BMI Calculator — Body Mass Index Online
Calculate your BMI instantly. Supports metric (kg/cm) and imperial (lbs/inches). Get your health category and ideal weight range.
BMI Calculator
BMI Categories
| BMI Range | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 – 34.9 | Obese Class I |
| 35.0 – 39.9 | Obese Class II |
| ≥ 40.0 | Obese Class III |
⚠️ BMI is a screening tool, not a diagnostic. Consult a healthcare professional for personalized advice.
BMI FAQs
Body Mass Index (BMI) is a measure of body fat based on height and weight. It's calculated as weight (kg) ÷ height² (m²). A BMI of 18.5–24.9 is considered healthy for most adults.
BMI doesn't distinguish between muscle and fat, so athletes may have a "high" BMI despite low body fat. It's also less accurate for elderly people and children. Use it as a general guideline, not a definitive measure.
The standard BMI ranges (18.5–24.9 for normal weight) apply to both men and women. However, women naturally have higher body fat percentages, so context matters when interpreting the result.