TDEE Calculator

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Part of:Calories & Nutrition 2026: The Complete Science-Based Guide to TDEE, Macros & Every Goal

Professional review pending. TDEE Calculator has passed formula and automated QA checks, but no independently verified clinician is currently attributed. Content updated June 21, 2026. Review process

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TDEE Calculator

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Free TDEE calculator — calculate your Total Daily Energy Expenditure using the Mifflin-St Jeor formula with BMR, macro breakdown, cutting and bulking calories.

Age

Gender

Height

Height Unit

Weight

Weight Unit

Activity Level

Enter values above to see results.

About This Calculator

🔥 TDEE Calculator — Complete Guide

Formula transparency, activity factors, worked examples, and limitations

🔬 Evidence-Based

BMR

Resting-energy estimate

TDEE

BMR adjusted for activity

1.2–1.9

Activity-factor range

2–3 weeks

Useful trend-check period

TDEE ComponentsMifflin-St JeorActivity MultipliersCalorie GoalsMyths vs FactsFAQs

How TDEE Is Calculated

Total Daily Energy Expenditure (TDEE) is the total calories your body burns in 24 hours. It is calculated as: TDEE = BMR × Activity Multiplier.

The calculator first estimates resting energy with the Mifflin–St Jeor equation: men, BMR = 10 × kg + 6.25 × cm − 5 × age + 5; women, BMR = 10 × kg + 6.25 × cm − 5 × age − 161. It then multiplies BMR by the selected activity factor (1.2–1.9).

Worked example: for a 30-year-old man who is 80 kg and 180 cm, BMR = 1,805 kcal/day. Selecting moderately active gives 1,805 × 1.55 = about 2,798 kcal/day TDEE. That is an estimated maintenance starting point, not a prescription.

TDEE Components

▸BMR (60–70%): Resting metabolic rate — calories burned at complete rest
▸TEF (10%): Thermic effect of food — digesting & absorbing calories
▸NEAT (15–30%): Non-exercise activity — fidgeting, walking, standing
▸EAT (5–15%): Exercise activity thermogenesis — planned workouts
▸NEAT varies most — key lever for weight management outside exercise

Activity Multipliers (PAL Values)

Activity Level	Multiplier	Description
Sedentary	1.2	Desk job, little or no exercise; minimal daily movement
Lightly Active	1.375	Light exercise 1–3 days/week; some walking during day
Moderately Active	1.55	Moderate exercise 3–5 days/week; active commute or job
Very Active	1.725	Hard exercise 6–7 days/week; physically demanding work
Extra Active	1.9	Very hard daily exercise plus physical job; 2x/day training

Activity labels are broad approximations. Choose the closest description, avoid adding exercise calories again, and calibrate the estimate against a consistent real-world trend.

TDEE Myths vs Facts

✗MYTH: Eating less always causes weight loss

✓FACT: TDEE-based deficit is required for weight loss, but extreme restriction triggers metabolic adaptation (down-regulation of NEAT, thyroid hormones, leptin). A deficit of more than 1,000 kcal/day can cause metabolic rate to decrease disproportionately, muscle loss, and hormonal disruption.

✗MYTH: Skipping meals raises metabolism ("fasting mode")

✓FACT: There is no evidence that meal frequency meaningfully affects metabolic rate in free-living conditions. Fasted states do not trigger "starvation mode" in normal timescales. Total daily calories and protein intake matter far more than meal timing or frequency.

✗MYTH: More cardio always means more fat loss

✓FACT: Cardio compensation (reducing NEAT after exercise sessions — sitting more, moving less) frequently offsets a significant portion of calories burned during workouts. Studies show people who add cardio often compensate with ~30–70% of the burned calories through reduced spontaneous activity.

✗MYTH: Your metabolism is fixed by genetics

✓FACT: While genetics influence BMR by ±5–10%, lifestyle factors — muscle mass, diet quality, sleep, stress, and physical activity — have far greater and more modifiable influence on TDEE. Building muscle (resistance training) is the most durable way to increase resting metabolic rate.

History of Metabolic Rate Estimation

Direct measurement of human energy expenditure began with calorimetry experiments by Wilbur Atwater in the 1890s, who built room-sized calorimeters to measure heat output from subjects. The Harris-Benedict equation, the first widely used formula for estimating BMR from age, height, and weight, was published in 1919 and remained the standard for over 70 years.

The Mifflin-St Jeor equation, now the more commonly recommended formula (and typically the default in TDEE calculators like this one), was published in 1990 using a larger, more representative modern sample and has been shown in validation studies to be more accurate than Harris-Benedict for the contemporary population.

