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BMI Calculator

Calculate your Body Mass Index (BMI) in metric or imperial units. See your BMI category, BMI Prime, healthy weight range for your height, and a visual gauge showing where you fall.

kg
cm

Disclaimer: BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or fat distribution. Consult a healthcare professional for a comprehensive health assessment.

Quick Facts

Normal BMI range18.5–24.9
BMI formula inventorAdolphe Quetelet (1832)
BMI measuresWeight-to-height ratio only
Asian overweight thresholdBMI 23+

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How to Use This Calculator

  1. Select your unit system: Metric (kg/cm) or Imperial (lbs/in).
  2. Enter your weight and height.
  3. Click Calculate to see your BMI, category, and healthy weight range.
  4. Review the visual gauge showing where you fall on the BMI scale.

The Formula

Metric: BMI = weight (kg) / height (m)². Imperial: BMI = 703 × weight (lbs) / height (in)². BMI Prime = BMI / 25. Healthy range: BMI 18.5–24.9.

Frequently Asked Questions

A normal BMI falls between 18.5 and 24.9. Below 18.5 is classified as underweight, 25–29.9 is overweight, 30–34.9 is obese, and 35 or above is severely obese according to WHO standards.