Our maintenance calorie calculator removes the guesswork entirely. Enter your age, sex, height, weight, and activity level, and you will instantly know three things: how many calories your body burns at rest (BMR), how many calories you burn across an entire day (TDEE), and exactly how many daily calorie needs to hit based on whether you want to lose fat, build muscle, or stay exactly where you are.
Most accurate for modern lifestyles. Used by many nutritionists.
Classic formula, revised in 1984. Still widely used.
Total Daily Energy Expenditure based on your activity level.
Calorie tracking apps are powerful tools for the first 4–8 weeks of a new diet. Even imprecise tracking increases awareness dramatically and usually produces meaningful behaviour change. You do not need to track every meal forever — but tracking consistently for the first two months builds the nutritional intuition that makes long-term success possible without apps.
Protein is the most satiating macronutrient — it keeps you full longer per calorie than either carbohydrates or fat. Structuring meals around a protein source (chicken, fish, eggs, legumes, Greek yoghurt, cottage cheese) and then filling in carbohydrates and fats makes staying within your calorie intake calculator target significantly easier, particularly during a deficit.
Consuming 500 ml of water 30 minutes before eating reduces calorie intake by approximately 13% in research trials. Thirst is frequently mistaken for hunger, causing unnecessary
calorie per day
overage.
Calorie density is the number of calories per gram or per volume of food. Vegetables, fruits, and lean proteins have low calorie density — you can eat large volumes for relatively few calories. Processed foods, cooking oils, and refined carbohydrates have high calorie density — small amounts add up quickly. Shifting your diet toward lower calorie density foods naturally reduces total intake without requiring constant portion control willpower.
Exercise does two things for daily calorie needs management: it increases your TDEE directly through calorie burn, and it improves body composition (more muscle, less fat) over time, which raises your resting BMR. Even 150 minutes of moderate exercise per week — the minimum recommended by the World Health Organisation — produces meaningful TDEE elevation. Build exercise habits you can sustain for years, not weeks.
Sleep deprivation increases levels of ghrelin (the hunger hormone) and decreases levels of leptin (the satiety hormone), producing a calorie intake increase of an estimated 300–500 kcal on sleep-restricted days according to research published in the Annals of Internal Medicine. Protecting your sleep is a genuine nutrition strategy — not just a wellness platitude.
A maintenance calorie calculator is a science-based tool that combines your personal biometrics — age, sex, height, weight — with your real-world activity level to produce one reliable number: the exact calories your body needs every day to hold its current weight. That number is your Total Daily Energy Expenditure (TDEE), and it is the single most important figure in any nutrition plan.
Without knowing your maintenance calories, every diet decision is a guess. You might eat 1,800 calories and wonder why you are not losing weight — not realising your TDEE is 1,750 and you are actually in a slight surplus. You might cut aggressively to 1,200 calories per day and trigger muscle loss, fatigue, and metabolic adaptation that sabotages long-term results. Precision matters, and a validated maintenance calorie calculator gives you that precision in under 60 seconds.
This tool uses the Mifflin-St Jeor equation, validated in a 2005 systematic review published in the Journal of the American Dietetic Association (Frankenfield, Roth-Yousey & Compher) as the most accurate BMR prediction formula for the general adult population. It outperforms older formulas — including the original Harris-Benedict equation — by an average of 5% in accuracy across a broad range of body types and lifestyles.
Your Basal Metabolic Rate is the calories your body burns at complete rest — breathing, circulating blood, maintaining core temperature, and running organ function. It represents roughly 60–70% of your total daily calorie burn. Use the BMR calculator result above as your foundation, never as a diet target.
Total Daily Energy Expenditure is BMR multiplied by your activity level. The TDEE calculator result above is the number you actually act on — it accounts for exercise, daily movement, and even the energy cost of digesting food (thermic effect of food, roughly 10% of total expenditure).
Maintenance calories and TDEE are effectively the same number. Eat at this level and your weight holds perfectly stable. Eat below it to create a calorie deficit for weight loss. Eat above it to fuel muscle growth. This single number anchors every goal.
