TDEE Calculator
Use this free TDEE Calculator to estimate your maintenance calories, daily energy expenditure, and calorie deficit targets based on your body weight, activity level, and established metabolic equations including Mifflin-St Jeor and Katch-McArdle.
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💡 Sustainability bar shown below each plan - higher is better for long-term adherence.
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TDEE Calculator: Calculate Your Maintenance Calories for Weight Loss
Most calorie advice online treats everyone the same. Eat 2,000 calories. Done. But that number means nothing if you weigh 65 kg or 110 kg, sit at a desk all day, or carry significantly more muscle than average. Your body has its own energy budget, and until you know what that budget is, hitting your goals stays a guessing game.
That is where your Total Daily Energy Expenditure comes in.
TDEE is the total number of calories your body burns in a full 24 hours. Not just during a workout, but everything: breathing, digestion, walking to the kitchen, carrying groceries, fidgeting at your desk. It is the most meaningful calorie number for your body, and it is the foundation of any realistic fat loss or muscle-building plan.
When you eat below your TDEE, you lose weight. When you eat above it, you gain. When you match it, your weight stays stable. This is your maintenance calorie level. Getting this number right is what separates smart calorie planning from random restriction that eventually fails.
Your TDEE depends on several things that are unique to you: your current weight, height, age, sex, how much muscle you carry, and how active you are day to day. A 38-year-old male at 90 kg who works from home and walks occasionally burns very different calories than someone the same age and weight who coaches five training sessions a week.
Generic advice skips all of that. A good TDEE calculator does not.
What Is TDEE?
TDEE stands for Total Daily Energy Expenditure. It represents every calorie your body burns across an entire day, broken into four distinct parts.
Basal Metabolic Rate (BMR) is the largest piece, typically 60 to 75 percent of your total burn. This is the energy your body uses just to keep you alive: heart beating, lungs breathing, organs functioning, cells repairing. Even if you stayed in bed all day and did nothing, your body would still burn this amount.
Non-Exercise Activity Thermogenesis (NEAT) covers everything physical that is not a structured workout, like walking, standing, gesturing, cleaning, and taking stairs. This part varies a lot between people and is often the biggest reason two people with similar bodies have different calorie needs.
Exercise Activity Thermogenesis (EAT) covers deliberate training sessions: gym sessions, runs, cycling, sports. For most people, this is smaller than NEAT unless they train daily at high intensity.
Thermic Effect of Food (TEF) is the energy your body uses to digest, absorb, and process what you eat. On average, this accounts for around 10 percent of total calorie intake. Protein has the highest thermic effect, with roughly 20 to 30 percent of its calories going toward digestion alone.
Add all four together and you get your TDEE. This number determines whether you lose, maintain, or gain weight.
TDEE vs BMR: What Is the Difference?
People mix these up constantly, and it causes real problems.
BMR is what you burn doing nothing. It is a theoretical baseline, the calories your body needs to run its essential biological functions if you never moved at all. It does not account for a single step you take, a single workout you do, or a single meal you digest.
TDEE is what you actually burn living your life. It takes your BMR and multiplies it upward based on how active you are. For a sedentary person, TDEE might be around 1.2 times their BMR. For a competitive athlete training twice a day, it can reach 2.0 times their BMR or higher.
This difference matters a lot in practice. Someone with a BMR of 1,700 kcal who is lightly active might have a TDEE closer to 2,100 kcal. If they eat 1,700 kcal thinking they are eating at maintenance, they are actually running a 400 kcal daily deficit without realizing it. Over time, that can cause muscle loss, fatigue, and hormonal disruption.
Always work from your TDEE, not your BMR.
| Metric | What It Measures | Use For |
|---|---|---|
| BMR | Calories burned at complete rest | Understanding your metabolic baseline |
| TDEE | Total calories burned per day (real life) | Setting calorie targets for any goal |
| Maintenance Calories | Calories to maintain current weight | Starting point before applying a deficit or surplus |
How Is TDEE Calculated?
