BMI Calculator
Calculate your Body Mass Index instantly. See your category, healthy weight range, and a visual scale — no signup needed.
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BMI Categories
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | Below 18.5 | Nutritional deficiency risk |
| Normal | 18.5 – 24.9 | Lowest health risk |
| Overweight | 25.0 – 29.9 | Moderate risk |
| Obese | 30.0+ | High risk |
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Frequently Asked Questions
What is BMI and how is it calculated?
Body Mass Index (BMI) is calculated by dividing weight in kilograms by height in meters squared (kg/m²). For imperial: (weight in lbs × 703) ÷ (height in inches)². It's a screening tool for weight-related health issues.
Is BMI an accurate measure of health?
BMI is useful but has limitations. It doesn't distinguish between muscle and fat mass — athletes may have high BMI while being healthy. For a complete assessment, combine BMI with waist circumference, body fat %, and other markers.
What is a healthy BMI range?
A healthy BMI is generally 18.5–24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese. These are guidelines — individual health depends on fitness, muscle mass, and lifestyle.
How can I improve my BMI?
Focus on balanced nutrition and 150+ minutes of moderate exercise weekly. Eat whole foods, lean protein, and whole grains. Aim for 1–2 lbs/week change. Consult a healthcare provider for personalized guidance.