BMI Calculator
Calculate your Body Mass Index with health category classification and risk assessment.
FAQ
BMI Calculator FAQ
What is BMI?
Body Mass Index (BMI) is a measurement that uses your height and weight to estimate whether you are underweight, normal weight, overweight, or obese. Formula: BMI = weight(kg) / height(m)².
What are the BMI categories?
Underweight: below 18.5, Normal weight: 18.5–24.9, Overweight: 25–29.9, Obese Class I: 30–34.9, Obese Class II: 35–39.9, Obese Class III: 40 and above.
Is BMI accurate for everyone?
BMI is a useful screening tool but has limitations. It does not account for muscle mass, bone density, age, sex, or body composition. Athletes may have high BMI but low body fat.
Should I use metric or imperial units?
Our calculator uses metric units (kg for weight, cm for height). To convert: 1 pound = 0.453 kg, 1 inch = 2.54 cm, 1 foot = 30.48 cm.
Is this medical advice?
No. This tool provides informational estimates only. Always consult a healthcare professional for medical advice about your weight, health, or fitness goals.
Free BMI Calculator with Health Categories
Calculate your Body Mass Index (BMI) instantly using our free online calculator. Enter your height and weight to get your BMI score along with the corresponding health category: underweight (below 18.5), normal weight (18.5–24.9), overweight (25–29.9), or obese (30+). The BMI formula divides weight in kilograms by height in meters squared. While BMI is a useful screening tool, it does not account for muscle mass or body composition — always consult a healthcare professional for personalized health advice.
How to Use This Tool
- Enter your height in centimeters.
- Enter your weight in kilograms.
- View your BMI score and health category classification.
Key Features
- Instant BMI calculation using the standard formula
- Color-coded health category classification
- Visual BMI scale indicator
- Healthy weight range for your height
- Educational information about BMI limitations
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