TDEE Calculator — Maintenance Calories, BMR & Weight Goals
Estimate Your Total Daily Energy Expenditure
Your Total Daily Energy Expenditure (TDEE) is an estimate of how many calories your body uses over an average day. It combines the energy required to support basic physiological functions with the energy associated with daily movement, exercise, and processing food.
- BMR or resting energy expenditure
- Maintenance calories
- TDEE
- Estimated NEAT (daily movement)
- Estimated EAT (planned workouts)
- Estimated TEF (digestion)
- Calorie targets for weight loss
- Calorie targets for weight gain
- Lean-bulk and body-recomposition targets
- 12-week weight projections
- Results using multiple BMR equations
The calculator also lets you adjust activity level, daily steps, and structured workouts so the result reflects more than just age, height, weight, and sex.
Predictive equations provide estimates, not direct measurements. Their accuracy varies by equation, population, body composition and individual characteristics, so a calculated BMR or TDEE should be treated as a starting estimate rather than an exact metabolic measurement.
What Is TDEE?
TDEE means Total Daily Energy Expenditure. It is the estimated amount of energy your body uses during a full day.
TDEE
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BMR TEF Activity
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EAT NEAT
Exercise Daily movementNEAT can vary substantially between individuals because daily occupations, movement habits and other environmental and biological factors differ.
TDEE vs BMR
BMR and TDEE are not the same number.
BMR (Basal Metabolic Rate)
BMR is an estimate of the energy required to support essential physiological processes under resting conditions. For detailed isolated basal analysis, explore our BMR Calculator.
TDEE (Total Daily Energy Expenditure)
TDEE is broader because it includes activity and food-related energy expenditure in addition to resting energy expenditure.
For example, a person's calculator result might be: BMR: 1,740 kcal/day and TDEE: 2,797 kcal/day. The additional calories represent modeled expenditure associated with the person's activity and other components. This is why eating approximately your BMR is not the same as eating at maintenance.
How This TDEE Calculator Works
The calculator uses several defined stages:
1. Estimate resting energy expenditure
Choose one of the available BMR equations. The calculator supports seven methods: Mifflin-St Jeor, Katch-McArdle, Harris-Benedict, Revised Harris-Benedict, Cunningham, Schofield, and Owen. These equations are predictive models rather than direct measurements.
2. Apply the activity model
Select an activity level appropriate to your typical lifestyle. The calculator uses activity multipliers as planning assumptions. They should not be interpreted as exact physiological measurements.
3. Account for steps
Daily steps can provide an additional estimate of non-exercise movement.
4. Model workouts
Structured workouts contribute to estimated EAT. The calculator uses your workout frequency, workout duration, and body weight to estimate this component.
5. Model TEF
The calculator uses a simplified model for the thermic effect of food. TEF varies with food composition, energy intake and individual characteristics, so the calculator's value should be interpreted as a modeled estimate rather than a direct measurement.
6. Derive the displayed NEAT
NEAT = TDEE - BMR - EAT - TEF
Within this calculator, NEAT is presented as a residual component. This means the displayed NEAT value is calculated from the model. It is not a number measured from a wearable or laboratory test.
TDEE Calculator Example
Use the calculator's reference scenario: Age: 25, Sex: Male, Height: 5 ft 10 in, Weight: 165 lb, Activity: Moderately Active, Daily steps: 7,500, Workouts: 4 per week, BMR equation: Mifflin-St Jeor.
| Metric | Estimate | Description |
|---|---|---|
| BMR | 1,740 kcal/day | Resting basal expenditure from Mifflin-St Jeor |
| NEAT | 623 kcal/day | Modeled residual non-exercise physical activity |
| EAT | 154 kcal/day | Modeled exercise expenditure (4 sessions/wk, 45 min) |
| TEF | 280 kcal/day | Thermic effect of food (~10% modeling assumption) |
| Total TDEE | 2,797 kcal/day | Reconciliation: 1,740 + 623 + 154 + 280 = 2,797 |
1,740 + 623 + 154 + 280 = 2,797
So the component breakdown is internally consistent with the displayed TDEE.
What Is BMR?
Basal Metabolic Rate (BMR) represents the energy required for basic physiological functions. These include processes such as breathing, circulation, maintaining body temperature, supporting organs, and cellular activity. When evaluating general body stature alongside BMR, our BMI Calculator and Ideal Weight Calculator provide helpful reference points.
In practice, many nutrition calculators use predictive equations for resting energy expenditure rather than measuring BMR directly. The Mifflin-St Jeor equation, for example, was developed from a sample of 498 healthy adults whose resting energy expenditure was measured by indirect calorimetry.
