BMI Calculator

Note: BMI is a screening tool, not a diagnostic measure. It doesn't account for muscle mass, bone density, or age. Consult a healthcare provider for a complete assessment.

How to Calculate Your Body Mass Index (BMI)

Body Mass Index (BMI) is a widely used screening tool that estimates whether a person has a healthy body weight for their height. Whether you are tracking a fitness journey, consulting with a healthcare provider, or just curious about your baseline metrics, our Free BMI Calculator provides instant, accurate results. Simply enter your height and weight, and the tool will instantly output your BMI score alongside the standard health classifications.

What is the normal, healthy BMI range?

According to the World Health Organization (WHO), the standard adult BMI classifications are categorized as follows:

• Underweight: BMI less than 18.5
• Normal weight: BMI is 18.5 to 24.9
• Overweight: BMI is 25 to 29.9
• Obese: BMI is 30 or greater

Note: While BMI is a helpful general indicator, it does not directly measure body fat percentage. Athletes with high muscle mass may have a high BMI without being unhealthy. Always consult a medical professional for personalized health advice.

Is my personal health data kept private?

Absolutely. Entering your physical metrics online can feel intrusive, which is why ToolsHub prioritizes your security. This calculator runs entirely locally within your web browser. We do not transmit, save, or store your height, weight, or calculated BMI on any external databases. Your data is yours alone.