Calorie Calculator — Daily Intake, BMR & Weight Management
Calculate your daily calorie needs using BMR and activity level. Compare intake vs. burned to plan weight loss, gain, or maintenance.
Calorie Calculator
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Enter Values
Body Mass Index (BMI)
22.9 kg/m²
Daily Calories for Weight Maintenance
1,979 kcal/day
Daily Calorie Surplus
+22 kcal/day
Projected Weekly Weight Change
▼ +0.02 kg/week
Scenario Comparison
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Recommended Macro Distribution (based on TDEE)
BMR vs. Activity Energy
BMR
1,649 kcal
At complete rest
TDEE
1,979 kcal
Total daily burn
BMI
22.9 kg/m²
Body Mass Index
+22 kcal/day · Projected: +0.02 kg/week
Activity Level: Sedentary (BMR x 1.2) · Formula: Mifflin-St Jeor
The Formula
TDEETotal calories burned per day, including BMR plus physical activity and the thermic effect of food. Used for weight management. is the total number of calories your body burns in a day, calculated by multiplying your BMRThe number of calories your body needs at complete rest to maintain vital functions like breathing, circulation, and cell production. (calories at complete rest) by an activity factor. Comparing your actual intake to your TDEETotal calories burned per day, including BMR plus physical activity and the thermic effect of food. Used for weight management. reveals your calorie deficit or surplus, which directly determines whether you lose, maintain, or gain weight.
Variable Definitions
Weight (kg)
Total body weight in kilograms. Heavier individuals have higher BMR and TDEE.
Height (cm)
Height in centimeters. Taller individuals have higher BMR due to greater body surface area.
Age
Age in years. BMR decreases ~2% per decade after age 20 due to muscle loss.
Activity Factor
Multiplier from 1.2 (sedentary) to 1.9 (very active) that accounts for all physical activity on top of BMR.
How to Use This Calculator
- 1
Select your unit system (Metric or Imperial) and enter your gender.
- 2
Enter your age, weight, and height. Choose the activity level that best matches your typical weekly routine.
- 3
Optionally enter your daily calorie intake to see whether you are in a deficit or surplus compared to your TDEE.
- 4
Review your BMR, TDEE, BMI, and projected weekly weight change to plan your nutrition and fitness goals.
- 5
Adjust your activity level or daily intake to model different scenarios and find a sustainable calorie target.
Quick Reference
| From | To |
|---|---|
| Sedentary (desk job) | BMR × 1.2 |
| Light Exercise (1-2 days/wk) | BMR × 1.375 |
| Moderate Exercise (3-5 days/wk) | BMR × 1.55 |
| Active (6-7 days/wk) | BMR × 1.725 |
| Very Active (physical + training) | BMR × 1.9 |
| 1 kg body fat | ~7,700 kcal |
| Safe weight loss rate | 0.5-1 kg per week (500 kcal/day deficit) |
Common Applications
- Weight loss planning — set a personalized calorie deficit to lose 0.5-1 kg per week while preserving muscle mass by tracking daily intake against TDEETotal calories burned per day, including BMR plus physical activity and the thermic effect of food. Used for weight management.
- Weight gain / muscle building — calculate the calorie surplus needed for lean mass gains (typically +250-500 kcal above TDEETotal calories burned per day, including BMR plus physical activity and the thermic effect of food. Used for weight management.) with adequate protein intake
- Weight maintenance — determine your exact maintenance calories and adjust intake on training vs. rest days to stay at a stable, healthy weight
- Fitness benchmarking — track your BMRThe number of calories your body needs at complete rest to maintain vital functions like breathing, circulation, and cell production. and TDEETotal calories burned per day, including BMR plus physical activity and the thermic effect of food. Used for weight management. over time to measure how changes in body composition and activity level affect your energy expenditure
Weight change is determined by the balance between calories consumed and calories expended. A daily deficit of ~500 kcal leads to ~0.5 kg weight loss per week.
Pro Tips
Use a food scale for at least 2 weeks when starting calorie tracking — most people underestimate portion sizes by 30-50% when eyeballing. A digital kitchen scale costs under $20 and is the single most impactful tool for accurate calorie tracking.
