What is TDEE?
TDEE (Total Daily Energy Expenditure) is the number of calories your body burns in 24 hours, including everything from heartbeats to gym sessions. Knowing your TDEE turns weight management from guesswork into math: eat below TDEE to lose fat, at TDEE to maintain, above TDEE to build muscle.
By this calculator, a 30-year-old woman who is 5'4", 130 lb and sedentary burns about 1,554 calories a day; a 30-year-old man who is 6'2", 200 lb and very active burns about 3,341. The inputs that drive it are age, sex, weight, height and activity level. Lean body mass, everyday movement and the thermic effect of food matter too, though the equation doesn't measure them directly.
A common rule of thumb says 3,500 calories equal about 1 pound of body weight, so a daily gap of 500 calories would move you about 1 pound a week. Treat that as rough. NIH research on energy balance (Hall and colleagues, Lancet 2011) found that body weight responds slowly to a lasting change in intake, with a half-time of about a year, because energy expenditure adapts as weight changes. So use the calculator for a starting figure, then track your weight for a few weeks and adjust from what the scale shows.
BMR vs TDEE, what's the difference?
BMR (Basal Metabolic Rate) is the number of calories your body burns at rest just keeping you alive, heart beating, lungs breathing, brain functioning. TDEE (Total Daily Energy Expenditure) is BMR plus all your activity: walking, exercise, fidgeting, even digesting food.
BMR (Mifflin-St Jeor, 1990)
Men: 10 × kg + 6.25 × cm − 5 × age + 5
Women: 10 × kg + 6.25 × cm − 5 × age − 161
TDEE = BMR × activity multiplier (1.2–1.9, a common convention)
Eat at TDEE and your weight should hold roughly steady. Eat below it and weight falls; eat above it and weight rises. How fast is harder to predict than the rule of thumb suggests, so judge by the trend on your scale rather than the weekly figure.
The 4 components of TDEE
Your daily energy burn breaks down into four parts. Understanding each helps you target the right one to boost (or accept) your TDEE.
| Component | Description |
|---|---|
| BMR / RMR | Basal/resting metabolic rate, keeps you alive at rest. Roza and Shizgal (1984) found it tracks the size of the body's metabolically active tissue. |
| TEF | Thermic Effect of Food, calories burned digesting. Highest for protein, lowest for fat. |
| EAT | Exercise Activity Thermogenesis, formal workouts. |
| NEAT | Non-Exercise Activity Thermogenesis, walking, fidgeting, standing, gardening, posture. Hugely variable. |
Because TDEE here is BMR times a multiplier, BMR makes up between 53% (extra active) and 83% (sedentary) of the TDEE this calculator shows. The rest is everything else on the list. Everyday movement is the part that differs most between people: two people with the same BMR and the same gym routine can burn quite different totals if one walks, stands and takes the stairs far more than the other.
Step-by-step TDEE calculation example
Here is the calculator's own arithmetic for a 35-year-old male, 5'10" (177.8 cm), 180 lbs (81.6 kg), moderately active, goal: lose 1 lb/week, high-protein macro split.
Step 1, BMR (Mifflin-St Jeor, male): 10×81.647 + 6.25×177.8 − 5×35 + 5 = 816.47 + 1,111.25 − 175 + 5 = 1,757.72, shown as 1,758 cal/day
Step 2, TDEE: 1,757.72 × 1.55 (moderately active) = 2,724 cal/day
Step 3, Goal target: 2,724 − 500 (1 lb/week by the rule of thumb) = 2,224 cal/day
Step 4, Macro split (high-protein 35/40/25), on the unrounded target of 2,224.5:
• Carbs: 35% = 778.6 cal ÷ 4 = 194.6 → 195g
• Protein: 40% = 889.8 cal ÷ 4 = 222.4 → 222g (1.23 g per lb of body weight)
• Fat: 25% = 556.1 cal ÷ 9 = 61.8 → 62g
After a few weeks at 2,224 cal/day, weigh yourself regularly and follow the weekly average, which smooths out day-to-day water swings. If the trend is slower than you want, lower the target a little; if it is faster, or you feel drained, raise it. The calculator gives a starting estimate; your scale tells the truth.
