🫃 BMI Calculator
Calculate BMI from height and weight
Calculator
Your BMI
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Category
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Features
Simply enter your height and weight to automatically calculate your BMI (Body Mass Index). Results are displayed in four categories based on Japan Obesity Society standards: 'Underweight', 'Normal weight', 'Overweight', and 'Obese'.
How to Use
Enter your height (cm) and weight (kg) to instantly see your BMI value and category. Decimal values are accepted for precise measurements.
Use Cases
Check your BMI before or after health checkups, set goals for diet or fitness training, find your ideal weight target, or track your daily weight management.
FAQ
Q: What is BMI? A: Body Mass Index is calculated as weight(kg) ÷ height(m)². It's an internationally recognized measure of body fat based on height and weight. Q: Are Japanese standards different from international ones? A: Yes. While WHO defines obesity as BMI ≥30, Japan Obesity Society sets it at BMI ≥25, with 18.5-25 as normal weight. This is because Asians face higher health risks at lower BMI levels compared to Western populations. Q: What are BMI's limitations? A: BMI doesn't account for body fat percentage, so athletes with high muscle mass may show elevated values. Also, visceral fat levels can vary at the same BMI. Consider using body composition scales as well. Q: What is the ideal BMI? A: Japan Obesity Society considers 22 as the standard. BMI of 22 is associated with the lowest risk of disease. Q: How is BMI interpreted for children? A: Children's body composition changes with growth, so adult standards don't apply. Age-appropriate indices like Kaup Index (infants) or Rohrer Index (school children) are used instead.
Tips
BMI was developed by Belgian statistician Adolphe Quetelet in the 19th century, originally called 'Quetelet Index.' Japan Obesity Society established current standards in 1999. BMI 22 is considered 'ideal weight,' calculated as height(m)² × 22. For example, someone 170cm tall would have an ideal weight of 1.7² × 22 ≈ 63.6kg. In health checkups, BMI is combined with waist circumference to assess metabolic syndrome.