BMI Calculator

BMI — Body Mass Index — is calculated by dividing weight in kilograms by the square of height in metres. The result places you in one of four WHO categories: Underweight (below 18.5), Healthy weight (18.5–24.9), Overweight (25–29.9), or Obese (30 and above). It's the screening tool doctors, insurers and researchers use globally as a first approximation of weight-related health risk.

This calculator supports both metric (kg and cm) and imperial (pounds, feet and inches), converting automatically so the result is identical regardless of which unit system you use. Beyond the BMI number and category, it tells you the healthy weight range for your specific height — the actual numbers, not just a percentile — which is the practical figure most people want from the calculation.

One important caveat, displayed on the tool: BMI is a population-level screening tool, not a personal diagnosis. It doesn't account for muscle mass, bone density, age, sex or ethnicity — a very muscular person may register as Overweight, and an older adult may carry metabolically risky weight within the Healthy range. Use it as one data point; a healthcare provider gives the full picture.