Need to Convert Units?
Use our Unit Converter to change pounds to kg or feet/inches to cm.Check your Body Mass Index (BMI) to get a general idea of your weight status. Our simple calculator helps you understand where you fall on the BMI scale.
Your BMI value and the corresponding weight category (e.g., Normal weight, Overweight) will be displayed instantly.
Disclaimer: BMI is a general indicator and does not account for factors like muscle mass. Consult a healthcare professional for personalized health advice.Need to Convert Units?
Use our Unit Converter to change pounds to kg or feet/inches to cm.According to the World Health Organization (WHO), a BMI between 18.5 and 24.9 is generally considered to be in the healthy weight range for most adults. A BMI below 18.5 is considered underweight, and a BMI of 25 or above is considered overweight.
No. All calculations are performed on your device in your browser. The height and weight you enter are never sent to our servers, ensuring your health information remains completely private.
BMI is a useful population-level measure but may not be accurate for all individuals. It does not distinguish between fat and muscle mass. Therefore, very muscular individuals (like athletes) may have a high BMI but low body fat. It should be used as a general guide, not a definitive health assessment.
Body Mass Index (BMI) is a widely used measure that provides a general indication of whether your weight is healthy in proportion to your height. The BMI Calculator from NexaPrep Tools is a free, simple, and private online tool that helps you calculate your BMI instantly. By entering your weight and height, you can get your BMI score and see which category you fall into, such as underweight, normal weight, or overweight. It's a useful starting point for understanding your health, and all calculations are performed privately in your browser, with no data ever being saved.
While not a perfect diagnostic tool, BMI is a valuable and easy-to-calculate indicator for a variety of reasons.
Our tool provides instant results as you enter your measurements:
As soon as both values are entered, the output area will automatically update to show your calculated BMI score and the corresponding weight category, color-coded for easy interpretation.
BMI is calculated using a simple and standard formula:
BMI = Weight (kg) / [Height (m)]^2
Our calculator takes your height in centimeters, converts it to meters (by dividing by 100), squares it, and then divides your weight in kilograms by this result. This ensures the calculation is accurate and adheres to the standard definition of BMI.
It is essential to understand the limitations of BMI. BMI does **not** directly measure body fat and does not account for the difference between muscle and fat. This means:
Your health information is highly personal. The NexaPrep Tools BMI Calculator is a 100% client-side tool. The weight and height you enter are processed by a script running in your browser on your own device. This data is never sent to our servers, logged, or stored. You can use our calculator with the complete confidence that your personal health data remains private.
Body Mass Index (BMI) is a simple numerical measure calculated from your height and weight. It is widely used as a screening tool to categorize body weight into health categories. It was developed by Belgian mathematician Adolphe Quetelet.
BMI = Weight (kg) / Height² (m²)
Or in imperial: BMI = 703 × Weight (lbs) / Height² (inches²)
Use BMI as one of several health indicators — not the sole determinant. Always consult a doctor for complete health assessment.
Body Mass Index (BMI) is calculated from your height and weight, and is widely used as a screening tool to categorize body weight into health ranges.
BMI = Weight (kg) / Height² (m²)
Use BMI as one of several health indicators — always consult a doctor for complete health assessment.
Our free BMI calculator supports both metric (kg/cm) and imperial (lbs/inches) units, making it useful for users across the USA, UK, Canada, and Australia. Check your BMI against WHO standard categories and understand what your score means for your health.