Frequently Asked Questions

What is the difference between TDEE and BMR?›

BMR (Basal Metabolic Rate) is the calories burned at complete rest — just to maintain basic biological functions (breathing, heartbeat, organ function). TDEE includes BMR plus all additional energy expended during the day: digestion (TEF), movement (NEAT), and exercise (EAT). TDEE is always higher than BMR.

How accurate is a TDEE calculator?›

TDEE calculations are estimates with ±10–20% error for individuals. Activity multipliers add the largest source of error. For best accuracy: 1) track actual food intake for 2–3 weeks while weight is stable, 2) that intake equals your true TDEE. Adjustments based on real weight change data beat any formula.

What calorie deficit should I aim for?›

A 300–500 kcal/day deficit produces ~0.3–0.5 kg/week of weight loss while preserving muscle mass when combined with adequate protein. Larger deficits (500–750 kcal/day) are appropriate when BMI is above 30. Deficits above 1,000 kcal/day should only be done under medical supervision.

What calorie surplus should I use to build muscle?›

A modest surplus of 200–300 kcal/day (lean bulk) minimizes fat gain while supporting muscle protein synthesis. Larger surpluses (500+ kcal/day) increase fat gain proportionally without meaningfully accelerating muscle gain beyond physiological rate (~0.5–1.0 kg muscle/month for natural trainees).

Why has my weight loss stalled on the same calories?›

Weight loss stalls because TDEE decreases as body weight drops (lighter body burns fewer calories) and NEAT often decreases unconsciously. Recalculate TDEE at your current weight. You may need to reduce intake by 100–200 kcal/day or add 30 minutes of additional movement per day.

Does muscle really burn more calories than fat?›

Yes, but the effect is modest. Each kg of muscle burns approximately 13–14 kcal/day at rest vs. ~4–5 kcal/day for fat. Adding 5 kg of muscle increases BMR by ~45–50 kcal/day. The main benefit of resistance training for metabolism is preserving muscle mass during a deficit, not creating large caloric burns.

How does age affect TDEE?›

BMR decreases by approximately 1–2% per decade after age 20, primarily due to decreasing muscle mass (sarcopenia). Total TDEE decline averages ~7–10 kcal/day per year in sedentary adults. Resistance training can largely offset age-related metabolic decline by preserving lean muscle mass.

Should I eat back calories burned during exercise?›

For TDEE-based tracking: only if you used a sedentary or lightly active multiplier that doesn't account for your exercise. For most people using a moderate activity multiplier, exercise is already included in TDEE. Apps like MyFitnessPal add exercise calories on top — which leads to double-counting if you used an active TDEE multiplier.

References & Further Reading

• Mifflin MD et al. — A new predictive equation for resting energy expenditure in healthy individuals, Am J Clin Nutr 1990;51(2):241-247
• Levine JA — Non-exercise activity thermogenesis (NEAT), Best Practice & Research Clin Endocrinol Metab 2002;16(4):679-702
• Hall KD et al. — Calorie for Calorie, Dietary Fat Restriction Results in More Body Fat Loss than Carbohydrate Restriction, Cell Metabolism 2015;22(3):427-436
• National Academies — Dietary Reference Intakes for Energy and Macronutrients

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TDEE Calculator

Calculate Total Daily Energy Expenditure using Mifflin-St Jeor BMR with activity multiplier and macro split.

Reviewed by CalculatorApp.me Health Team

TDEE Calculator — Complete Guide

Total Daily Energy Expenditure formulas, BMR equations, activity multipliers, and evidence-based calorie science.

TDEE

Total Daily Energy Expenditure

BMR

60-75% of TDEE

NEAT

15-30% of TDEE

TEF

8-15% of TDEE

What Is TDEE?

Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a 24-hour period. It represents the sum of all energy used for vital functions, digestion, physical activity, and non-exercise movement.

TDEE consists of four components: Basal Metabolic Rate (BMR) — calories burned at complete rest (60-75%); Thermic Effect of Food (TEF) — energy to digest food (8-15%); Exercise Activity Thermogenesis (EAT) — intentional exercise (5-10%); and Non-Exercise Activity Thermogenesis (NEAT) — fidgeting, walking, posture (15-30%).

Understanding your TDEE is the foundation of any nutrition plan. To lose weight, eat below TDEE (deficit); to gain weight, eat above (surplus); to maintain, eat at TDEE. A 500-calorie daily deficit yields approximately 1 pound of fat loss per week.

