Calculate your Body Mass Index instantly
Get quick BMI calculations, body weight categories, and personalized weight adjustments according to the World Health Organization (WHO) standards.
Enter your details
Provide your height and weight to calculate your Body Mass Index (BMI).
Calculated Result
You have a Normal Weight.
Weight Insights
Understanding your BMI
Body Mass Index (BMI) is a simple numerical calculation derived from your height and weight. It acts as an easy-to-use screening tool to categorize body weight and estimate potential health risk categories associated with underweight, overweight, or obesity.
While BMI is a useful benchmark for the general population, it does have limitations. It does not directly measure body fat or muscle mass. Highly muscular individuals, like athletes or bodybuilders, might have a high BMI despite having a low body fat percentage.
The BMI Formula
BMI = weight (kg) / height² (m²)BMI = 703 × weight (lbs) / height² (in²)Our calculator handles both conversion methods dynamically. Use the tabs to toggle between units instantly without losing your inputs.
WHO BMI classifications
| BMI Range (kg/m²) | Weight Category | Health Risk Association |
|---|---|---|
| Less than 18.5 | Underweight | Minimal to elevated risks (nutrient deficiencies) |
| 18.5 – 24.9 | Normal Weight | Optimal / Healthy (lowest risk profile) |
| 25.0 – 29.9 | Overweight | Increased risk (cardiovascular & metabolic stress) |
| 30.0 – 34.9 | Class I Obesity | High risk of cardiovascular disease, diabetes |
| 35.0 or higher | Severe Obesity | Very high / extreme clinical risk category |