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BMI Calculator - Free Online Body Mass Index & Weight Evaluation

Calculate your Body Mass Index (BMI), ideal weight range, and health category based on metric or imperial height and weight.

This tool runs in your browser.
Your result will appear here.

How to use

  1. 01Select metric (cm/kg) or imperial (ft/lbs) measurement units.
  2. 02Input your height and weight to calculate your Body Mass Index (BMI).
  3. 03Review your BMI health category and see your recommended ideal weight range.

FAQ

What is BMI and what formula does it use?

Body Mass Index (BMI) is calculated as weight in kilograms divided by height in meters squared (kg/m²), serving as a widely used screening metric for weight categories.

What are the standard WHO BMI classifications for adults?

Under WHO criteria: below 18.5 is underweight, 18.5–24.9 is normal weight, 25.0–29.9 is overweight, and 30.0 or higher falls into the obesity category.

Are BMI calculations accurate for athletes and bodybuilders?

BMI does not directly distinguish between muscle mass and fat tissue. Athletes with high muscle mass may register as overweight despite low body fat.