Calorie Calculator - Daily Calorie Needs for Weight Loss, Gain and Maintenance
Use this free daily calorie counter to find out how much you should eat each day. Enter your age, weight, height, and activity level to get your BMR, TDEE, and a personalized calorie target for weight loss, muscle gain, or maintenance — with a full macros breakdown and every calculation step shown.
What is a calorie calculator?
A calorie calculator is an online tool that estimates how many calories your body burns each day by calculating your Basal Metabolic Rate (BMR) and multiplying it by an activity factor to get your Total Daily Energy Expenditure (TDEE). This calorie calculator tool then applies your weight-loss, maintenance, or muscle-gain goal to give you a daily calorie target, along with recommended protein, carbohydrate, and fat grams. Use it as your daily calorie counter to set an accurate eating target based on your personal body stats.
Daily Calorie Intake Calculator
Gym sessions or sport 3–5 days per week at moderate intensity
How to Calculate Daily Calorie Needs?
Your estimated daily calorie needs = BMR × Activity Factor. BMR is the calories your body burns at complete rest. The activity factor accounts for movement. From that TDEE (Total Daily Energy Expenditure), you add or subtract calories depending on whether your goal is to gain weight, lose weight, or maintain.
Most calorie calculators hand you a number and nothing else. That's useful, but it skips the part that actually helps people make good decisions understanding where the number comes from and how to adjust it when the scale doesn't move. Whether you are estimating calories for the first time or refining a target that stopped working, this page shows every step so you can understand and trust the result rather than just copying it.
Step-by-step: How this calculator works?
Calculate your BMR
BMR (Basal Metabolic Rate) is the number of calories your body needs to simply stay alive at complete rest, covering circulation, breathing, body temperature, and organ function. It accounts for roughly 60–75% of your total daily calorie burn. This calculator computes BMR using three formulas: Mifflin-St Jeor for general use, Harris-Benedict as an alternative, and Katch-McArdle when you enter body fat percentage.
Multiply by your activity factor to get TDEE
TDEE (Total Daily Energy Expenditure) is your true daily burn, including movement. It equals BMR × activity factor. Sedentary people use 1.2×, moderately active people use 1.55×, and very active people use up to 1.9×. Most people slightly overestimate their activity level, which is the most common reason a calorie target based on a calculator doesn't produce the expected results.
Apply your goal adjustment
Weight loss requires eating below TDEE (a deficit). Maintenance means eating at TDEE. Muscle gain requires eating above TDEE (a surplus). A 500-calorie daily deficit creates roughly 0.5 kg (1 lb) of fat loss per week, since 3,500 calories of deficit equals approximately 1 lb of stored fat.
Read your macronutrient targets
The macro split adjusts based on your goal. Weight loss prioritizes protein (35%) to preserve muscle during a deficit. Muscle gain prioritizes carbohydrates (50%) to fuel training sessions. Maintenance uses a balanced 30/40/30 protein/carb/fat split. These ratios are evidence-based starting points, not rigid rules.
Mifflin-St Jeor vs Harris-Benedict vs Katch-McArdle: Which Formula Is Right for You?
For most people, use Mifflin-St Jeor. It outperforms Harris-Benedict in published accuracy studies for the general population. If you know your body fat percentage, use Katch-McArdle — it's the most precise of the three because it ignores fat mass entirely, which doesn't contribute meaningfully to resting metabolic rate.
Mifflin-St Jeor Equation (1990)
Male: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
Female: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161
Best for: general adult population, people of average body composition. Studies show ±10% accuracy for approximately 80% of people.
Harris-Benedict Equation (revised 1984)
Male: BMR = 88.36 + 13.40 × weight + 4.80 × height − 5.68 × age
Female: BMR = 447.59 + 9.25 × weight + 3.10 × height − 4.33 × age
Best for: cross-referencing Mifflin results. Tends to run slightly higher. The original 1919 version is less accurate than the 1984 revision used here.
Katch-McArdle Formula
BMR = 370 + (21.6 × lean body mass in kg)
Best for: athletes, bodybuilders, and anyone with an above-average or below-average body fat percentage. Requires a body fat percentage measurement, which you can get from a DEXA scan, skinfold calipers, or a body fat scale.
| Formula | Best For | Requires Body Fat %? | General Accuracy |
|---|---|---|---|
| Mifflin-St Jeor | General adult population | No | ~±10% for 80% of people |
| Harris-Benedict (revised) | Cross-check reference | No | Slightly less accurate than Mifflin |
| Katch-McArdle | Athletes, high or low body fat | Yes | Most accurate when body fat known |
When people search for calorie for body weight, they are usually asking how calories relate to their specific weight and composition. All three formulas above use body weight as a core input, but Katch-McArdle goes further by separating fat mass from lean mass, giving the most accurate calorie estimate relative to actual metabolically active tissue. This matters most when body weight alone is a misleading indicator of energy needs.
How to Choose Your Activity Level (and Why People Get This Wrong)
The practical guide most pages skip
Choosing the right activity multiplier is the most impactful decision in this entire calculator, and it's where most people inflate their number. A common mistake is selecting "moderately active" because you exercise three times a week, without accounting for the other 165 hours of the week spent mostly sitting. The right choice is the one that reflects your entire average day, not just your workouts.