The BellyZero TDEE calculator uses a two-step process: first calculate BMR, then multiply by an activity factor.
STEP 1 – CALCULATE BMR
Three formulas are widely used in research and clinical practice:
Mifflin-St Jeor is the most commonly recommended formula for people of average body composition. It uses weight, height, age, and sex.
Harris-Benedict (Revised) is an older formula that still works well for most populations.
Katch-McArdle is the most accurate formula for people who know their body fat percentage. Instead of using total body weight, it uses lean body mass, which is the amount of weight that is not fat. This makes it more precise for people who carry above-average muscle or have a known body fat percentage.
| Formula | Inputs | Best For |
|---|---|---|
| Mifflin-St Jeor | Weight, height, age, sex | Most people (general use) |
| Harris-Benedict | Weight, height, age, sex | General population, broad estimate |
| Katch-McArdle | Lean body mass (requires body fat %) | Higher accuracy with body composition data |
When you enter your body fat percentage into the BellyZero calculator, it automatically switches to Katch-McArdle, the same approach used in research settings for more precise energy expenditure estimates. You can also check your body fat with the Body Fat Calculator or find your lean body mass with the Lean Body Mass Calculator.
STEP 2: Apply the Activity Multiplier
Once BMR is calculated, multiply it by a factor based on your activity level:
| Activity Level | Description | Multiplier |
|---|---|---|
| Sedentary | Desk job, minimal movement | × 1.2 |
| Lightly Active | 1–3 exercise sessions/week | × 1.375 |
| Moderately Active | 3–5 sessions/week | × 1.55 |
| Very Active | 6–7 hard sessions/week | × 1.725 |
| Athlete | Physical job + daily training | × 1.9 |
The Katch-McArdle BMR Formula
Katch-McArdle BMR
BMR = 370 + (21.6 × Lean Body Mass in kg)
Where Lean Body Mass = Total Weight × (1 − Body Fat Fraction)
TDEE Formula
TDEE = BMR × Activity Multiplier
How Accurate Are TDEE Calculators?
This is the most important section on this page, and most calculator sites skip it entirely.
TDEE calculators give you estimates. Good ones, but estimates. Research shows that even the best BMR formulas carry a margin of error of around 10 percent for most people. That means a calculator result of 2,200 kcal could reflect a true TDEE anywhere from roughly 1,980 to 2,420 kcal.
Several factors drive this variation:
Activity level self-reporting is the biggest source of error. People almost always overestimate how active they are. Someone who exercises three times a week but sits for most of the remaining hours is almost certainly more sedentary than they think.
Metabolism varies between people beyond what any formula can capture. Hormones, gut microbiome, sleep quality, stress, medications, and genetics all influence how many calories your body actually uses. A calculator cannot measure any of these.
Metabolic adaptation means your TDEE changes as you lose or gain weight. As your body gets lighter, it burns fewer calories, and it also gets more efficient at using energy. This is a response to calorie restriction that researchers have documented extensively, including in the well-known NIH Biggest Loser study.
The right way to use a TDEE calculator is as a starting point, not a final answer. Use the number to set your initial calorie target, then track your actual intake and body weight for two to three weeks. If you lose weight faster than expected, you likely have a higher true TDEE. If you are not losing despite eating at a deficit, you may be overestimating your activity or underestimating your intake.
The calculator points you in the right direction. Your results over time give you the right number.
How Many Calories Should You Eat to Lose Weight?
To lose weight, you need to eat fewer calories than your TDEE. That creates a calorie deficit. But the size of that deficit matters more than most people realize.
Fat contains approximately 7,700 kcal per kilogram. Burning one kilogram of pure fat requires a cumulative deficit of 7,700 kcal, which works out to about 1,100 kcal per day for a week. That is not realistic or safe for most people. Real-world fat loss also involves some water loss and minor muscle tissue changes, so actual results vary from the pure math.