Understanding how to calculate maintenance calories demystifies the process and helps you trust your results. The calculation happens in two sequential steps — both performed automatically by the maintenance calorie calculator above.
This BMR calculator formula predicts resting metabolic rate within ±10% for most healthy adults. A 32-year-old woman, 165 cm, 68 kg has a BMR of approximately 1,444 kcal — the calories she burns lying completely still all day.
The same woman, exercising moderately (×1.55), has a TDEE of 1,444 × 1.55 = 2,238 calories per day. That is her maintenance calorie target — the precise answer to how many calories should I eat to stay at her current weight.
Once your TDEE is established, your goal calories follow directly. This maintenance calorie calculator applies the adjustment automatically based on your selected goal — giving you a ready-to-use daily calorie target in one step.
Once this maintenance calorie calculator gives you your TDEE, answering how many calories should I eat becomes straightforward arithmetic. Your goal determines whether you eat at, above, or below your maintenance number. Here is exactly how each goal works in practice.
A calorie deficit for weight loss of 250–500 kcal per day below your TDEE produces 0.25–0.5 kg of genuine fat loss per week. This range is recommended by sports dietitians because it is aggressive enough to produce visible results while being conservative enough to preserve lean muscle mass and hormonal health. Deficits exceeding 750 kcal per day accelerate muscle breakdown and trigger metabolic adaptation, reducing TDEE over time and making fat loss progressively harder.
Eating at your exact maintenance calories keeps body weight stable. This is the ideal phase for body recomposition — simultaneously losing fat and building muscle when combined with progressive resistance training and adequate protein intake (1.6–2.2 g/kg body weight). It is also the right target during diet breaks, athletic performance phases, or when you have reached your goal weight and want to solidify that result.
A lean bulk surplus of 200–350 calories above your maintenance calories provides sufficient energy for muscle protein synthesis without accumulating excessive body fat. Research consistently shows that surpluses above 500 kcal per day produce diminishing returns in muscle gain while increasing fat storage. For trained individuals, a 200 kcal surplus with 2.0–2.4 g/kg protein is the evidence-based standard.
Research from Cornell University found that people routinely underestimate their calorie intake by 20–40% when self-reporting. Liquid calories (coffee drinks, juices, smoothies), cooking oils, condiments, and portion size errors are the primary causes. Even when your TDEE calculator result is perfectly accurate, inaccurate food logging creates a false picture. Use a digital food scale for the first 4–6 weeks of any new diet phase to calibrate your portion intuition.
Your maintenance calories are not a permanent number. Every kilogram of body weight change shifts your TDEE by approximately 20–30 kcal per day. Every kilogram of muscle you add raises your resting BMR by roughly 13 kcal. Return to this maintenance calorie calculator every 4–5 kg of weight change, every new training programme, or every 8–10 weeks — whichever comes first. Using a stale TDEE figure is one of the most avoidable causes of fat loss plateaus.
This maintenance calorie calculator provides a clinically validated starting estimate for healthy adults. However, individuals with thyroid disorders, PCOS, type 2 diabetes, a history of disordered eating, pregnancy, or competitive athletic demands should combine these results with personalised guidance from a registered dietitian (RD) or sports nutritionist. Formulas have population-level accuracy; dietitians provide individual-level precision.
The concept of a calorie deficit for weight loss rests on the First Law of Thermodynamics: energy cannot be created or destroyed, only converted. When your body receives fewer calories than it expends, it must source the remaining energy from stored tissue — primarily fat, but also muscle if protein intake is insufficient and the deficit is too aggressive. This is not a diet philosophy; it is applied biochemistry.
The widely quoted “3,500 calories per pound” rule is a useful approximation but a significant oversimplification. Real-world fat loss follows a non-linear trajectory because of metabolic adaptation, lean mass changes, and water weight fluctuations. A systematic review in Obesity Reviews (Ashtary-Larky et al., 2020) found that slower rates of loss — approximately 0.5% of body weight per week — preserved significantly more lean muscle mass than faster rates, making the body composition outcome substantially better even when the scale moved more slowly.
