BMI Calculator
Calculate your Body Mass Index (BMI) instantly. Supports metric and imperial units, shows category, healthy weight range — free online health tool.
Your Measurements
Your Result
Enter height and weight to see your BMI
About This Tool
- BMI = weight (kg) / height (m) squared — the standard WHO formula
- Real-time calculation as you type — no button clicks needed
- Supports both metric (kg/cm) and imperial (lbs/inches) units
- Completely free with no registration required
Frequently Asked Questions
BMI (Body Mass Index) is a simple measure of body fat based on height and weight. It is widely used by healthcare professionals to screen for weight categories that may lead to health problems.
BMI is calculated by dividing your weight in kilograms by the square of your height in meters: BMI = kg/m². For imperial units, the formula is: BMI = (lbs x 703) / inches².
Underweight is below 18.5, Normal weight is 18.5–24.9, Overweight is 25–29.9, and Obese is 30 or above. These ranges are defined by the World Health Organization (WHO).
BMI does not distinguish between muscle and fat mass. Athletes may have a high BMI due to muscle. It also does not account for age, gender, ethnicity, or body fat distribution. Always consult a healthcare professional.
Yes, completely free with no registration. Calculate your BMI as many times as you want with no limits or ads blocking your results.