1.55 |
| Very Active | Hard exercise 6–7 days/week, or physically demanding job | 1.725 |
| Extremely Active | Elite athlete training twice daily, or extremely physical labor + exercise | 1.9 |
Tip: Most people who consider themselves "moderately active" are actually "lightly active." If you have a desk job and exercise 3 times a week, that's lightly active, not moderate. Overestimating by one level adds 200–300 calories to your TDEE — which explains why so many people "eat at their TDEE" but don't maintain weight.
The calculator returns three numbers: your estimated BMR, your TDEE, and suggested intakes for fat loss, maintenance, and muscle gain.
How TDEE Is Calculated — Step by Step
The Mifflin-St Jeor equation was published in the American Journal of Clinical Nutrition in 1990 and has since been validated in multiple independent studies as the most accurate predictive formula for most populations.
For men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 5
For women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
A practical example: A 32-year-old woman, 165 cm, 68 kg, moderately active.
Why Mifflin over Harris-Benedict?
A 2005 systematic review in the Journal of the American Dietetic Association (Frankenfield et al.) compared predictive equations across diverse populations. Mifflin-St Jeor was roughly 5% more accurate than Harris-Benedict — which sounds small until you do the math. On a 2,400 calorie TDEE, a 5% error is 120 calories. Sustained over weeks, that compounds into meaningful differences.
Note: No formula is perfectly accurate for any individual. Individual TDEE can vary ±200–300 calories from predictions — even with perfect equation accuracy — because of factors formulas can't capture: genetics, gut microbiome composition, medication effects, hormonal status, and true muscle-to-fat ratio. Use the calculator result as a starting hypothesis, not a fixed fact.
How to Set Calorie Targets From Your TDEE
Once you have your TDEE, the application is straightforward.
For fat loss: Eat 300–500 calories below your TDEE. If your TDEE is 2,400, target 1,900–2,100 calories daily. This produces roughly 0.5–1 lb of fat loss per week — slow enough to preserve muscle, fast enough to see progress.
Research on metabolic adaptation is clear: aggressive deficits of 750+ calories accelerate muscle loss, increase hunger hormones, suppress metabolism, and are almost impossible to sustain beyond a few weeks. A moderate 500-calorie deficit maintained for months outperforms an aggressive deficit maintained for weeks (Hall, 2008).
For muscle gain (lean bulk): Eat 250–500 calories above your TDEE. If your TDEE is 2,400, target 2,650–2,900 calories. This provides the energy surplus muscle growth requires without excessive fat accumulation — particularly important when pairing with resistance training.
For maintenance: Eat approximately at your TDEE. You won't hit your exact number every day — that's fine. Average within ±100–150 calories across the week.
Warning: Never eat below your BMR for extended periods. Your BMR is the minimum your body needs just to sustain basic organ function. Sustained calorie intake below BMR causes muscle loss, hormonal disruption, metabolic suppression, and immune compromise. If your BMR is 1,400 and TDEE is 2,000, your floor is 1,400 — never below it.
For your macro breakdown within these calorie targets, the Macro Calculator splits calories into protein, carbs, and fats based on your specific goal. For a more granular deficit calculation tied to a specific target weight and timeline, the Calorie Deficit Calculator provides that detail.
The 2-Week Calibration Method: More Accurate Than Any Formula
Most people treat their calculator result as fact. It isn't — and understanding why matters for actually using it correctly.
The activity multiplier problem: You're self-reporting your lifestyle, and research shows people routinely overestimate their activity by 10–20%. One study found this translates to a 100–200 calorie error in the final TDEE prediction. Nobody wants to admit they're sedentary.
Multipliers are population averages: Two people with identical stats but different metabolic health, muscle mass, hormonal profiles, or gut microbiomes can have TDEEs that differ by 200–300 calories. The formula predicts what an "average" person with your characteristics would burn — you might not be average.
TDEE changes as you change: Lose 20 pounds and your TDEE drops, because there's less body to maintain. Gain muscle and it rises slightly. Recalculate every 4–6 weeks during active body composition changes.
The two-week calibration method — better than any formula:
Use your calculator result as a starting point. Eat as close to that number as you can for two weeks while tracking your weight every morning under consistent conditions (same time, after waking, after using the bathroom, before eating).
Average your daily weigh-ins for week one and week two separately.
If both weekly averages are nearly identical (within 0.2 kg), your estimated TDEE is accurate — you're maintaining. If week two's average is lower, you're actually in a deficit — your real TDEE is higher than estimated. If week two's average is higher, you're in a surplus — your real TDEE is lower.
Adjust by 100–200 calories and repeat. Within 4–6 weeks, you'll have a far more personalized number than any formula can provide. This real-world adjustment beats perfect math because it's based on your body's actual response, not a population average.
Bottom Line: Calculate your TDEE. Use it to set your starting calorie target. Track weight for two weeks. Adjust based on what actually happens. That sequence — formula + real-world calibration — is more accurate than either approach alone. Most people skip the calibration step and wonder why the calculator "doesn't work."
TDEE Application — Cut, Maintain, or Bulk
TDEE calculators work well for most healthy adults. There are situations where professional guidance is more appropriate:
Medical conditions that affect metabolism: thyroid disorders (hypo and hyperthyroid meaningfully alter BMR), PCOS, diabetes, metabolic syndrome. These change your actual TDEE in ways no formula accounts for.
Medications that influence metabolism or appetite: antidepressants, corticosteroids, antipsychotics, beta-blockers. If you're on medications and your weight doesn't respond to calculated deficits, a registered dietitian can investigate.
Extreme body composition: Elite athletes and people with obesity both have TDEEs that deviate more from formula predictions. The equations were built on average body compositions.
History of disordered eating: Calorie-focused nutrition planning can be harmful in these contexts. A registered dietitian with eating disorder specialization uses different approaches — not formula-based targets.
A registered dietitian can also measure your actual metabolic rate directly using indirect calorimetry — a breath test that eliminates the estimation error entirely.
What is a normal TDEE?
TDEE varies enormously by individual. A sedentary 5'4" woman in her 40s might have a TDEE of 1,800 calories. A 6'2" male athlete in his 20s might have a TDEE of 3,800 calories. There's no "normal" — there's your number. Use the calculator, then calibrate.
How accurate are TDEE calculators?
Typically within ±10–15% for most people. That's ±200–360 calories on a 2,400-calorie TDEE. Accurate enough to set a useful starting target — not accurate enough to use as gospel. The two-week calibration method above closes most of that gap.
How often should I recalculate?
Every 4–6 weeks during active fat loss or muscle gain. Every significant life change: new job with different activity demands, pregnancy, major illness, medication changes.
Does TDEE change with age?
Yes. The Mifflin-St Jeor equation factors in age because metabolic rate declines gradually — roughly 2–8% per decade after age 30, primarily driven by muscle mass loss. Maintaining muscle through resistance training is the most effective way to slow this decline.
What's the difference between TDEE and BMR?
BMR is your resting metabolic rate — what you'd burn doing nothing. TDEE is BMR plus all activity. TDEE is always higher. If your BMR is 1,600 and you're moderately active (multiplier 1.55), your TDEE is 2,480. Eating at BMR puts you in a 880-calorie deficit — not sustainable.
For a deeper dive into the science behind TDEE, see our complete TDEE guide.
This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider with questions about your health.