Research supports a deficit of 300 to 500 kcal per day as the sustainable sweet spot for most people. This produces roughly 0.3 to 0.5 kg of weight loss per week, slow enough to preserve most lean muscle mass and fast enough to see meaningful progress.
Eating below your BMR is not recommended. Your BMR represents the bare minimum your body needs to function. Consistently eating below it risks muscle loss, hormonal disruption, nutrient deficiencies, and metabolic slowdown. The BMR Calculator can help you understand exactly where your floor is.
Aggressive deficits of 750 kcal or more per day produce faster scale results, but they also speed up muscle loss, increase hunger and cravings, hurt recovery and training performance, and sharply raise the odds of rebound weight gain once the diet ends.
Best Calorie Deficit for Sustainable Fat Loss
| Deficit Type | Daily Deficit | Weekly Loss | Muscle Risk | Best For |
|---|---|---|---|---|
| Gentle | ~250 kcal | ~0.23 kg | Very low | Beginners, active trainers, long-term adherence |
| Moderate | ~500 kcal | ~0.45 kg | Low–moderate | Most people; best balance of results and sustainability |
| Aggressive | ~750+ kcal | ~0.65–0.9 kg | High | Short-term only; requires high protein + training |
The moderate 500 kcal deficit is the most researched and most commonly recommended starting point. It keeps you well above BMR in most cases, maintains reasonable training performance, and avoids the aggressive hunger and fatigue that comes with steeper cuts.
If you train with weights three or more times a week and keep protein high, a moderate deficit produces very little muscle loss alongside fat loss, which is the combination most people actually want.
Use the Calorie Deficit Calculator to find your specific cut targets, and pair it with the Macros Calculator to set up your full macronutrient targets.
Can You Lose Belly Fat With a Calorie Deficit?
Yes, but not by targeting your belly specifically. Spot reduction is a persistent myth with no meaningful scientific support. You cannot choose where your body loses fat by doing crunches or specific exercises aimed at one area.
A calorie deficit reduces total body fat. As overall body fat drops, visceral fat, which is the metabolically active fat stored around your abdominal organs, decreases alongside it. Research consistently shows that visceral fat responds well to calorie restriction combined with regular physical activity.
Several things speed up belly fat reduction specifically:
Daily walking. Studies link 7,000 to 10,000 steps per day with significantly lower visceral fat, independent of structured exercise. Walking is an underrated fat loss tool because it is sustainable, easy to maintain, and does not increase appetite the way intense cardio sometimes does.
Resistance training. Strength training 2 to 3 times per week preserves lean muscle mass during a deficit, raises resting metabolic rate over time, and specifically targets visceral fat reduction in research involving abdominal obesity.
Quality sleep. Poor sleep raises cortisol and ghrelin, hormones that promote fat storage (particularly visceral) and increase hunger. Consistently sleeping 7 to 9 hours per night matters a lot for people trying to lose belly fat.
Stress management. Chronically elevated cortisol from stress directly promotes visceral fat buildup, independent of calorie intake. This is not a minor factor.
High protein intake. Protein supports satiety, preserves lean mass, and has a higher thermic effect than carbohydrates or fat, all of which matter during belly fat reduction in a deficit.
Limiting alcohol and added sugar. Both are specifically linked to liver fat and visceral fat buildup beyond their raw calorie contribution.
Why Protein Intake Matters During a Deficit
When you eat less than your TDEE, your body pulls energy from stored fat, but also, to some degree, from muscle tissue. How much muscle you lose depends largely on two things: how large your deficit is, and how much protein you eat.
Protein is the primary tool for muscle preservation during fat loss. Research consistently shows that higher protein intakes during a calorie deficit protect lean body mass significantly better than standard protein levels.
The current evidence-based recommendation for people in a calorie deficit who train with weights is 1.6 to 2.2 grams of protein per kilogram of body weight per day. During aggressive deficits or for people with higher starting body fat, the higher end of this range is more protective.
Protein also has a practical advantage: it is the most filling macronutrient. Higher protein intakes reduce hunger, which makes sticking to a calorie deficit significantly easier in practice.
