BMI Calculator
Calculate your Body Mass Index (BMI) instantly. Check your weight category with a visual gauge. Supports metric (kg/cm) and imperial (lbs/ft).
| BMI Range | Category | Health Risk |
|---|---|---|
| <18.5 | Underweight | Nutritional deficiency |
| 18.5–24.9 | Normal Weight | Low Risk ✓ |
| 25–29.9 | Overweight | Moderate Risk |
| 30–34.9 | Obese (Class I) | High Risk |
| 35+ | Obese (Class II/III) | Very High Risk |
What is BMI and Why It Matters
Body Mass Index (BMI) is a screening tool calculated from weight and height to assess whether a person falls into a healthy weight range. While BMI doesn't directly measure body fat, it correlates with health risks like diabetes, heart disease, and hypertension. Our free BMI calculator supports both metric (kg/cm) and imperial (lbs/ft/in) units and provides instant categorization and health insights.
How to Use This Calculator
Metric: Enter weight in kilograms and height in centimeters. Imperial: Enter weight in pounds and height as feet and inches. The calculator shows your BMI, category, and health risk level. Note: BMI doesn't account for muscle mass, so athletes may have a higher BMI despite low body fat.