Activity multipliers (be honest)
| Level | Multiplier | Description |
|---|---|---|
| Sedentary | ×1.2 | Desk job, little or no exercise |
| Lightly active | ×1.375 | Light exercise 1–3 days/week |
| Moderately active | ×1.55 | Moderate exercise 3–5 days/week |
| Very active | ×1.725 | Hard exercise 6–7 days/week |
| Extra active | ×1.9 | Hard daily exercise + physical job or 2× training |
These multipliers are a common convention, not an official standard, and the level you pick moves the result more than any other input. If you're not sure, pick the lower level; you can move up after a few weeks of tracking actual weight change.
BMR formulas compared
Three commonly used BMR formulas, where they come from and what they need:
| Formula | Published | Inputs | Note |
|---|---|---|---|
| Mifflin-St Jeor | Mifflin, St Jeor et al., Am J Clin Nutr, 1990 | Weight, height, age, sex | Used by this calculator |
| Harris-Benedict (revised) | Re-evaluated by Roza and Shizgal, Am J Clin Nutr, 1984 | Weight, height, age, sex | Roza and Shizgal report a precision of ±14% in well-nourished people |
| Katch-McArdle | Textbook equation (McArdle, Katch and Katch, Exercise Physiology) | Lean body mass (needs body-fat %) | Not an official equation |
Our calculator uses Mifflin-St Jeor, published in 1990 from measurements of healthy adults, because it needs only weight, height, age and sex. If you know your body-fat percentage from a reliable measurement, Katch-McArdle gives a second estimate built on lean body mass instead; it accounts for the fact that lean tissue burns more energy than fat tissue.
Katch-McArdle formula (textbook):
BMR = 370 + (21.6 × Lean Body Mass in kg)
Where: LBM = Total weight × (1 − body fat %). E.g., 200 lb at 15% BF = 170 lb LBM = 77.11 kg → BMR = 370 + (21.6 × 77.11) = 2,036 cal/day.
Setting calorie targets
The goals below are sized with the 3,500-calories-per-pound rule of thumb, so the weekly column is a rough guide that tends to overstate loss as the months go on. For loss goals the calculator won't set a target below 1,200 calories for women or 1,500 for men. That floor is this calculator's own design choice, a common convention rather than an official safe minimum; when your TDEE is close to it, the deficit shown shrinks to fit.
| Goal | Calorie Adjustment | Weekly Change (rule of thumb) |
|---|---|---|
| Aggressive loss (−2 lb/wk) | -1000 cal/day | -2 lb |
| Weight loss (−1 lb/wk) | -500 cal/day | -1 lb |
| Mild loss (−0.5 lb/wk) | -250 cal/day | -0.5 lb |
| Maintain | 0 cal/day | 0 lb |
| Mild gain (+0.5 lb/wk) | +250 cal/day | +0.5 lb |
| Weight gain (+1 lb/wk) | +500 cal/day | +1 lb |
What CDC says about pace: people who lose weight at a gradual, steady pace, about 1 to 2 pounds a week, are more likely to keep it off than people who lose it more quickly. The loss doesn't need to be large to matter: CDC's example is that 5% of body weight for a 200-pound person is 10 pounds, a change that could lower the risk of some chronic diseases such as heart disease, prediabetes and type 2 diabetes. Source: CDC, Steps for Losing Weight.
Macro splits: which to pick
| Split | C / P / F | What it does | Protein in MedlinePlus range? |
|---|---|---|---|
| Balanced | 50/25/25 | Carbs the largest share, protein and fat equal | Yes |
| High protein | 35/40/25 | Protein the largest share | No, above 35% |
| Low carb | 25/35/40 | Fat the largest share, carbs cut back | Yes |
| Keto | 5/25/70 | Very little carbohydrate, most calories from fat | Yes |
| Endurance | 60/20/20 | Carb-heavy, for long training sessions | Yes |
| Zone (40/30/30) | 40/30/30 | The ratio used by the Zone Diet | Yes |
Carbs and protein = 4 cal/g · Fat = 9 cal/g, the general factors FDA uses for nutrition labels (21 CFR 101.9). The presets are this calculator's own; none is an official diet.