TDEE & BMR Formulas

Mifflin-St Jeor (Most Accurate)

Men:   BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 5
Women: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161

Example (30-year-old male, 80 kg, 178 cm):
BMR = 10(80) + 6.25(178) − 5(30) − 5
BMR = 800 + 1112.5 − 150 − 5
BMR = 1,757.5 kcal/day

TDEE = BMR × Activity Factor
TDEE = 1,757.5 × 1.55 (moderate)
TDEE = 2,724 kcal/day

Validated in 2005 ADA study as the most accurate predictive equation — within 10% for 82% of individuals.

Harris-Benedict (Revised 1984)

Men:   BMR = 88.362 + 13.397×wt(kg) + 4.799×ht(cm) − 5.677×age
Women: BMR = 447.593 + 9.247×wt(kg) + 3.098×ht(cm) − 4.330×age

Example (same 30M, 80kg, 178cm):
BMR = 88.362 + 13.397(80) + 4.799(178) − 5.677(30)
BMR = 88.362 + 1071.76 + 854.22 − 170.31
BMR = 1,844 kcal/day

Note: Harris-Benedict tends to overestimate by 5%
compared to Mifflin-St Jeor

The original 1919 equation, revised in 1984. Still widely used but Mifflin-St Jeor is preferred for accuracy.

Katch-McArdle (Uses Lean Mass)

BMR = 370 + 21.6 × Lean Body Mass (kg)

Lean Mass = Weight × (1 − Body Fat %)

Example (80 kg, 18% body fat):
Lean Mass = 80 × (1 − 0.18) = 65.6 kg
BMR = 370 + 21.6 × 65.6
BMR = 370 + 1,417
BMR = 1,787 kcal/day

Best for: athletes & muscular individuals
who know their body fat percentage

Most accurate for athletes and muscular individuals because it accounts for lean body mass directly.

Activity Multipliers

Activity     | Factor | Description
─────────────|────────|─────────────────────────
Sedentary    | 1.2    | Desk job, no exercise
Light        | 1.375  | Light exercise 1-3d/wk
Moderate     | 1.55   | Moderate exercise 3-5d/wk
Active       | 1.725  | Hard exercise 6-7d/wk
Very Active  | 1.9    | Athlete/physical job + exercise

Example (BMR = 1,758):
Sedentary:  2,109 kcal
Moderate:   2,724 kcal
Very Active: 3,340 kcal

Difference: 1,231 kcal/day!

Most people overestimate their activity level. Start with one level lower than you think and adjust based on results.

Calorie Goals by Objective

Goal	Calorie Adjustment	Rate	Protein Target	Best For
Aggressive Cut	TDEE − 750-1,000	1.5-2 lbs/week	1.2-1.4 g/kg	Short-term weight loss
Moderate Cut	TDEE − 500	1 lb/week	1.0-1.2 g/kg	Sustainable fat loss
Mild Cut	TDEE − 250	0.5 lb/week	0.8-1.0 g/kg	Preserving muscle
Maintenance	TDEE ± 0	No change	0.8 g/kg	Weight stability
Lean Bulk	TDEE + 250	0.5 lb/week	1.6-2.2 g/kg	Muscle gain (minimal fat)
Bulk	TDEE + 500	1 lb/week	1.4-2.0 g/kg	Muscle & strength gain

History of Energy Expenditure Science

1783

Lavoisier — Father of Calorimetry

Antoine Lavoisier demonstrated that respiration is a form of combustion, measuring heat and CO₂ output of guinea pigs. He coined 'calorie' as a unit of heat and established the foundation of metabolic science.

1919

Harris-Benedict Equation Published

James Arthur Harris and Francis Gano Benedict published their landmark BMR equation based on measurements of 239 subjects. Despite being over 100 years old, the revised version remains in use today.

1990

Mifflin-St Jeor Equation

M.D. Mifflin and S.T. St Jeor published a new BMR prediction equation based on modern body compositions. Later validated by the ADA as 10% more accurate than Harris-Benedict for contemporary populations.

1999

Doubly Labeled Water Method

The doubly labeled water (DLW) technique became the gold standard for measuring TDEE in free-living conditions. It uses isotopes ²H and ¹⁸O in water to track CO₂ production over 1-2 weeks — the most accurate TDEE measurement method.

2005

NEAT Discovery by Levine

Dr. James Levine at the Mayo Clinic published groundbreaking research on Non-Exercise Activity Thermogenesis (NEAT), showing it can vary by up to 2,000 calories/day between individuals and is the main reason some people resist weight gain.

