BMI Calculator – Free Body Mass Index Tool

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What is a BMI Calculator?

A BMI (Body Mass Index) Calculator is a health tool that estimates whether you are at a healthy weight for your height. It uses standard medical formulas to classify your weight into categories like Underweight, Normal, Overweight, or Obese.

Why We Built This (And Why You Can Trust It)

There are hundreds of BMI calculators online, but many of them are plastered with weight-loss ads or ask for your email address. We built this 100% free, private alternative that runs locally in your browser. Your height and weight data never leaves your device.

How to Use the BMI Calculator

1. Enter your height in centimeters (cm).

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2. Enter your weight in kilograms (kg).

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3. Click calculate to instantly see your BMI score.

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4. The tool will also highlight which weight category your score falls into.

Common Use Cases

• **Fitness Tracking:** Establish a baseline metric before starting a new diet or exercise regimen.
• **Health Check-ins:** Quickly see if your weight falls within the generally accepted 'normal' range.
• **Medical Estimates:** Provide a rough estimate of body mass for general health awareness.

Frequently Asked Questions

Is BMI an accurate measure of health?

BMI is a general screening tool, not a diagnostic one. It does not account for muscle mass, bone density, or fat distribution. Athletes often have high BMIs despite having low body fat.

Does this tool save my health data?

Absolutely not. The calculation is performed entirely client-side using JavaScript. We have no access to the numbers you type in.

What is a normal BMI score?

According to the World Health Organization (WHO), a normal BMI falls between 18.5 and 24.9.