How much protein do I really need?
MedlinePlus (from the National Library of Medicine) gives the recommended protein intake for healthy adults as 10% to 35% of total calories. Every preset in this calculator falls inside that range except High protein (40%). The result panel also shows your protein in grams per pound of body weight, so you can set it beside any figure your doctor or dietitian has given you.
In grams: on the 2,224-calorie target from the worked example, the high-protein preset gives 222 g of protein a day (40% of calories), while the balanced preset gives 139 g (25%). Source for the range: MedlinePlus, Protein in diet.
Carbs vs fat: how to split the rest
After setting protein, the remaining calories split between carbs and fat. Both belong in a normal diet, and the ratio is largely a matter of preference, lifestyle, and training type. Here is how the presets divide it:
- Higher-carb: Endurance (60% carbs) and Balanced (50% carbs). Carbohydrate supplies half or more of the calories.
- Middle: Zone (40% carbs) and High protein (35% carbs). The three macros sit closer to even.
- Lower-carb: Low carb (25% carbs) and Keto (5% carbs). Fat is the largest share.
For weight change, the calorie total is what counts; the split is about what you can keep up. Pick the ratio that fits how you like to eat and train, and check it against the protein range above.
How to track calories accurately
Intake is easy to underestimate. Common culprits: drinks, oils, condiments, "tastes" while cooking, restaurant portions. Get tracking dialed in:
- Get a food scale. Weigh everything in grams for the first few weeks. Cup measurements are a poor guide for foods like rice, oats and peanut butter.
- Use MyFitnessPal, Cronometer, or LoseIt. Prefer verified entries; ones submitted by other users can be wrong.
- Pre-log your day each morning. Plan meals in advance. Reduces "I'll figure it out later" decisions that derail you.
- Track liquid calories. Coffee creamer, juice, smoothies and alcohol all count.
- Don't forget oils. Fat carries 9 calories per gram against 4 for carbs and protein, so a drizzle adds up.
- Restaurant meals are the hardest to judge. Use posted calorie counts where a restaurant has them.
- Build in a small buffer. Aim a little under your target to absorb logging errors.
- Once you know your portions, you can graduate to "eyeballing" the ones you've weighed many times.
Adjusting your plan based on results
The calculator gives a starting point. Your scale + waist measurement tell you the truth. Adjust based on actual progress:
| After a few weeks of consistent tracking | Adjustment |
|---|---|
| Weight steady, goal was loss | Lower the target a little |
| Weight dropping faster than CDC's 1–2 lb/wk | Raise the target a little |
| Weight gaining when goal was maintain | Lower the target a little |
| Weight steady on a bulk | Raise the target a little |
| Gaining waist circumference faster than chest/arms | Lower the target; bulk too aggressive |
Use a weekly average weight (Mon-Sun) to smooth out water fluctuations. Daily weights move with sodium, glycogen, hydration and hormones. Track the trend, not the number.
Metabolic adaptation and diet breaks
Metabolic adaptation is the body's response to a sustained calorie deficit. As you lose weight you need less energy, and NIH research (Hall and colleagues, 2011) models how energy expenditure adapts during weight loss. The same calories that produced a loss at first then produce a smaller one, which is why progress slows and people "plateau."
Solutions:
- Recalculate TDEE as your weight changes: by the Mifflin-St Jeor equation alone, 30 lb (13.6 kg) less lowers BMR by about 136 cal/day, or 211 at the moderately active multiplier of 1.55. Adaptation can add to that.
- Diet breaks: some people take a planned spell at maintenance calories during a long diet to make it easier to stick with. No official guidance says how long or how often.
- Increase NEAT: walking, walking meetings, a standing desk, the stairs.
- Don't stay in a deficit indefinitely. Plan maintenance phases between cuts.