Fat loss rate: 0.25–0.5 kg per week
Best for: Most adults, anyone within 10–15 kg of goal weight, athletes maintaining performance
Evidence: Preserves muscle mass when combined with 1.6–2.2 g/kg protein and resistance training
Fat loss rate: 0.5–0.75 kg per week
Best for: Individuals with significant weight to lose (>20 kg from goal)
Caution: Requires careful protein intake (2.0–2.4 g/kg) to limit muscle loss. Monitor energy levels and hunger closely.
Fat loss rate: ~1 kg per week (initially)
Caution: Recommended only under medical or dietitian supervision. Risks include significant muscle loss, hormonal disruption, micronutrient deficiency, and metabolic adaptation that reduces TDEE over time.
Three mechanisms explain the plateau that almost every person experiences. First, metabolic adaptation — as body weight drops, TDEE decreases because a smaller body requires less energy to maintain. A 10 kg weight loss reduces TDEE by approximately 200–300 kcal per day, eroding the deficit you started with. Second, adaptive thermogenesis — the body unconsciously reduces non-exercise activity (fidgeting, posture adjustments, spontaneous movement) by 100–300 kcal per day during calorie restriction. Third, dietary drift — portion sizes and food choices gradually shift back toward baseline as the novelty of a diet fades. The solution to all three is the same: return to this maintenance calorie calculator, update your TDEE at your new body weight, and re-establish your target accordingly.
Your maintenance calories are not a fixed permanent number. They are a dynamic output of several physiological variables. Understanding these factors helps you interpret your TDEE calculator results with appropriate nuance and adjust your calorie target intelligently when real-world results diverge from predictions.
Understanding how to calculate maintenance calories in the abstract is useful. Seeing it applied to realistic profiles makes it immediately actionable. All values below use the exact Mifflin-St Jeor formula this maintenance calorie calculator employs — enter your own numbers above to get your personalised result.
Profile: 60 kg, 163 cm, sedentary (×1.2)
BMR: 1,352 kcal | TDEE: 1,622 kcal
Fat loss target: 1,122–1,372 kcal/day
This is a common profile where aggressive calorie cutting below 1,200 kcal is frequently attempted and counterproductive. A 500 kcal deficit at 1,122 kcal/day is already near the physiological minimum for this body size.
Profile: 85 kg, 178 cm, moderate (×1.55)
BMR: 1,875 kcal | TDEE: 2,906 kcal
Fat loss target: 2,406–2,656 kcal/day
With nearly 2,900 kcal of maintenance headroom, this profile has ample room for a comfortable deficit without triggering hunger or energy crashes. A 500 kcal deficit represents only 17% of total expenditure.
Profile: 72 kg, 167 cm, light (×1.375)
BMR: 1,481 kcal | TDEE: 2,036 kcal
Fat loss target: 1,536–1,786 kcal/day
Perimenopause may reduce actual TDEE by 100–200 kcal below this formula estimate. If results are slower than expected, a 150 kcal downward adjustment — not a dramatic cut — is the appropriate first response.
Profile: 75 kg, 182 cm, very active (×1.725)
BMR: 1,904 kcal | TDEE: 3,284 kcal
Lean bulk target: 3,484–3,634 kcal/day
Athletic populations often undereat relative to their actual TDEE, interpreting fatigue and performance decline as normal training stress when the real cause is insufficient calorie intake for their expenditure level.
Profile: 65 kg, 160 cm, moderate (×1.55)
BMR: 1,289 kcal | TDEE: 1,998 kcal
Fat loss target: 1,498–1,748 kcal/day
Post-menopausal women often find formula predictions overestimate their actual TDEE by 150–250 kcal. Resistance training is especially high-value here — every kg of muscle added meaningfully raises the BMR baseline that the maintenance calorie calculator builds from.