Sedentary (1.2×)
Choose this if you sit most of the day for work and have no consistent exercise routine. Even people who take daily 20-minute walks may still fit here if the rest of the day is largely inactive.
Lightly active (1.375×)
Choose this if you exercise 1–3 days per week at low to moderate intensity, such as walking, gentle cycling, or recreational sport, and your work is otherwise desk-based.
Moderately active (1.55×)
Choose this if you exercise 3–5 days per week at genuine moderate-to-high effort, with sessions that raise your heart rate and cause real fatigue. This is the right pick for most people who actually train consistently.
Very active (1.725×)
Choose this if you exercise intensely most days of the week or have a physically active job such as construction, manual labor, or professional coaching, combined with a training program.
Extra active (1.9×)
Choose this only for athletes training twice daily, military recruits, or people with both an intense training program and heavy physical labor as a job. Very few people genuinely qualify for this level.
The "one level lower" rule of thumb
A widely used practitioner approach is to start one activity level lower than your instinct suggests, use that calorie target for three weeks, and track whether your weight moves in the expected direction. If it doesn't, step up to the next level. This accounts for the known tendency to overestimate activity and underestimate food intake simultaneously.
Real-World Calorie Targets: Examples by Goal, Body Size, and Activity
These worked examples show what realistic calorie targets look like for different people, based on the same Mifflin-St Jeor formula this calculator uses.
Example 1: Woman, weight loss, 30 years old, 165 cm, 70 kg, moderate activity
Calculation: BMR = (10 × 70) + (6.25 × 165) − (5 × 30) − 161 = 1,439 kcal. TDEE = 1,439 × 1.55 = 2,230 kcal. Weight loss target (−500): 1,730 kcal/day.
Why it matters: At 1,730 kcal/day, this woman has enough room to eat satisfying, nutrient-dense meals while creating a meaningful deficit. Dropping below 1,400 would risk nutrient shortfalls without meaningfully faster fat loss.
Example 2: Man, muscle gain, 25 years old, 180 cm, 80 kg, very active
Calculation: BMR = (10 × 80) + (6.25 × 180) − (5 × 25) + 5 = 1,930 kcal. TDEE = 1,930 × 1.725 = 3,329 kcal. Muscle gain target (+250): 3,579 kcal/day.
Why it matters: A 250-calorie surplus gives this man enough extra energy to support muscle protein synthesis without accumulating excessive fat. Going straight to a 500+ surplus often adds more fat than muscle beyond this point.
Example 3: Woman, maintenance, 45 years old, 160 cm, 65 kg, lightly active, 28% body fat
Calculation: Lean mass = 65 × (1 − 0.28) = 46.8 kg. Katch-McArdle BMR = 370 + (21.6 × 46.8) = 1,381 kcal. TDEE = 1,381 × 1.375 = 1,899 kcal.
Why it matters: Using Katch-McArdle instead of Mifflin-St Jeor here gives a slightly lower BMR because it accounts for the body fat mass, which burns fewer calories than lean tissue. For a 45-year-old woman at this activity level, 1,899 kcal is a realistic maintenance target.
Calorie Cycling: Eating More on Training Days and Less on Rest Days
Quick Answer
Calorie cycling means eating slightly more on training days and slightly less on rest days while keeping your weekly calorie average at your goal target. It aligns fuel availability with actual energy demand and is particularly useful for people doing high-intensity resistance or cardio training.
A simple implementation used by many coaches and athletes: on training days, eat 200 calories above your daily target (directing those extra calories toward carbohydrates to fuel the session). On rest days, eat 200 calories below the target. Your weekly average stays exactly on goal, but your body gets more fuel when it needs it and fewer excess calories when it doesn't.
This calculator's results card shows your training-day and rest-day targets automatically based on your goal calorie figure, so you can implement this without any extra math.
How to Hit Your Calorie Target and Why the Quality of Calories Matters
A calorie target tells you how much to eat. The macronutrient split tells you what to eat within that number. Both matter, and for different reasons. Two people eating 1,800 calories per day can have completely different body composition results depending on how much of those calories come from protein versus carbohydrates versus fat.
| Macronutrient | kcal per gram | Primary Role | Recommended for weight loss |
|---|---|---|---|
| Protein | 4 kcal/g | Muscle repair, satiety, thermogenesis | 1.6–2.2 g per kg of body weight |
| Carbohydrates | 4 kcal/g | Primary fuel for brain and muscles | Moderate; prioritize around training |
| Fat | 9 kcal/g | Hormone production, fat-soluble vitamins | At least 0.8 g per kg; don't go below 20% |
The most important macronutrient decision during weight loss
Prioritize protein first. Research consistently shows that higher protein intakes during a calorie deficit preserve more lean muscle mass compared to lower protein intakes at the same calorie level. Aim for at least 1.6 g per kg of body weight per day, and go as high as 2.2 g/kg if you're doing resistance training. Fill the remaining calories with carbohydrates and fat in proportions that make the diet sustainable for you personally.