2023

IAEA DLW Database

The International Atomic Energy Agency published the largest-ever dataset of doubly labeled water TDEE measurements (6,621 individuals, 29 countries). It revealed that TDEE peaks at ages 20-40, then declines ~0.7%/year.

Key Research & Data

American Dietetic Association

BMR Equation Comparison Study (2005)

Compared 4 BMR equations in 2,364 subjects. Mifflin-St Jeor was accurate within ±10% for 82% of individuals — significantly better than Harris-Benedict (69%), WHO (71%), and Owen (73%). Now recommended by the ADA.

Mayo Clinic / Dr. James Levine

NEAT — The Hidden Calorie Burner

NEAT varies by up to 2,000 kcal/day between individuals. Lean people stand and move 2.5 hours/day more than obese people, burning 350+ extra kcal/day. NEAT is the most modifiable TDEE component and the key to metabolic health.

Science (Pontzer et al., 2021)

Daily Energy Expenditure Across the Lifespan

Analyzing 6,421 individuals aged 8 days to 95 years, metabolism is truly stable from ages 20-60 (declining only 0.7%/year). The dramatic decline begins after 60. Infants have the highest metabolic rate relative to body size (50% above adult).

International Journal of Obesity

Metabolic Adaptation to Weight Loss

After losing 10%+ of body weight, TDEE drops by 200-400 kcal/day more than predicted — called 'adaptive thermogenesis.' This metabolic adaptation persists for 6-12 months, contributing to weight regain. Diet breaks may mitigate it.

TDEE Myths vs. Facts

✕

Your metabolism slows dramatically after age 30.

✓

The 2021 Pontzer study of 6,421 people found metabolism is remarkably stable from ages 20-60, declining only 0.7%/year. The real decline starts after 60. Weight gain in your 30s-40s is primarily from reduced activity and increased intake.

✕

Eating 6 small meals per day boosts metabolism.

✓

Meal frequency has no significant effect on TDEE. The Thermic Effect of Food (TEF) is based on total calories and macros consumed — not how many meals they're split into. A systematic review of 15 studies found no metabolic advantage.

✕

Starvation mode stops weight loss completely.

✓

While metabolic adaptation is real (200-400 kcal/day decrease), it never prevents weight loss entirely. At severe caloric restriction, the body adapts by reducing NEAT, lowering thyroid hormones, and increasing hunger — but a deficit still produces loss.

✕

Exercise is the main driver of calorie burn.

✓

Exercise (EAT) accounts for only 5-10% of TDEE for most people. BMR is 60-75%, NEAT is 15-30%, and TEF is 8-15%. You can't outrun a bad diet — a 30-minute run burns ~300 kcal, one cheeseburger is 500+ kcal.

Frequently Asked Questions

What does TDEE stand for?▼

TDEE stands for Total Daily Energy Expenditure — the total calories your body burns in 24 hours. It includes your basal metabolic rate (BMR), thermic effect of food (TEF), exercise activity (EAT), and non-exercise activity (NEAT).

How is TDEE different from BMR?▼

BMR is calories burned at complete rest — just organ function, breathing, and circulation. TDEE includes BMR plus all activity. For moderately active people, TDEE is typically 1.55× their BMR.

Which TDEE formula is most accurate?▼

The Mifflin-St Jeor equation is the most accurate for general populations (ADA validated). For athletes or muscular individuals who know their body fat %, the Katch-McArdle equation may be more precise.

How do I use TDEE for weight loss?▼

Subtract 500 kcal/day from your TDEE to lose approximately 1 lb/week. Example: TDEE of 2,500 → eat 2,000 kcal/day. Track weight weekly and adjust — if not losing, reduce by another 100-200 kcal.

Can I increase my TDEE?▼

Yes — primarily through increasing NEAT (walk more, stand desk, take stairs) and building muscle (which raises BMR by ~6 kcal/lb of muscle). Adding 10,000 daily steps can increase TDEE by 300-500 kcal.

What is metabolic adaptation?▼

When you diet, your body reduces TDEE below what equations predict — by 200-400 kcal/day. This is driven by reduced NEAT, lower thyroid hormones, and improved metabolic efficiency. Diet breaks every 6-8 weeks may help.

How many calories should I eat to gain muscle?▼

Eat TDEE + 250-500 kcal/day (lean bulk) with high protein (1.6-2.2 g/kg body weight). This supports muscle growth while minimizing fat gain. Train with progressive overload.

