Calorie Calculator — Daily Calorie Needs (2026)
Calculate how many calories you need per day based on your age, gender, weight, height, and activity level. Uses the Mifflin-St Jeor equation.
Your Daily Calorie Needs
2,693 cal
Maintenance calories per day
1,737 cal
BMR
2,443 cal
Mild Weight Loss
2,193 cal
Weight Loss
3,193 cal
Weight Gain
To maintain your current weight, you need approximately 2,693 calories per day. For gradual weight loss (0.5 lb/week), aim for 2,443 calories. Your Basal Metabolic Rate (BMR) is 1,737 calories.
Analysis & insights
Your estimated maintenance is 2,693 calories/day (BMR 1,737 + activity multiplier 1.55). For 1 lb/week weight loss, target ~2,193 cal/day. For 1 lb/week gain, target ~3,193 cal/day. These are starting points — track your real intake for 2-4 weeks and adjust based on actual trend.
High calorie need
Above-average maintenance — common in larger frames or higher-activity lifestyles.
Risk & benchmark gauge
Current band
High needs
2,693 cal/day maintenance
Industry benchmarks
- Your maintenance2,693 cal/day
- BMR (at rest)1,737 cal/day
- US adult average~2,200 cal/day
- For 1 lb/week loss2,193 cal/day
- For 1 lb/week gain3,193 cal/day
Key insights
BMR vs maintenance
Your body burns 1,737 calories at complete rest. Activity adds another 956 on top — that's the energy cost of moving through your day.
The 3,500 rule is approximate
"3,500 calories = 1 lb" is a rough heuristic. Real-world weight change is non-linear due to metabolic adaptation, water shifts, and digestive variation. Plan in 2-4 week trends, not daily.
Recommended actions(3)
Track for 1 week before adjusting
High priorityUse a food log app (MyFitnessPal, Cronometer) to capture your ACTUAL intake. Your real number is almost always different from what you expect.
Impact: Real data lets you adjust by 100-200 cal at a time and see what actually moves the scale.
Eat enough protein
High priorityAt minimum 0.7 g/lb bodyweight (1.5 g/kg). Protein preserves muscle during weight loss and is the most satiating macronutrient.
Impact: Higher-protein diets show 20-40% better fat loss vs equal-calorie lower-protein diets in randomized trials.
Cut/add in 250 cal increments
Medium priorityAggressive cuts (>750 cal deficit) backfire — increased hunger, lost muscle, plummeting metabolism. Steady wins.
This tool is for informational purposes only and does not constitute medical advice. Consult a healthcare professional for advice specific to your situation.
What is Daily Calorie Needs?
Your daily calorie requirement is the energy your body spends in 24 hours. Roughly 60–70% of it goes on basal metabolism — the involuntary work of staying alive — with the rest split between digestion and physical movement. Eat consistently above that total and you gain weight; consistently below it and you lose weight.
That much is settled physiology. What is far less certain is the number itself. Every calorie calculator, including this one, estimates your basal rate from a regression equation fitted to population averages, and individual metabolic rates vary meaningfully around those averages even between people of identical height, weight, age and sex.
So the honest way to use any calorie figure is as a starting hypothesis rather than a prescription. Eat at the estimate for two to three weeks, track your weight trend, and adjust based on what actually happens. Your own data beats any equation.
The formula — how to calculate Daily Calorie Needs
- BMR
- = basal metabolic rate — energy burned at complete rest
- Activity factor
- = 1.2 sedentary, 1.375 light, 1.55 moderate, 1.725 very active, 1.9 extremely active
- TDEE
- = total daily energy expenditure — the maintenance figure
Mifflin-St Jeor is used because it has been shown to predict resting energy expenditure more accurately than the older Harris-Benedict equation in most populations. Neither accounts for body composition, which is why it under-estimates for very muscular people and over-estimates at high body-fat percentages.
Step-by-step example
- 01A 35-year-old woman, 165 cm, 70 kg, exercising moderately three to four times a week.
- 02BMR = (10 × 70) + (6.25 × 165) − (5 × 35) − 161
- 03BMR = 700 + 1,031 − 175 − 161 = 1,395 calories per day at complete rest.
- 04Apply the moderate activity factor: TDEE = 1,395 × 1.55 ≈ 2,162 calories.
- 05That is her maintenance intake — the level at which weight should stay stable.
- 06For roughly 0.5 kg (1 lb) of loss per week, subtract about 500 per day: ≈ 1,662 calories.
- 07For gradual muscle gain, add 250–350: ≈ 2,400–2,500 calories.
- 08Note the compounding uncertainty: if the BMR estimate is off by 10% and the activity factor is one level wrong, the maintenance figure could realistically sit anywhere between about 1,900 and 2,400.