These equations are useful estimates, but prediction error varies across populations and individuals.
The Seven BMR Equations
Mifflin-St Jeor
A widely used modern predictive equation for resting energy expenditure. Uses weight + height + age + sex. The original study compared the equation against indirect-calorimetry measurements in adults.
Katch-McArdle
Katch-McArdle uses fat-free mass, making it particularly useful when you have a reasonably reliable body-composition estimate from our Body Fat Calculator.
Harris-Benedict
The original Harris-Benedict equations are historical predictive equations for basal energy expenditure.
Revised Harris-Benedict
A later revision updated the original Harris-Benedict relationships using additional data.
Cunningham
Cunningham is another fat-free-mass-based equation and can be useful in athletic populations where lean mass is known.
Schofield & Owen
Schofield: Developed from a large dataset of measured BMR values and later contributed to the FAO/WHO/UNU energy-requirement framework.
Owen: Provides another predictive approach for resting energy expenditure.
Because each equation was developed using different datasets, variables and modeling assumptions. There is no universal formula that will produce the exact resting expenditure of every person.
NEAT, EAT, and TEF Explained
What Is NEAT?
NEAT stands for Non-Exercise Activity Thermogenesis. It describes energy expenditure from physical activity that is not formal exercise: walking around the house, standing, commuting, shopping, household work, occupational movement, changing posture, and fidgeting. Research shows that NEAT can differ dramatically between people of similar body size. The calculator models NEAT rather than measuring it directly.
What Is EAT?
EAT means Exercise Activity Thermogenesis. It represents the energy associated with structured exercise: running, cycling, swimming, resistance training, sports, and planned cardio sessions. The amount of energy used during exercise depends on body size, exercise type, duration, and intensity.
What Is TEF?
TEF means Thermic Effect of Food. It refers to the increase in energy expenditure associated with eating, digesting, absorbing and processing nutrients. TEF varies with meal energy content and macronutrient composition. This calculator uses a simplified model rather than calculating TEF from every food you eat.
Activity Levels and TDEE
The calculator provides activity multipliers such as:
| Activity | Multiplier | Description |
|---|---|---|
| Sedentary | 1.20 | Desk job, little to no deliberate exercise |
| Lightly Active | 1.375 | Light exercise or occupational movement 1–3 days/week |
| Moderately Active | 1.55 | Moderate exercise or sports 3–5 days/week |
| Very Active | 1.725 | Hard exercise or demanding physical labor 6–7 days/week |
| Competitive Athlete | 2.10 | Professional training 2+ sessions/day or heavy endurance load |
These values are calculator estimation parameters, not measurements of an individual's actual activity expenditure. For example, two people classified as “moderately active” may have very different occupations, step counts, exercise routines, commuting patterns, and movement habits. Therefore, select the activity level that best represents your typical routine rather than choosing the highest category simply because you exercise several times per week.
Steps are one useful indicator of daily movement. Walking more generally increases physical activity, but converting a specific number of steps into an exact calorie expenditure is difficult because calorie cost depends on body weight, walking speed, stride length, terrain, duration, and individual biomechanics. This calculator therefore treats step-related expenditure as a modeled adjustment, not a laboratory measurement. Also avoid adding smartwatch “active calories” directly on top of a TDEE result without considering whether the activity has already been included in the calculator's assumptions.
Maintenance Calories & Goal Targets
Maintenance Calories
Your estimated maintenance calories are approximately equal to your modeled TDEE (e.g. 2,797 kcal/day). It is not a guarantee that your body weight will remain identical every day. Actual weight fluctuates because of water, glycogen, digestive contents, sodium, hormonal changes, and activity variations. For general daily energy planning, compare with our Calorie Calculator.
Calories for Weight Loss
Calorie Intake < TDEE | 2,797 - 2,297 = 500 kcal/day
That is a useful mathematical scenario. It should not be interpreted as a guarantee of a particular weekly weight-loss rate. NIDDK's weight-modeling work explains why the simple fixed-calorie approach can overpredict long-term weight loss as energy expenditure and body weight change over time.
Calories for Weight Gain
Calorie Intake > TDEE | 2,800 - 2,500 = 300 kcal/day
A moderate surplus may be useful for people deliberately trying to gain body mass, but the appropriate amount depends on the person's goals and response. For targeted macronutrient partitioning, see our Macro Calculator.
What Is a Lean Bulk?
A lean bulk generally means trying to increase body mass while limiting unnecessary fat gain: Resistance training + sufficient protein + controlled calorie surplus. To dial in daily amino-acid targets, reference our Protein Calculator.