Daily Calorie Recommendations by Country - How Guidelines Differ
Quick Answer
Published daily calorie guidelines vary by country. The US Dietary Guidelines suggest 1,600–2,400 kcal for adult women and 2,000–3,000 kcal for adult men depending on age and activity. The UK's NHS uses 2,000 kcal for women and 2,500 kcal for men as standard reference values. These are population averages for food labeling and policy — not personalized targets. This calculator gives a personalized estimate based on your actual details, which is always more accurate than a national average figure.
National dietary guidelines are designed for food labeling and public health policy, not individual planning. They assume a notional "average adult" rather than your specific age, weight, height, and activity level. Understanding where your personalized TDEE sits relative to your country's reference value can help you contextualize your result.
| Country / Region | Reference Intake (Women) | Reference Intake (Men) | Source |
|---|---|---|---|
| United States | 1,600–2,400 kcal/day | 2,000–3,000 kcal/day | USDA Dietary Guidelines 2020–2025 |
| United Kingdom | 2,000 kcal/day | 2,500 kcal/day | NHS / UK DRVs |
| Canada | 1,900–2,100 kcal/day | 2,300–2,600 kcal/day | Health Canada DRI |
| Australia / New Zealand | 2,000 kcal/day | 2,500 kcal/day | NHMRC Estimated Energy Requirements |
| European Union | 2,000 kcal/day | 2,500 kcal/day | EFSA Reference Values |
Why your personal estimate will differ from these figures
National reference values are fixed numbers designed for the average adult. Your actual estimated calorie needs depend on your individual age, weight, height, and activity level — all of which the formulas in this calculator account for. A 22-year-old male construction worker and a 60-year-old sedentary male both fall under the same "2,500 kcal" UK reference, but their actual needs may differ by 1,000 kcal or more. Always use a personalized calculator rather than a national average for real dietary planning.
Common Mistakes When Using a Calorie Calculator
Selecting an activity level that's one or two steps too high
The single most common error. Most office workers with three gym sessions per week are lightly active or, at most, moderately active, not very active. Choosing the wrong level inflates the TDEE by 200–400 calories, which erases the intended deficit entirely.
Not recalculating after significant weight loss
As you lose weight, your BMR decreases because there is less body mass to maintain. The calorie target that created a 500-calorie deficit at 90 kg will create a much smaller deficit at 75 kg, which is why weight loss often slows at the same intake. Recalculate every 4–6 weeks during active fat loss.
Treating the formula result as exact rather than a starting estimate
All BMR formulas have built-in population averages that produce results within ±10–15% of actual measured metabolic rate for most people. The formula gives you a starting point. Actual results from tracking your weight for two to four weeks give you real data. Trust the data over the formula when they conflict.
Setting an extreme deficit and losing muscle, not fat
Deficits above 1,000 calories per day accelerate muscle breakdown, which lowers BMR, making future fat loss harder. They also increase hunger hormones, making adherence harder. A moderate 300–500 calorie deficit with adequate protein produces slower but more sustainable results with far less muscle loss.
Tracking calories in but ignoring calories out variability
Your TDEE changes daily based on non-exercise activity, sleep quality, and stress hormones, even if your planned exercise stays constant. This is why a weekly calorie average is a more reliable metric than hitting the same number every single day.
A Practical 4-Week Action Plan After Getting Your Calorie Target
Getting the number is step one. Using it consistently is what actually produces results.
- 1
Week 1: Hit your calorie target at least 5 out of 7 days
Don't aim for perfection in week one. Aim for consistency. Five days out of seven at your target is far more valuable than three perfect days followed by a rebound.
- 2
Week 2: Confirm your protein target first, then fill with carbs and fat
Hit your protein gram target every day before worrying about the carb-fat split. Protein protects muscle mass and controls hunger better than any other macro.
- 3
Week 3: Weigh yourself daily and track the weekly average
Daily weight fluctuates by 0.5–2 kg due to water, food volume, and hormones. Only the weekly average tells you if body fat is actually changing. Compare week 3's average to week 1's average.
- 4
Week 4: Adjust based on real data, not guesswork
If your weekly average moved in the right direction: keep the current target. If it didn't move: reduce by 100–200 kcal or increase activity. If it moved too fast (over 1 kg/week lost): add 100–200 kcal to protect muscle mass.
Frequently Asked Questions
Quick Reference
Activity Multipliers
Safe Calorie Ranges
Below these minimums risks nutrient deficiencies regardless of goal.
Calculator Features
3 BMR Formulas
Mifflin, Harris-Benedict, and Katch-McArdle
Calorie Cycling
Training day and rest day targets
Full Macro Breakdown
Protein, carbs, and fat in grams
CSV Export + Print
Download or print your results
Tips for Better Results
Start one activity level lower than you think — adjust after 3 weeks
Weigh daily and track the 7-day average, not single readings
Hit your protein target before filling carbs and fat
Recalculate every 4–6 weeks during active fat loss
A 250–500 kcal deficit beats extreme restriction every time