What actually makes up your daily burn
Total expenditure has four components, and only one of them is exercise — which is why "burning it off at the gym" is a weaker lever than most people assume.
Components of total daily energy expenditure
| Component | Share of total | What it is |
|---|---|---|
| Basal metabolic rate | 60–70% | Organ function, circulation, cell maintenance at rest |
| Thermic effect of food | ~10% | Energy used digesting and absorbing what you eat |
| Non-exercise activity | 15–30% | Walking, fidgeting, posture, all unplanned movement |
| Exercise activity | 0–15% | Deliberate training |
Non-exercise activity thermogenesis varies enormously between individuals and tends to fall when calories are restricted — one reason weight loss slows over time even when intake stays constant.
Activity trackers overestimate, often substantially
Wearable devices and gym machines are known to overstate calories burned during exercise, sometimes by a wide margin. If you eat back everything a tracker credits you, you can easily erase the deficit you intended to create. Treat tracker burn figures as directional, not as budget.
Choosing an activity factor honestly
The activity multiplier is where most estimates go wrong, because people select aspirationally rather than descriptively. The difference between "light" and "very active" on the same BMR is several hundred calories a day — enough to turn an intended deficit into a surplus.
A useful discipline is to describe an average week including the days you do nothing, not your best week. Someone who trains hard three times weekly and sits at a desk otherwise is usually "moderate", not "very active".
- Sedentary (1.2) —
- desk job, little deliberate exercise, minimal daily walking.
- Lightly active (1.375) —
- light exercise one to three days a week, or a job with some movement.
- Moderately active (1.55) —
- moderate exercise three to five days a week. Most regular gym-goers with desk jobs belong here.
- Very active (1.725) —
- hard exercise six to seven days a week, or a physically demanding job.
- Extremely active (1.9) —
- twice-daily training, or heavy manual labour plus training. Genuinely uncommon.
Why deficits stop working, and what to do about it
Weight loss reliably slows even when intake stays constant, and the reason is not failure of willpower. A smaller body costs less to run: basal rate falls as mass drops, moving costs less energy, and non-exercise movement tends to decline unconsciously during restriction.
The practical consequence is that a deficit calculated at your starting weight becomes a smaller deficit as you lose. Recalculating every four to six kilograms, or every couple of months, keeps the target honest.
Aggressive restriction accelerates this. Very large deficits increase the share of weight lost as lean tissue rather than fat, which lowers your metabolic rate further and makes maintenance harder afterwards. A moderate deficit of roughly 15–25% below maintenance, combined with adequate protein and resistance training, preserves considerably more lean mass.
Floors worth respecting
Sustained intakes below roughly 1,200 calories for women or 1,500 for men make it difficult to meet micronutrient needs and are generally not advisable without medical supervision. If your calculated deficit target falls below those levels, increase activity rather than cutting further.
Where the estimate is least reliable
Mifflin-St Jeor uses total body weight and has no way to distinguish muscle from fat, so it systematically misestimates at the extremes of body composition. A muscular athlete typically burns more than predicted; someone with a high body-fat percentage typically burns less.
The Katch-McArdle equation addresses this by calculating from lean body mass instead, which makes it the better choice when you have a reliable body-fat measurement. Without one, it simply moves the guesswork rather than removing it.
Several factors the equation cannot see also matter: thyroid function, certain medications, sleep quality, and — for women — menstrual cycle phase, which can shift both expenditure and water retention enough to obscure a genuine trend on the scale.
Key considerations
- Treat the number as a two-to-three week experiment, then adjust from your actual weight trend.
- Weigh yourself under consistent conditions and judge the weekly average rather than day-to-day readings.
- Recalculate after every few kilograms of change — the target moves as you do.
- Prioritise protein during a deficit to preserve lean mass, alongside resistance training.
- Do not eat back the full calorie burn a tracker reports; the figures are commonly inflated.
- A moderate deficit is more sustainable and preserves more lean tissue than an aggressive one.
- If you have a thyroid condition, diabetes, an eating disorder history, or are pregnant or breastfeeding, work with a clinician rather than a calculator.
Common mistakes to avoid
- Selecting an activity level aspirationally, which can wipe out the intended deficit entirely.
- Treating the estimate as an exact requirement rather than a starting point.
- Eating back tracker-reported exercise calories in full.
- Cutting far below maintenance in the belief that faster is better — it costs lean mass and slows metabolism.
- Never recalculating after significant weight change.
- Judging progress from daily weigh-ins, which are dominated by water and food-in-transit.
- Ignoring protein intake during restriction, which increases the share of weight lost as muscle.
Frequently asked questions
Sources & references
Written and fact-checked by the CalcProLabs Editorial Team against Mifflin-St Jeor equation and Dietary Guidelines for Americans. Read our calculation methodology and editorial policy.
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