Profile: 100 kg, 175 cm, sedentary (×1.2)
BMR: 2,005 kcal | TDEE: 2,406 kcal
Fat loss target: 1,906–2,156 kcal/day
A higher body weight means a higher absolute TDEE, which is an advantage — it creates more calorie deficit headroom. Even a sedentary 100 kg man maintains at 2,400 kcal, making a 500 kcal deficit entirely comfortable at 1,906 kcal/day.
Getting your TDEE from the maintenance calorie calculator above is step one. Using it correctly over the following weeks determines whether you see real results. Here is a structured five-step protocol used by registered dietitians with clients starting a new calorie target.
Take the Goal Calories figure from your results above and enter it as your daily limit in a food tracking application — MyFitnessPal, Cronometer, and Lose It are all well-validated options with comprehensive food databases. The specific app matters less than consistent daily use. Logging creates the accountability loop that bridges the gap between knowing your calorie needs and actually hitting them.
Daily body weight fluctuates 0.5–2 kg due to water retention, food volume, sodium intake, and hormonal cycles. A single daily reading is statistically meaningless for tracking fat loss trends. Instead, weigh yourself every morning after using the bathroom, before eating, and calculate a 7-day rolling average each Monday. A downward trend in the weekly average — even 0.1–0.2 kg — confirms your calorie deficit for weight loss is working as intended.
Allow a minimum of 14 days before concluding the TDEE calculator result is inaccurate. Water weight changes, hormonal fluctuations, and glycogen shifts can mask genuine fat loss or gain for 10–12 days. Patience is not passive acceptance — it is analytical discipline. Many people abandon a correctly calibrated calorie target because short-term scale noise mimics stagnation when real progress is occurring beneath the surface.
If your weekly average weight has not moved in the expected direction after a full 3 weeks of accurate tracking, your actual TDEE differs from the formula prediction — which is normal, given individual variation in gut microbiome efficiency, adaptive thermogenesis, and NEAT. Adjust your daily calorie target by 100–150 kcal in the appropriate direction. Re-assess after 2 more weeks. Small, systematic adjustments consistently outperform dramatic calorie resets that create unnecessary hunger and dietary fatigue.
Return to this maintenance calorie calculator every time your weight changes by 4–5 kg, when you switch training programmes, or after any significant lifestyle change (new job, injury, seasonal activity change). TDEE is not a fixed equation output — it is a dynamic number that shifts with body composition, weight, and activity. The most common and most avoidable reason fat loss plateaus is continuing to eat at a calorie target calculated for a body that no longer exists.
Your Goal Calories figure from the maintenance calorie calculator above tells you how much to eat. How you allocate those calories across protein, carbohydrates, and fats determines your body composition outcome — especially during a calorie deficit for weight loss. Protein is the variable that makes the most difference.
Why higher protein in a deficit: Dietary protein is the primary substrate for muscle protein synthesis. During a calorie deficit, the body increases muscle protein breakdown for energy. High protein intake (2.0–2.4 g/kg) blunts this breakdown, preserving lean tissue that would otherwise lower your BMR as you lose weight.
Satiety advantage: Protein produces greater satiety per calorie than either carbohydrates or dietary fat, making it significantly easier to stay within your calorie target throughout the day without constant hunger.
Performance function: Carbohydrates are the primary fuel for high-intensity exercise. Severely restricting carbohydrates below 100–150 g per day while training intensely produces measurable performance decrement — strength drops, endurance suffers, and recovery slows. This indirectly reduces your training TDEE, undermining the calorie deficit.
Practical priority: Centre carbohydrate intake around training sessions. Reduce carbohydrates on rest days if needed rather than across the board — this approach is called carbohydrate periodisation and is supported by considerable sports nutrition evidence.
Hormonal critical function: Dietary fat is the raw material for steroid hormone synthesis — including testosterone, oestrogen, and cortisol. Dropping fat intake below 20% of total calories (roughly 0.5 g/kg) suppresses testosterone production in men and disrupts menstrual cycles in women within 6–8 weeks. This hormonal disruption then impairs muscle retention during a deficit.
