Free BMI Calculator - Check Body Mass Index Online

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Weight

Height

Please enter valid values.

Your BMI Score

0.0

Normal

Your weight appears to be healthy.

15 18.5 25 30 40

Underweight

Normal

Overweight

Obese

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How to Use This BMI Calculator

Select Unit: Choose between "Metric" (Kilograms & Centimeters) or "Standard" (Pounds, Feet & Inches) using the toggle buttons at the top.
Enter Weight: Input your current weight in the selected unit.
Enter Height: Input your height. If using Standard units, use the separate fields for feet and inches.
Calculate: Click the "Calculate BMI" button.
Analyze: View your BMI score, health category, and see where you stand on the color-coded chart.

Why Check Your BMI?

Health Screening: BMI is a simple, inexpensive, and non-invasive screening method for weight categories.
Risk Assessment: High BMI correlates with higher risk of chronic diseases like heart disease, type 2 diabetes, and certain cancers.
Progress Tracking: It's a useful metric to track your weight loss or fitness journey over time.
Medical Standard: It is widely used by healthcare professionals as a preliminary health indicator.

Understanding Body Mass Index (BMI)

Body Mass Index (BMI) is a value derived from the mass (weight) and height of a person. It is defined as the body mass divided by the square of the body height, and is universally expressed in units of kg/m², resulting from mass in kilograms and height in metres.

BMI Categories Table

The World Health Organization (WHO) defines the following categories based on BMI scores for adults:

BMI Score	Classification
Below 18.5	Underweight
18.5 – 24.9	Normal Weight
25.0 – 29.9	Overweight
30.0 and Above	Obesity

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Limitations of BMI

While BMI is a useful screening tool, it does have limitations. It does not measure body fat directly. Therefore, it may categorize:

Athletes: Individuals with high muscle mass may be classified as overweight even though their body fat is low.
Elderly: Older adults may have more body fat than younger adults with the same BMI.
Distribution: It does not account for where fat is stored (e.g., belly fat carries higher health risks).

Always consult with a healthcare provider for a comprehensive health assessment including waist circumference, skinfold thickness, and other metrics.

Frequently Asked Questions (FAQs)

What is a healthy BMI? +

For most adults, a BMI between 18.5 and 24.9 is considered healthy. This range is associated with the lowest risk of weight-related health issues.

Is BMI accurate for everyone? +

No. BMI is a general indicator. It may not be accurate for athletes, pregnant women, the elderly, or young children. It does not distinguish between muscle and fat.

How often should I check my BMI? +

Checking your BMI once a month is generally sufficient to track weight changes. Frequent fluctuations are normal due to water retention.

What should I do if my BMI is high? +

If your BMI falls into the overweight or obese category, consider consulting a doctor or dietitian. Small lifestyle changes in diet and exercise can significantly improve your health.

Is this tool free? +

Yes, this BMI Calculator is 100% free to use online as many times as you need.

Privacy Policy

Last Updated: 30-12-2025

Your privacy is important to us. This Privacy Policy explains how we handle information.

1. Data Collection: We do not collect, store, or transmit any personal health data you enter into the calculator. All processing is done locally on your device.

2. Cookies: We may use cookies to improve user experience. You can disable cookies in your browser settings.

3. Third-Party Ads (Google AdSense): We use third-party advertising companies to serve ads when you visit our website. These companies may use information (not including your name, address, email address, or telephone number) about your visits to this and other websites in order to provide advertisements about goods and services of interest to you.

4. Analytics: We may use tools like Google Analytics to understand traffic trends. This data is anonymous.

Terms and Conditions

By using this website, you agree to the following terms:

1. Usage: This tool is provided for personal and informational use only. It is not a medical device.

2. Liability: We are not responsible for any health decisions made based on the calculations provided by this tool. Always consult with a healthcare professional.

3. Modifications: We reserve the right to modify the service at any time.

Disclaimer

The BMI Calculator provided on this website is for estimation purposes only. It is not intended to diagnose, treat, cure, or prevent any disease. The results should not be considered as medical advice. Users should consult a qualified healthcare provider for personal health advice. We assume no liability for the accuracy of the data or the user's reliance on it.