Beyond preservation and satiety, protein supports recovery from training, maintains immune function, and contributes to the thermic effect of food, all meaningful during a fat loss phase.
Use the Protein Intake Calculator to find your specific protein targets based on your weight, goal, and activity level.
Why Your TDEE Changes Over Time
Your TDEE is not a fixed number. It shifts, sometimes significantly, as your body changes.
Weight loss itself reduces TDEE. As you weigh less, your body has less mass to maintain and carry through daily movement. A 90 kg person and an 80 kg version of the same person have meaningfully different energy requirements, even with identical activity.
Metabolic adaptation adds another layer. When you consistently eat in a deficit, your body gets more efficient at using energy. Non-exercise movement decreases (often without conscious awareness), digestion becomes slightly more efficient, and hormonal signals shift. This is not a myth. Researchers have documented it extensively as a physiological response to calorie restriction.
Muscle loss lowers TDEE. Muscle is metabolically active tissue that requires energy to maintain even at rest. Losing muscle during a deficit shrinks your BMR and, therefore, your TDEE. This is a primary reason why high protein intake and resistance training are non-negotiable during fat loss phases.
Aging gradually reduces BMR. After age 25, BMR declines roughly 1 to 2 percent per decade. This is manageable. Resistance training is the most effective way to slow it down. But it does mean a TDEE calculation from five years ago is no longer accurate.
Changing activity levels shift TDEE substantially. Starting a new training program, changing jobs, recovering from injury, or simply becoming more sedentary all alter your daily energy expenditure.
For all of these reasons, recalculate your TDEE every time you lose or gain 5 kilograms, or any time your activity level changes meaningfully.
Common TDEE Calculator Mistakes
Choosing an activity level that is too high. This is the most common mistake. Most people select “moderately active” when their real average is closer to “lightly active.” When in doubt, choose the lower category and adjust up based on real-world results.
Eating at or below BMR. BMR is not a calorie target. It is the floor below which you should not go for extended periods. Eating at BMR level ignores all the energy you burn through movement and daily activity, and puts you at risk of muscle loss and metabolic slowdown.
Expecting perfect precision. A TDEE number from a calculator is a starting estimate. Treating it as exact leads to frustration when results do not match predictions. Use it as a hypothesis and refine it based on 2 to 3 weeks of real data.
Ignoring protein. Hitting a calorie target but eating too little protein during a deficit means losing muscle alongside fat. You will get smaller on the scale, but not build better body composition.
Crash dieting based on the result. Seeing a large TDEE and immediately slashing calories by 1,000 or more per day to speed results almost always backfires. Aggressive restriction increases hunger, hurts training, and triggers adaptive metabolic responses that make the deficit less effective over time.
Setting it once and never updating it. Body weight, body composition, and activity levels all change. A TDEE calculated at 98 kg and a sedentary lifestyle is not accurate at 88 kg and three training sessions per week.
Inconsistent tracking. Estimating calorie intake rather than measuring it introduces enough error to cancel out the value of a precise TDEE calculation. Track accurately for at least two to four weeks before drawing conclusions.
Also check: Water Intake Calculator and Smart BMI Calculator for a more complete picture of your health metrics.
TDEE Formulas Reference
Mifflin-St Jeor BMR
Men: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5
Women: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161
Katch-McArdle BMR
BMR = 370 + (21.6 × Lean Body Mass in kg)
LBM = Total Weight × (1 − Body Fat %)
TDEE
TDEE = BMR × Activity Multiplier (1.2 to 1.9)
Calorie Deficit Target
Target Calories = TDEE − Deficit (250 to 500 kcal recommended)
The Bottom Line On Our Free TDEE Calculator
Understanding your TDEE changes how you approach nutrition. It takes the guesswork out of calorie planning and replaces it with a rational, personalized starting point, one built around your actual body and actual activity level, not a generic population average.