Practical floor: Never drop dietary fat below 40–50 g per day regardless of how aggressive your calorie deficit is. Fill remaining calorie space with protein and carbohydrates after meeting this minimum.
Our tool uses the Mifflin-St Jeor equation, which predicts resting metabolic rate within approximately ±10% for most healthy adults according to independent validation studies. Individual variation exists due to genetics, hormonal factors, gut microbiome differences, and body composition — specifically the ratio of muscle to fat tissue. Use the output as a clinically sound starting point, track your real-world results over 2–3 weeks, and adjust your daily calorie needs target by 100–150 calories if your actual weight change does not match the prediction.
To lose approximately 1 kg per week, you need a daily calorie deficit of around 1,000 calories below your TDEE. This is an aggressive deficit that most nutrition professionals recommend only for individuals with a significant amount of weight to lose and only under medical supervision. For most people, a 500–750 calorie calorie deficit for weight loss is more sustainable and better preserves lean muscle mass.
TDEE varies significantly by body size and activity level. A sedentary adult woman might have a TDEE of 1,600–1,900 calories. A sedentary adult man might be 2,000–2,400 calories. A very active woman could have a TDEE of 2,400–2,800 calories. A very active man might reach 3,000–3,500 calories or more. Use the TDEE calculator above to find your specific number rather than relying on population averages.
Your maintenance calorie level — also called TDEE (Total Daily Energy Expenditure) — is the total number of calories per day your body burns across all functions and activities. It equals your BMR multiplied by your activity level factor (1.2 for sedentary, up to 1.9 for extremely active). Eating at exactly your maintenance calorie keeps your weight perfectly stable.
Your daily calorie burn depends on your weight, height, age, sex, and activity level. A sedentary adult typically burns between 1,600 and 2,200 calories per day. A very active person may burn 2,800–3,500 kcal or more. Use our calorie burn calculator with the activity setting that honestly reflects your lifestyle for the most accurate TDEE estimate.
If you selected your activity level accurately in the calorie intake calculator, your typical exercise sessions are already included in your TDEE. You should only consider eating additional calories for exercise that significantly exceeds your usual volume — for example, completing a 25 km training run when your normal workout is a 5 km jog. Eating back all exercise calories is generally unnecessary and often counterproductive for fat loss goals.
Several reasons account for this common experience. Water retention from high-sodium meals, hormonal fluctuations (particularly in women), increased muscle glycogen from new resistance training, digestive contents, and scale timing all create day-to-day weight variation that can mask genuine fat loss. Judge progress by weekly averages, not daily readings. If your weight has genuinely not moved for three full weeks, either your calorie intake is higher than tracked or your actual TDEE is lower than the calculator predicted — both are solvable.
The maintenance calorie calculator provides a useful baseline, but thyroid disorders — particularly hypothyroidism — meaningfully reduce metabolic rate beyond what the formula accounts for. If you have a thyroid condition, treat the calculator output as an overestimate and work with your endocrinologist or a registered dietitian to establish a more accurate daily calorie needs target.
Calorie counting is effective but not strictly mandatory. Many people achieve results through portion control, food quality improvements, or intuitive eating. However, tracking your calorie per day intake provides the most precise control over your deficit — especially when progress has stalled or you want to hit a specific timeline goal.
BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest — essentially the energy cost of staying alive with no movement. TDEE (Total Daily Energy Expenditure) is BMR multiplied by your activity level, representing your full daily calorie burn including movement, exercise, and the energy cost of digesting food (thermic effect of food). Our BMR calculator outputs your resting number; the TDEE calculator gives you your real-world maintenance number. Always use TDEE as your target reference, not BMR.
Recalculate every 4–5 kg of weight change, every new exercise programme, or every 8–10 weeks — whichever comes first. Your TDEE is not a fixed number. It changes with your body weight, muscle mass, age, and activity patterns. Using an outdated maintenance calorie calculator result is one of the most common — and most avoidable — reasons fat loss plateaus.