BMI Calculator
Calculate your Body Mass Index from height and weight and see your BMI category. Free, private BMI calculator that runs in your browser. Fast and privacy-conscious. Data handling depends on the tool and is documented on each page.
BMI is a general screening metric and does not account for muscle mass or body composition.
Tool not working or missing something?
This tool is open-source and community-driven. If you find a bug, have a feature request, or want to contribute a new tool, please create a PR on GitHub or contact us.
Instant Browser Processing
Results appear the moment you act — no server queues, no loading spinners. All processing runs locally for zero-latency professional output.
Privacy-First by Design
Many tools process data locally in your browser. Some tools use server-side APIs or proxy requests. Check each tool page and our Privacy Policy for exact data flow details.
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BMI Calculator — Body Mass Index in Seconds
Body Mass Index is a quick screening number that relates your weight to your height. Enter your weight in kilograms and height in centimetres to get your BMI and the standard category it falls into.
How It Is Calculated
BMI = weight (kg) ÷ height (m)². For example, 70 kg at 1.75 m is 70 ÷ 3.06 ≈ 22.9, which is in the normal range. The standard categories are: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, and 30+ obese.
What BMI Does and Doesn't Tell You
BMI is a useful general indicator for populations, but it does not distinguish muscle from fat or account for body composition, age, or sex. Athletes and very muscular people may read high despite low body fat. Treat it as a starting point, not a diagnosis.
Key Features & Benefits
Every feature is designed to deliver professional results with maximum speed and minimum friction. No compromises on quality, privacy, or accessibility.
How to Use BMI Calculator — Step by Step
Follow these simple steps to get your result in under 30 seconds. No signup, no install, no learning curve — just paste, process, and download.
Enter Your Values
Type your numbers into the labelled fields in BMI Calculator. Each input is clearly described so you know exactly what to enter.
Adjust the Options
Pick the relevant settings — such as units, rates, or rounding — to match your specific situation.
Read Your Result
BMI Calculator updates the result automatically as you change inputs, so you can compare scenarios in seconds.
Copy or Share
Copy the result or share the page link. Nothing is stored, so your numbers stay private.
BMI Calculator — Frequently Asked Questions
Got questions about BMI Calculator? Here are clear, honest answers to the most common questions about pricing, privacy, compatibility, and features.
How is BMI calculated?
BMI is your weight in kilograms divided by the square of your height in metres. The calculator does this automatically from the height and weight you enter.
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is generally considered the normal range. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese.
Is BMI accurate for everyone?
BMI is a general screening tool. It does not separate muscle from fat, so athletes may read high, and it does not account for age, sex, or body composition.
Is my health data kept private?
Yes. The BMI calculation runs entirely in your browser; your height and weight are never uploaded or stored.
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