Cutting (fat loss) playbook
A cutting phase, step by step:
- Pick a moderate deficit. The calculator's loss goals run from 250 to 1,000 cal/day below TDEE; CDC's steady pace is about 1 to 2 lb a week.
- Keep protein up, within the range above, and check it against any figure your dietitian gives you.
- Continue strength training with progressive overload. Cardio is supplementary.
- Add daily walking. Sustainable activity that doesn't crush recovery.
- Prioritise sleep. Tiredness makes a diet, and training, harder to stick with.
- Take a diet break at maintenance on a long cut if it helps you keep going.
- Track waist circumference weekly in addition to weight.
- End the cut when you reach your target. Move to maintenance for a while before cutting again.
Bulking (muscle gain) playbook
A successful "lean bulk", minimize fat gain while building muscle:
- Keep the surplus small. The calculator's gain goals add +250 or +500 cal/day. Bigger surpluses add more fat, which means longer cuts later.
- Keep protein within the range above.
- Strength training is the driver. Progressive overload, focus on compound lifts (squat, deadlift, bench, overhead press, rows).
- Expect slow gains, and slower ones the longer you've trained. A fast rise on the scale is mostly water, glycogen and fat.
- Track waist measurement. If waist grows faster than chest/shoulders/arms, you're gaining too much fat; lower calories a little.
- Bulk for months, not weeks, then a shorter cut back to your starting body fat. Repeat.
- Check in on body composition now and then with the BMI and body fat calculators.
10 common TDEE / macro mistakes
- Overestimating activity level. The multiplier is the biggest single lever in the result; a desk worker who trains a few times a week should not pick the top levels.
- Underestimating intake. Track carefully for 2 weeks before deciding the calculator is "wrong."
- Eating very little for fast loss. This calculator stops loss targets at 1,200 (women) / 1,500 (men), its own floor; going lower is something to plan with a doctor.
- Skipping protein on a cut. The high-protein and low-carb presets put more of your calories there.
- Switching plans every 2 weeks. Give any approach several weeks before judging. Consistency beats optimization.
- Ignoring NEAT. Everyday movement adds up and needs no recovery time.
- Cheat meals that erase the deficit. One large meal can undo several days of a small deficit. Plan indulgences within the week's total.
- Drinking calories. Coffee drinks, beer and juice add calories without much fullness.
- No diet breaks. Long unbroken deficits are hard to sustain. Maintenance phases help.
- Ignoring sleep. Short nights make planning, cooking and training harder.
8 strategies for sustainable results
- Find a deficit you can sustain. A small deficit you stick to for months beats an aggressive one you abandon in weeks.
- Include protein at breakfast if it helps you stay full until lunch.
- Prep meals in batches. Cooked protein + carb + veggies in containers = consistent macros without daily decisions.
- Eat the same breakfast and lunch. Reduces decision fatigue. Save variety for dinner where it matters.
- Volume eating. High-volume, low-calorie foods (vegetables, broths, popcorn, watermelon) create fullness for few calories.
- Mostly whole foods, some flexibility. Sustainable, and beats strict rules followed by rebellion.
- Track waist + photos + weight, not just one. Weight lies (water, glycogen). Photos and measurements show real change.
- Build the habit BEFORE perfecting macros. Eat around maintenance with adequate protein for a few weeks before optimizing splits.
Nutrition glossary
- BMR (Basal Metabolic Rate)
- Calories burned at complete rest in fasted state. With this calculator's multipliers, 53–83% of TDEE.
- RMR (Resting Metabolic Rate)
- Like BMR but measured under looser conditions. Often used interchangeably.
- TDEE (Total Daily Energy Expenditure)
- Total calories burned in 24 hours: BMR + TEF + EAT + NEAT.
- TEF (Thermic Effect of Food)
- Calories burned digesting food. Highest for protein, lowest for fat.
- NEAT (Non-Exercise Activity Thermogenesis)
- Calories from everyday movement (fidgeting, walking, gardening). Highly variable, key lever for fat loss.
- EAT (Exercise Activity Thermogenesis)
- Calories from formal exercise. Gym machines and watches estimate it, not always well.
