BMI Calculator

BMI (Body Mass Index) is an internationally recognized measure of body composition based on height and weight. Calculated using the formula BMI = weight(kg) ÷ height(m)², it is classified according to standards set by the WHO (World Health Organization).

This tool calculates your BMI instantly by entering your height, weight, age, and gender. It supports both WHO standards and Japanese Obesity Society classifications, presenting results in easy-to-understand categories with color-coded indicators.

Additionally, it displays your standard weight (BMI 22) and healthy weight range (BMI 18.5–25) for your height. BMI 22 is considered statistically optimal for disease prevention, making it a useful reference for health management.

All data is processed entirely in your browser — your personal information is never sent to any server.