Fat loss does not require suffering, starvation, or extreme willpower. It requires a moderate calorie deficit, enough protein to protect your muscle, some form of regular physical activity, and enough consistency to give your body time to respond.
Your progress will not be a straight line. Weight fluctuates daily because of water, food volume, and hormonal cycles. The trend over weeks matters, not the number on any single morning.
Recalculate when your weight or activity changes meaningfully. Update your targets. Stay above your BMR. Keep protein high. Move daily. Sleep well.
That combination, a realistic deficit, adequate protein, resistance training, and time, is what works. Not crash diets, not extreme restriction, not transformation challenges with before-and-after photos taken a week apart.
The calculator gives you the number. Consistency gives you the result.
Frequently Asked Questions
What is a good calorie deficit for fat loss?
A deficit of 300 to 500 kcal per day is the evidence-based sweet spot for most people. This produces roughly 0.3 to 0.5 kg of fat loss per week while preserving muscle and remaining sustainable over months rather than days.
How accurate is a TDEE calculator?
Most validated TDEE calculators fall within 10 to 15 percent of your actual energy expenditure. This is accurate enough to be a reliable starting point. Treat the result as an estimate, track your real-world results for two to three weeks, and adjust your intake based on what your body actually does.
Is TDEE the same as maintenance calories?
Yes. Your TDEE is your maintenance calorie level, the amount of food energy that keeps your weight stable. Eating at TDEE means your intake matches your output, producing no net weight change.
Should I eat below my BMR?
No. Eating at or below your BMR for extended periods risks muscle loss, hormonal disruption, nutrient deficiencies, and metabolic slowdown. BMR represents your body's bare survival energy requirement. Your calorie intake should always sit above it.
How often should I recalculate my TDEE?
Recalculate every time your weight changes by 5 kilograms, or any time your activity level changes meaningfully. As you lose weight, your TDEE decreases, which means your original calorie target may no longer produce a deficit.
Can I lose fat without losing muscle?
You can minimize muscle loss significantly with the right approach: eat a moderate deficit (not aggressive), consume 1.6 to 2.2 g of protein per kg of body weight, and train with weights 2 to 3 times per week. Losing fat with minimal muscle loss is achievable. Losing fat while gaining muscle simultaneously is possible for beginners but uncommon in experienced trainees.
What activity level should I choose?
Be conservative. Most people who think they are moderately active are, on average, lightly active once all sedentary hours are counted. If you work a desk job and exercise three times per week, lightly active is usually the more accurate choice. Choose the lower level when unsure and adjust up if your real-world results suggest a higher TDEE.
Why did my weight loss slow down?
As you lose weight, your TDEE decreases, so your original calorie deficit shrinks or disappears. Your body also adapts metabolically to calorie restriction over time. Recalculate your TDEE, ensure your protein intake remains high, and consider adding a brief diet break before resuming your deficit.
Does muscle increase TDEE?
Yes. Muscle tissue is metabolically active. It requires energy just to maintain, even at rest. Every additional kilogram of lean muscle you carry raises your BMR slightly, which raises your TDEE. This is why resistance training is the single most reliable way to raise your metabolic rate long-term.
How many calories should I eat to lose belly fat?
There is no belly-specific calorie target. Fat loss is systemic. You lose it from your whole body, and visceral belly fat responds well to an overall calorie deficit combined with high protein intake, resistance training, quality sleep, and daily movement. A 300 to 500 kcal daily deficit below your TDEE is the recommended starting point for most people.
For informational and educational purposes only. All content on BellyZero, including articles, calculators, health tools, templates, and recipes, is intended to provide general health information. It does not constitute medical advice, a clinical diagnosis, or a substitute for professional healthcare guidance.
Results generated by BellyZero calculators and tools are estimates based on population-level formulas and standard reference ranges. They do not account for your full medical history, individual physiology, existing health conditions, or medications. Results may not apply to pregnant women, children, competitive athletes, or individuals with chronic illness.
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Written By: Vikas Arora Updated: May 2026