What is BMI Calculator?

It is a free online tool designed to help you with calculate body mass index and ideal weight category. You can use it directly in your browser without any installation.

Is BMI Calculator completely free to use?

Yes, BMI Calculator is 100% free to use. There are no hidden fees, no subscriptions, and no signup required.

Does it work on mobile devices?

Absolutely! Our tool is fully responsive and works seamlessly on all devices including smartphones, tablets, and desktop computers.

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Body Metrics Calculator

Advanced health calculator suite. Calculate your Body Mass Index (BMI), Body Fat Percentage, Ideal Weight, and Daily Calories (TDEE).

Your Current BMI

Male

Female

Metric

Imperial

Basic Information

Age (years)

Height (cm)

Weight (kg)

BMI Analysis

Enter your height and weight above to see your BMI analysis.

Recent History

No history saved yet.

WHO BMI Classification

Underweight< 18.5

Normal18.5 - 24.9

Overweight25.0 - 29.9

Obese Class I30.0 - 34.9

Obese Class II35.0 - 39.9

Obese Class III≥ 40.0

Disclaimer: BMI is a useful screening tool for populations but has limitations for individuals. It does not measure body fat directly and may overestimate adiposity in muscular individuals or underestimate it in older adults experiencing muscle loss. Consult a healthcare professional for accurate medical advice.

Read our guide on understanding BMI and health metrics

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How to use BMI Calculator (Body Mass Index)

Select your preferred measurement unit (Metric: cm/kg or Imperial: ft/lbs).

Enter your exact Height and Weight.

The tool instantly calculates your BMI score and categorizes it (Underweight, Normal, Overweight, Obese).

Why use our BMI Calculator (Body Mass Index)?

WHO Standard Categories

Uses the official World Health Organization (WHO) BMI classifications to give you accurate health baseline data.

Ideal Weight Range

Based on your height, the tool tells you exactly how many kilograms you need to gain or lose to reach the 'Normal' BMI category.

100% Secure & Private

All processing happens in your browser. Your files are never uploaded to our servers, guaranteeing absolute privacy and security.

Lightning Fast

Because everything runs locally on your device, processing is instant. No waiting in queues or dealing with slow uploads.

Frequently Asked Questions

What is the formula for calculating BMI?

The formula is simple: BMI = Weight in kg / (Height in meters squared). For imperial units, it is: [Weight in lbs / (Height in inches squared)] × 703.

Is BMI an accurate measure of health?

BMI is a good general screening tool for populations, but it has flaws for individuals. It does not distinguish between muscle mass and fat mass. A highly muscular athlete might be classified as 'Obese' despite having low body fat.