BMI Calculator

Calculate your Body Mass Index (BMI) to check if your weight is in a healthy range. Supports both metric (kg/cm) and imperial (lbs/ft) units.

⚠This tool provides general estimates only and is not a substitute for professional medical advice. Always consult a healthcare provider for personalized guidance.

Enter your height and weight, then click Calculate BMI to see your results.

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BMI Categories

UnderweightBelow 18.5
Normal weight18.5 — 24.9
Overweight25 — 29.9
Obese (Class I)30 — 34.9
Obese (Class II+)35+

How to Use the BMI Calculator

  1. Choose your unit system — Metric (kg/cm) or Imperial (lbs/ft).
  2. Enter your height — In centimeters or feet and inches.
  3. Enter your weight — In kilograms or pounds.
  4. Click "Calculate BMI" to see your BMI number, category, and healthy weight range.

BMI (Body Mass Index) is a simple measure using your height and weight. Formula: weight(kg) / height(m)—. While BMI is a useful screening tool, it does not account for muscle mass, bone density, or body composition. Consult a healthcare provider for a complete health assessment.

What Is BMI and Why Does It Matter?

Body Mass Index (BMI) is a numerical value calculated from your weight and height. Developed by Belgian mathematician Adolphe Quetelet in the 1830s, BMI provides a quick screening method to categorize individuals as underweight, normal weight, overweight, or obese. The formula divides weight in kilograms by the square of height in meters: BMI = kg/m².

BMI Categories (WHO Standards)

Underweight: BMI below 18.5 — may indicate nutritional deficiency or underlying health issues. Normal weight: BMI 18.5–24.9 — associated with the lowest health risks. Overweight: BMI 25–29.9 — increased risk of cardiovascular disease and type 2 diabetes. Obese: BMI 30 or higher — significantly elevated risk of chronic diseases including heart disease, stroke, and certain cancers.

Limitations of BMI

BMI does not distinguish between muscle and fat mass. Athletes and bodybuilders may have a high BMI despite being healthy. Similarly, older adults may have a normal BMI but carry excess body fat. For a comprehensive health assessment, BMI should be considered alongside other measurements such as waist circumference, body fat percentage, blood pressure, and blood sugar levels. Always consult a healthcare professional for personalized advice.