BMI Calculator

Lifestyle

Body Mass Index calculator

The BMI Calculator computes your Body Mass Index, a widely used screening measure that relates your weight to your height. It helps you understand whether your weight falls within the underweight, normal, overweight, or obese range according to standard health classifications.

You can toggle between metric (kilograms and centimeters) and imperial (pounds and feet/inches) units. After entering your measurements, the tool calculates your BMI, displays the numeric result, and shows which health category you fall into with a color-coded indicator. A visual scale provides an intuitive reference of where your BMI sits on the spectrum.

BMI is a general screening tool and does not directly measure body fat. Factors like muscle mass, bone density, age, and sex affect its accuracy. It is most useful as a quick health indicator and starting point for further discussion with a healthcare provider.

How to Use

1. Select your preferred unit system: Metric (kg/cm) or Imperial (lbs/ft).
2. Enter your weight in the weight field.
3. Enter your height in the height field (centimeters for metric, or feet and inches for imperial).
4. Your BMI value and health category appear instantly.
5. Check the visual color-coded scale to see where your BMI falls.
6. Refer to the category classification: Underweight (below 18.5), Normal (18.5\u201324.9), Overweight (25\u201329.9), Obese (30+).

Features

• Metric and imperial unit support
• Real-time BMI calculation as you type
• Color-coded health category: blue (underweight), green (normal), amber (overweight), red (obese)
• Visual BMI scale with animated pointer
• Clear category labels with BMI ranges
• Smooth animations for result display

Frequently Asked Questions

What is a healthy BMI range?

According to the World Health Organization, a BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is classified as obese.

Is BMI accurate for athletes?

BMI does not distinguish between muscle and fat. Athletes with high muscle mass may have a high BMI while being in excellent health. For such cases, body fat percentage measurements are more informative.

Does BMI apply to children?

BMI interpretation for children and teens uses age- and sex-specific percentile charts rather than the fixed adult ranges. This tool uses the standard adult classification.

Is my data stored anywhere?

No. Your weight and height are processed entirely in your browser and are never sent to any server.