Smart Calculations, Smarter Decisions
Check your body mass index with WHO classification, health risk assessment, and ideal weight range. No registration. Works offline.
Check Your BMI Free →Body Mass Index (BMI) is a screening tool that estimates body fat based on height and weight. It's calculated as weight (kg) divided by height (m) squared. A BMI of 18.5-24.9 is considered normal, 25-29.9 is overweight, and 30+ is obese according to WHO classifications. It's widely used because it requires no special equipment — just a scale and a measuring tape.
However, BMI has important limitations. It doesn't distinguish between muscle and fat (a bodybuilder and an obese person can have the same BMI), doesn't account for age or gender differences in body composition, and uses different thresholds for Asian populations (WHO recommends 23+ as overweight for Asians vs 25+ for Western populations). It's a starting point, not a diagnosis.
Our BMI calculator supports both metric (kg/cm) and imperial (lbs/inches) units, shows your WHO category with health risk interpretation, provides your ideal weight range, and includes Asian-specific thresholds. It takes 2 seconds to check — and while BMI alone isn't definitive, it's a useful data point to track alongside other health metrics.
BMI is calculated by dividing your weight in kilograms by your height in meters squared: BMI = weight (kg) / height (m)². For imperial units: BMI = (weight in lbs × 703) / (height in inches)².
According to the WHO, a healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese. BMI doesn't account for muscle mass, age, or body composition.
Yes, completely free with no registration. Your data never leaves your device — all calculations happen locally in your browser. It even works offline.