- Macros
- Macronutrients: carbohydrates, protein, fat. Each provides energy: 4/4/9 cal per gram (FDA's general factors).
- Mifflin-St Jeor
- The 1990 equation for resting energy expenditure that this calculator uses.
- Katch-McArdle
- Textbook BMR equation based on lean body mass; needs a body-fat percentage.
- Caloric deficit / surplus
- Eating fewer / more calories than TDEE. Drives fat loss / weight gain respectively.
- Metabolic adaptation
- The way energy expenditure adjusts during a sustained deficit, so loss slows. Recalculating at your new weight accounts for part of it.
- Body recomposition
- Building muscle while losing fat simultaneously.
- MPS (Muscle Protein Synthesis)
- The process of building muscle from amino acids, stimulated by eating protein and by training.
- Cut / Bulk
- Cut: caloric deficit phase to lose fat. Bulk: caloric surplus phase to build muscle. Cycled by physique-focused trainees.
Frequently asked questions
What is TDEE?
It is the energy you spend across a whole day: resting metabolism, digesting meals, workouts and ordinary movement combined. Taking in about that many calories keeps weight roughly level; less makes it drift down, more makes it drift up. Two adults of equal weight can have quite different totals, mostly because one moves about more than the other.
How is BMR calculated?
With the Mifflin-St Jeor equation, published by Mifflin, St Jeor and colleagues in the American Journal of Clinical Nutrition in 1990. For a man it is 10 per kilogram, plus 6.25 per centimetre of height, minus 5 per year of age, plus 5. For a woman the final term is −161 instead. The paper predicts resting energy expenditure, which calculators like this one usually call BMR.
Which activity level should I pick?
Match it to an ordinary week rather than your best one. The five levels and their multipliers, from 1.2 up to 1.9, are a widely used convention, not an official standard, and no other input moves the answer as much. If you are torn between two, start with the lower and let a few weeks of weigh-ins show whether to move up.
How fast can I safely lose weight?
CDC's guidance favours a gradual rate of roughly 1 to 2 pounds a week, because those who lose at that rate tend to keep the weight off better than faster losers. The loss options here are sized with the 3,500-calorie rule of thumb, which NIH research shows overstates loss as the months pass. For loss goals the calculator will not go below 1,200 calories for women or 1,500 for men; that floor is its own design choice, not a medical limit.
How much protein do I need?
MedlinePlus puts a healthy adult's protein at 10% to 35% of daily calories. Of the presets here, Balanced (25%), Low carb (35%), Keto (25%), Endurance (20%), Zone (30%) stay inside that band, and High protein (40%) goes above it. The result also shows protein in grams per pound of body weight, which is handy if a dietitian has given you a figure in that form.
What's the difference between the macro splits?
They share out the same calorie target differently among carbohydrate, protein and fat; the total stays put. Balanced gives carbs 50%, Endurance leans further toward carbs, High protein and Low carb move calories to protein and fat, Keto cuts carbs to 5%, and Zone uses the 40/30/30 ratio from the Zone Diet. None is an official eating pattern, so choose one you can keep to.
Why is the Mifflin-St Jeor equation used?
It is a widely used equation built from measurements of healthy adults, and it needs only four things most people know: weight, height, age and sex. The older Harris-Benedict equation is still around; when Roza and Shizgal re-examined it in 1984 they reported a precision of about ±14% for well-nourished people. Katch-McArdle swaps sex and age for a body-fat percentage.
How accurate is TDEE?
Treat it as a first guess. Both halves are estimates: the equation predicts a typical resting burn for someone of your build, and the activity multiplier is a convention. The dependable check is your own scale. Eat at the figure for a few weeks, look at the trend rather than single days, and adjust from there.
Can I eat below my BMR to lose weight faster?
The calculator doesn't compare its target with BMR. Its steepest option takes 1,000 calories a day off TDEE and loss targets stop at 1,200 for women and 1,500 for men, which for some people is still under their BMR. If you are thinking of eating well below the figure shown, talk it through with a doctor or registered dietitian first.
Should I count calories from drinks and condiments?