Set your activity level one notch lower than your instinct tells you. Most people overestimate their activity. If you exercise 3-5 days/week but have a desk job, you are likely "Light Exercise" (1.375), not "Moderate" (1.55). Being conservative prevents accidental over-eating.
Recalculate your TDEE every 5 kg (11 lbs) of weight change. A 10 kg weight loss reduces TDEE by roughly 100-150 kcal/day — failing to adjust is a common cause of plateaus and regain.
Do not eat back all exercise calories. Fitness trackers and machines typically overestimate calorie burn by 20-40%. If your watch says you burned 500 kcal running, consider eating back only 250-300 kcal to maintain your planned deficit.
Track the trend, not the daily number. Daily scale weight fluctuates 0.5-2 kg from water retention (salt, carbs, hormones, inflammation). Use a 7-day rolling average and look at the direction over 3-4 weeks — not day to day.
Prioritize protein during a calorie deficit. Eating 1.6-2.2 g of protein per kg of body weight helps preserve lean muscle mass when dieting. More muscle means a higher BMR, creating a positive feedback loop for long-term weight management.
Understanding the Concept
Your daily calorie needs are determined by two primary factors: your Basal Metabolic Rate (BMRThe number of calories your body needs at complete rest to maintain vital functions like breathing, circulation, and cell production.) and your activity level. BMRThe number of calories your body needs at complete rest to maintain vital functions like breathing, circulation, and cell production. is the number of calories your body burns at complete rest to sustain vital functions such as breathing, circulation, cell repair, and temperature regulation. The Mifflin-St Jeor equation, developed in 1990 from a sample of 498 healthy adults, is considered the most accurate formula for estimating BMRThe number of calories your body needs at complete rest to maintain vital functions like breathing, circulation, and cell production. in the general population. For men, BMRThe number of calories your body needs at complete rest to maintain vital functions like breathing, circulation, and cell production. = 10 × weight(kg) + 6.25 × height(cm) - 5 × age + 5. For women, BMRThe number of calories your body needs at complete rest to maintain vital functions like breathing, circulation, and cell production. = 10 × weight(kg) + 6.25 × height(cm) - 5 × age - 161. To find your Total Daily Energy Expenditure (TDEETotal calories burned per day, including BMR plus physical activity and the thermic effect of food. Used for weight management.), multiply your BMRThe number of calories your body needs at complete rest to maintain vital functions like breathing, circulation, and cell production. by an activity factor ranging from 1.2 (sedentary) to 1.9 (very active). Your TDEETotal calories burned per day, including BMR plus physical activity and the thermic effect of food. Used for weight management. represents the number of calories needed to maintain your current weight. If you consume fewer calories than your TDEETotal calories burned per day, including BMR plus physical activity and the thermic effect of food. Used for weight management., you are in a calorie deficit, which leads to weight loss. A deficit of approximately 500 kcal per day results in roughly 0.5 kg (1 lb) of weight loss per week, as 1 kg of body fat contains about 7,700 kcal. Conversely, consuming more than your TDEETotal calories burned per day, including BMR plus physical activity and the thermic effect of food. Used for weight management. creates a surplus, leading to weight gain. The key to sustainable weight management is understanding your individual energy balance and making gradual, consistent adjustments rather than drastic calorie restrictions that can slow metabolism and cause muscle loss.
Worked Examples
A 30-year-old woman, 165 cm tall, weighing 65 kg, exercises moderately 3-5 days per week and wants to lose weight. She currently eats about 2,000 kcal/day and has been frustrated by a weight loss plateau.
Female
30
65 kg
165 cm
Moderate (1.55)
Result: BMR: 1,403 kcal/day. TDEE: 2,175 kcal/day. At 2,000 kcal/day intake, her deficit is only 175 kcal/day — meaning roughly 0.16 kg/week weight loss, easily masked by water weight fluctuations.
Insight: Her plateau makes sense mathematically. With a daily deficit of only 175 kcal, it would take 44 days to lose 1 kg of body fat. At this rate, normal daily weight fluctuations of 0.5-1.5 kg from water, food, and waste completely hide the fat loss on the scale. To lose 0.5 kg/week (a visible and motivating rate), she needs a 500 kcal/day deficit — meaning she should eat about 1,675 kcal/day, or increase her activity to burn 325 more calories daily while eating 2,000 kcal. The calculator reveals that her "plateau" is actually slow but real progress, and a modest adjustment will produce visible results.