Body recomposition refers broadly to changing body composition by reducing fat while maintaining or increasing lean mass. This is more complex than simply setting one calorie number. Results depend on training, protein intake, energy balance, sleep, recovery, starting body composition, and training experience. The calculator's recomposition target is therefore a planning estimate, not a guarantee of simultaneous fat loss and muscle gain.
The 3,500-Calorie Rule & 12-Week Projections
The traditional rule says: 3,500 kcal ≈ 1 lb of body weight. This is useful as a simple educational approximation, but it should not be treated as an immutable biological law. Weight loss changes energy expenditure and body composition over time, so the actual trajectory is not perfectly linear. NIDDK developed the Body Weight Planner specifically to model these dynamic changes, noting that simple fixed-calorie calculations can overestimate long-term weight loss.
Understanding the 12-Week Projection
The calculator can show how body weight could theoretically change under a selected calorie deficit or surplus. A simple projection assumes the selected energy difference remains approximately constant (e.g. 500 kcal/day deficit over 12 weeks). The resulting line is a mathematical scenario. It does not account perfectly for changing body weight, changing resting expenditure, changing spontaneous activity, changing appetite, changes in exercise, water-weight fluctuations, or adherence.
How to Find Your Real-World Maintenance Calories
A practical method is to treat your TDEE calculation as a starting hypothesis:
If your weight is consistently increasing when you expected maintenance, your actual expenditure may be lower than the original estimate or your intake may be higher than recorded. If your weight is consistently decreasing, the opposite may be true. This process turns the calculator from a one-time answer into a starting point that can be calibrated against real-world observations.
Consider two people with identical age, sex, height, and weight. Their TDEE can still differ because their daily lives differ. One person might work at a desk, walk 4,000 steps, and exercise twice weekly, while another might work on their feet, walk 12,000 steps, and train five times weekly. Their resting energy expenditure may be similar, but their activity expenditure can be very different. NEAT research specifically demonstrates large differences in non-exercise activity among individuals.
Accuracy, Athletes & Limitations
Is a TDEE Calculator Accurate?
It can be useful without being exact. That distinction matters. A predictive equation may perform reasonably well on average while still being inaccurate for a specific person. The final TDEE estimate introduces another layer of uncertainty because activity, steps, exercise and TEF are modeled. Therefore, a good interpretation is: Estimated TDEE = starting point, not measured daily calorie expenditure.
TDEE for Athletes
Athletes can have substantially different energy requirements from sedentary people. Training load changes with sport, volume, duration, intensity, competition schedule, recovery, and body composition. An athlete calculator mode provides a useful starting range, but high-level athletes often require individualized planning. The Cunningham equation and other fat-free-mass-based methods may be particularly useful in some athletic contexts.
TDEE and Fitness Trackers
Fitness watches and activity trackers provide estimates. A common mistake is combining TDEE calculator + smartwatch active calories + exercise calories from another calculator without checking whether the same activity has been counted more than once. The safest approach is to understand the methodology behind each number before combining them.
TDEE and Metabolism
Your metabolism is not a single fixed daily number. Energy expenditure changes with body size, body composition, physical activity, food intake, environmental conditions, and adaptation to changes in energy balance. That is why a TDEE number should be considered a model of average expenditure under specific assumptions, not a permanent metabolic identity.
This calculator is intentionally practical rather than laboratory-based. It cannot directly measure resting metabolic rate, individual NEAT, exact exercise calorie expenditure, exact thermic effect of food, or daily metabolic adaptation. A laboratory measurement such as indirect calorimetry can measure resting energy expenditure more directly, while research methods such as doubly labeled water can quantify free-living total energy expenditure. Predictive calculators trade that precision for convenience and accessibility. The calculator's value is therefore in giving you a structured, reproducible starting estimate.
Frequently Asked Questions
Scientific Methodology Note
This calculator combines established predictive equations with practical activity assumptions. The Mifflin-St Jeor equation was derived from measured resting energy expenditure using indirect calorimetry. NEAT is a recognized component of energy expenditure and can vary substantially between people because of differences in movement and lifestyle. TEF varies with meal energy content, macronutrient composition and individual factors, so a simplified calculator must treat it as a modeled component rather than an exact measurement. For long-term weight-change modeling, NIDDK research demonstrates why a static calorie-to-weight relationship can be insufficient and why energy expenditure should be considered dynamically.
This calculator is for educational and planning purposes. It estimates energy expenditure using predictive equations and activity assumptions; it does not measure metabolism or provide medical advice. Individual calorie needs can differ substantially. People with medical conditions, pregnancy, eating disorders, or specialized athletic or nutrition needs should consult a qualified healthcare professional.