BMI & Daily Calorie Calculator
Calculate Body Mass Index, BMR, and Total Daily Energy Expenditure
Moderate exercise (3โ5x/week)
Note: Based on Korean obesity standards. Mifflin-St Jeor formula.
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Frequently Asked Questions
Q. What BMI range is considered healthy?
The WHO standard for healthy BMI is 18.5โ24.9. However, Asian health organizations (including Korea and Japan) use a lower threshold: normal is 18.5โ22.9, overweight is 23โ24.9, and obese is 25+. This tool applies the Asian standard.
Q. How many calories do I need per day?
Daily calorie needs (TDEE) are calculated from BMR (Basal Metabolic Rate) ร activity multiplier. A sedentary adult needs roughly 1,600โ2,000 kcal; an active adult may need 2,500โ3,000 kcal. This tool calculates your personal TDEE.
Q. How much should I eat to lose 1 kg per week?
One kilogram of body fat โ 7,700 kcal. To lose 1 kg per week, you need a daily caloric deficit of ~1,100 kcal. A more sustainable target is 0.5 kg/week (550 kcal deficit per day).
Q. Is BMI accurate for athletes and muscular people?
No. BMI does not distinguish muscle mass from fat. Muscular athletes can appear "obese" by BMI despite having very low body fat. Combine BMI with body fat percentage for a more accurate assessment.
Q. What are the Asian BMI standards and why do they differ?
Asian populations tend to develop metabolic disease at lower BMI levels than Western populations. Japan and Korea define overweight as BMI โฅ 23 vs. the WHO standard of โฅ 25. This tool uses the Asian standard.
Q. Does ideal calorie intake change with age?
Yes. Basal metabolic rate (BMR) decreases roughly 1โ2% per decade after age 20. This means a 50-year-old needs about 10โ15% fewer calories than a 25-year-old at the same weight and activity level.
How to Use
Input your height (cm) and weight (kg).
These factors affect BMR (Basal Metabolic Rate) calculation accuracy.
Choose from sedentary, lightly active, moderately active, very active, or extra active.
See your BMI, BMI category (Asian standard), daily calorie maintenance, and calorie targets for weight loss or gain.
Expert Knowledge: BMI & Calorie Calculator
BMI (Body Mass Index) was developed by Belgian statistician Adolphe Quetelet in the 1830s as a population-level measurement tool, not as an individual health assessment. Despite its widespread use, major limitations include failure to distinguish muscle from fat, inability to capture fat distribution (visceral vs. subcutaneous), and different risk thresholds across ethnicities.
Research published in The Lancet and Obesity Reviews shows that Asian populations develop insulin resistance, type 2 diabetes, and cardiovascular disease at BMI levels 3โ5 units lower than Western populations. The Korean Society for the Study of Obesity defines overweight as BMI 23โ24.9 and obesity as BMI โฅ 25 โ much stricter than the global WHO threshold. This tool applies these Korean/Asian standards.
For comprehensive body composition assessment, BMI should be combined with: (1) Waist circumference (risk threshold: 80cm for women, 90cm for men in Korea), (2) Body fat percentage (assessed via DEXA scan, bioelectrical impedance, or skinfold calipers), and (3) Visceral fat level (assessed via CT scan or bioimpedance devices). These metrics together provide a far more accurate picture of metabolic health than BMI alone.
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