A 22-year-old male athlete, 180 cm, 75 kg, trains 6 days/week at high intensity. He wants to gain 5 kg of lean muscle over the next 4 months and currently eats about 2,800 kcal/day.
Male
22
75 kg
180 cm
Very Active (1.9)
Result: BMR: 1,811 kcal/day. TDEE: 3,441 kcal/day. He is currently eating 2,800 kcal — a deficit of 641 kcal below TDEE. To gain lean mass, he needs a 250-500 kcal surplus above TDEE: 3,691-3,941 kcal/day.
Insight: The calculator reveals a critical problem: this athlete is severely under-eating for his activity level. He is in a significant calorie deficit (-641 kcal/day) while trying to gain weight — physiologically impossible. He would actually be losing weight at his current intake. To gain 5 kg over 16 weeks (0.31 kg/week), he needs roughly a 340 kcal daily surplus, putting his target at approximately 3,780 kcal/day — nearly 1,000 kcal more than he currently eats. He should increase intake gradually over 2-3 weeks to allow digestive adaptation, focusing on calorie-dense nutritious foods (nuts, avocado, olive oil, whole grains, dried fruit) rather than junk food.
A 45-year-old sedentary office worker, 175 cm, 90 kg, wants to understand his maintenance calories and how adding a daily 30-minute walk would affect his energy balance. He does no structured exercise currently.
Male
45
90 kg
175 cm
Sedentary (1.2)
Result: BMR: 1,838 kcal/day. TDEE: 2,206 kcal/day (sedentary). Adding a 30-minute daily brisk walk burns ~150 extra kcal and shifts activity factor to ~1.325, yielding a new TDEE of ~2,435 kcal/day — a 229 kcal/day increase.
Insight: This is an empowering result: a single 30-minute daily walk increases his TDEE by 229 kcal/day. Over a year, that is 83,585 kcal — equivalent to about 10.9 kg (24 lbs) of body fat, assuming no change in diet. Even a modest addition of daily walking, sustained over months and years, has a profound cumulative effect. This illustrates that sustainable weight management does not require extreme exercise or drastic dieting — small, consistent changes compound dramatically. If he also reduced his intake by 250 kcal/day (e.g., cutting out one soda or snack), the combined 479 kcal/day deficit would produce roughly 0.45 kg/week of weight loss.
Limitations
- This calculator uses the Mifflin-St Jeor equation, which estimates BMR within ±10% for about 70% of the population. Individual BMR can differ by 200-300 kcal/day due to genetics, body composition, hormonal status, and thyroid function. A lab-measured RMR (indirect calorimetry) is the gold standard if you need precise values for medical or athletic purposes.
- The activity factors (1.2-1.9) are broad population averages and do not capture individual variation. Two people who both "exercise 3-5 days/week" can have TDEEs that differ by 300-500 kcal due to exercise intensity, non-exercise activity thermogenesis (NEAT), occupation, and genetic differences in movement efficiency.
- This calculator does not account for metabolic adaptation (adaptive thermogenesis). When you maintain a calorie deficit for extended periods, your body reduces BMR by 5-15% beyond what weight loss alone would predict — an evolutionary survival response. Diet breaks, reverse dieting, and cycling between deficit and maintenance phases can help mitigate this effect.
- The 7,700 kcal per kg of body fat rule (3,500 kcal per pound) is a useful approximation that becomes less accurate as weight loss progresses. In reality, the energy content of body fat changes with body composition, and the body catabolizes some lean mass alongside fat. Expect slightly slower progress than the formula predicts, especially as you get leaner.
- When not to use: This calculator provides educational estimates and is not a substitute for professional medical or nutritional advice. Do not use this calculator if you have an eating disorder, are pregnant or breastfeeding, have a metabolic condition (diabetes, thyroid disorders), or are under 18. Consult a registered dietitian or healthcare provider for personalized nutrition guidance, especially for medical weight management.
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