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Compute Body Mass Index from height and weight instantly with WHO four-tier category and metric/imperial unit toggle.

📘 How to Use

  1. Enter your height (ft·in or cm) and weight (lbs or kg).
  2. View your BMI value and evaluation result as you type.
  3. Check your evaluation category and use it as a reference for health management.

BMI Calculator

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Calculate Your BMI

💡 About This Tool

Track your Body Mass Index (BMI) instantly to monitor fitness goals, health trends, or medical checkup results. This tool provides a quick snapshot of your weight category based on your height and weight.

📘 How to Use

  • Input Your Stats: Enter your height and weight in US units (ft·in / lbs) — the default — or use the unit toggle to switch to metric (cm / kg).
  • Get Results: Your BMI score and weight classification appear instantly as you type.
  • Unit Toggle: Each unit system keeps its own inputs — switch back and your stats and result reappear as entered.

🧐 Frequently Asked Questions

What is a healthy BMI?

The World Health Organization (WHO) defines a healthy BMI as being between 18.5 and 24.9. Scores of 25.0 or higher are classified as overweight.

Is BMI accurate for athletes?

Because BMI only uses total weight and height, it does not distinguish between muscle and fat. Muscular athletes may be classified as "Overweight" despite having low body fat. Use this tool as a general health reference rather than a definitive medical diagnosis.

📚 Did You Know?

Belgian mathematician Adolphe Quetelet developed this formula in the 1830s. Known then as the Quetelet Index, it has served as a global health benchmark for nearly 200 years.