Why am I not losing weight at a 'deficit'?▼

Common reasons: underestimating calories consumed (most people under-report by 30-50%); overestimating activities; metabolic adaptation; water retention masking fat loss; or your TDEE estimate was too high — recalculate, weigh/measure food.

Does muscle really burn more calories than fat?▼

Yes, but less than often claimed. Muscle burns ~6 kcal/lb/day vs. fat at ~2 kcal/lb/day. Gaining 10 lbs of muscle increases daily BMR by only ~40 kcal. The real benefit is increased NEAT and exercise capacity.

How accurate are TDEE calculators?▼

Online calculators are estimates within ±10-15%. For precise TDEE, track calories and weight for 3-4 weeks, then calculate: if weight is stable, your average intake equals your TDEE. Adjust from there.

Does the thermic effect of food (TEF) matter?▼

TEF accounts for 8-15% of TDEE and varies by macronutrient: protein has the highest TEF (20-35%), then carbs (5-15%), then fat (0-5%). A high-protein diet burns more calories during digestion.

Should I eat back exercise calories?▼

Partially. Exercise calorie trackers overestimate by 30-50%. If you want to eat back exercise calories, eat back 50% of what your tracker says. Better approach: set a fixed moderate deficit and keep it consistent.

References

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The standard BMI formula overestimates BMI for tall people and underestimates it for short people. The Oxford/Trefethen formula (2013) corrects this bias — try it alongside your TDEE.

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Methodology, sources & limitations

This calculator uses a published formula and the values entered in the calculator to generate the result.

Formula: TDEE = BMR × Activity Factor
Jurisdiction & units: Intended for US, IN, EU, GB, Global. Supports both units where applicable.
Assumptions & limitations: Results are screening or educational estimates based on the inputs you provide. They do not diagnose, treat, or replace advice from a qualified clinician.
Review status: Formula and automated QA completed June 21, 2026; independent professional review is pending. Next scheduled review: September 21, 2026.

Validation sources

Mifflin-St Jeor et al. (1990)
ACSM Guidelines

TDEE Calculator — Answer & Method

Calculate Total Daily Energy Expenditure based on BMR and activity level using Mifflin-St Jeor equation.

Formula: TDEE

TDEE = BMR × Activity Factor

BMR = Basal Metabolic Rate (kcal)

Example Calculation

BMR of 1600 with moderate activity (1.55): TDEE = 2,480 kcal/day.

Important limitation

This is an educational estimate, not a diagnosis or a substitute for professional medical advice.

Key Facts

TDEE includes BMR plus calories burned through activity and digestion.
The Mifflin-St Jeor equation is considered the most accurate BMR formula.

Sources & Validation

Mifflin-St Jeor et al. (1990)ACSM Guidelines

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Deterministic: YesAI-Generated Numbers: NoVerified: 2026-02-12

TDEE Calculator

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🔥 TDEE Calculator — Complete Guide

How TDEE Is Calculated

TDEE Components

Activity Multipliers (PAL Values)

TDEE Myths vs Facts

History of Metabolic Rate Estimation

Frequently Asked Questions

References & Further Reading

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TDEE Calculator

TDEE Calculator — Complete Guide

What Is TDEE?

TDEE & BMR Formulas

Calorie Goals by Objective

History of Energy Expenditure Science

Lavoisier — Father of Calorimetry

Harris-Benedict Equation Published

Mifflin-St Jeor Equation

Doubly Labeled Water Method

NEAT Discovery by Levine

IAEA DLW Database

Key Research & Data

BMR Equation Comparison Study (2005)

NEAT — The Hidden Calorie Burner

Daily Energy Expenditure Across the Lifespan

Metabolic Adaptation to Weight Loss

TDEE Myths vs. Facts

Frequently Asked Questions

References

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Methodology, sources & limitations

Validation sources

TDEE Calculator — Answer & Method

Formula: TDEE

Example Calculation

Important limitation

Key Facts

Sources & Validation

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See Also

Calorie Deficit Calculator

BMR Calculator

Macro Calculator

Calorie Deficit Calculator

TDEE Calculator

About This Calculator

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TDEE Explained: Total Daily Energy Expenditure

How Many Calories Do You Need? TDEE & BMR

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Best Free Calorie Calculator in 2026: 6 Tools

🔥 TDEE Calculator — Complete Guide

How TDEE Is Calculated

TDEE Components

Activity Multipliers (PAL Values)

TDEE Myths vs Facts

History of Metabolic Rate Estimation

Frequently Asked Questions

References & Further Reading

Related Calculators

Explore All Health & Fitness Calculators