Yes. Anything with calories counts toward the day, and drinks, sauces and cooking fats are easy to miss because they don't feel like meals. The Nutrition Facts label, or USDA's FoodData Central for foods without one, gives the calories per serving.
How do I track macros without weighing food?
Some coaches use hand-size portions: a palm of protein food, a cupped hand of starchy food, a thumb of fats. It is a rough shortcut. Weighing and logging for a short spell first shows how your usual portions compare with the label, which makes eyeballing more reliable later.
Should I eat more on workout days?
Weight follows the week's total more than any one day, so moving some calories toward training days and away from rest days is fine as long as the weekly sum holds. If you are new to tracking, one daily figure is simpler to follow.
What is the thermic effect of food (TEF)?
It is the energy spent breaking down and absorbing what you eat. Protein costs the most to process and fat the least. This calculator doesn't count it on its own line; the activity multiplier covers it along with movement.
What is NEAT and why does it matter?
Non-exercise activity thermogenesis is what you burn moving about outside planned workouts: walking to the shops, standing, housework, fidgeting. It differs a lot from person to person and is one reason two people of the same size need different amounts of food. The activity level you choose is meant to capture it together with exercise.
Why has my weight loss stalled?
A lighter body needs less, so yesterday's target gives a smaller deficit today: on Mifflin-St Jeor alone, 30 lb lighter means about 136 fewer calories burned at rest each day. NIH modelling (Hall and colleagues, 2011) also builds in the way energy expenditure adapts during loss. Missed entries in a food log and water shifts can hide progress too. Recalculate at your current weight and give any change a few weeks.
Is intermittent fasting better for fat loss?
Fasting windows change when you eat, not how a calorie counts. This calculator can't tell you whether one timing pattern beats another. If a shorter eating window makes the target easier to hit, that is the useful part; if it leads to overeating later, it isn't helping.
How do I build muscle while losing fat (body recomposition)?
Recomposition means adding muscle and losing fat over the same period. The usual approach is eating close to maintenance, keeping protein up, and strength training with gradually heavier loads. It is slow, and tape measurements and photos show it better than the scale does.
Do calories from sugar count differently than calories from vegetables?
For the energy total, no: a calorie counts the same wherever it comes from. Foods differ in what comes with it. Vegetables, fruit, beans and whole grains bring fibre, vitamins and minerals; sugary drinks and sweets bring little besides energy.
How accurate are MyFitnessPal and food labels?
Under FDA rules a label is misbranded if the food holds more than 20% more calories than declared, so a 200-calorie label allows up to 240; the rule sets no matching limit below the label. App entries typed in by other users can be wrong, so prefer verified entries or the package itself.
Should I do reverse dieting after a long cut?
Reverse dieting means raising calories in small steps after a diet instead of all at once. There is no official guidance on it. The simple alternative is to move straight to the maintenance figure this calculator gives at your new weight, then watch the trend for a few weeks.
What's the difference between BMR, RMR, and TDEE?
Basal metabolic rate is measured under strict conditions: fasted, fully rested, lying still. Resting metabolic rate is measured with looser rules, so the two can differ slightly. TDEE adds digestion, exercise and daily movement on top. The Mifflin-St Jeor paper predicts resting energy expenditure, although this calculator, like most, labels the result BMR.
Can I gain muscle on a vegan or vegetarian diet?
Yes. Tofu, tempeh, seitan, lentils, beans, soy milk and soy yogurt all supply protein, and mixing sources through the day covers the full range of amino acids. Food labels or USDA's FoodData Central give the grams for each food, so you can check a day's total against your target.
Should I drink protein shakes or eat whole-food protein?
Whole food first, a shake when it helps. Meat, fish, eggs, dairy and beans bring vitamins, minerals and, for beans, fibre along with protein. Powders are simply protein in a convenient form, useful when a day falls short; what matters is the day's total.
How long should I bulk vs cut?
There is no official timetable. Many lifters alternate longer phases on a small surplus with shorter phases on a deficit, and watch their waist measurement to catch fat gain early. The goal setting in this calculator gives the calorie side of each phase.