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BMI Calculator

Calculate your Body Mass Index (BMI) using height and weight in US or metric units. See your BMI category and healthy weight range.

Quick Answer

A BMI calculator estimates body mass index using height and weight. BMI is a screening measure and does not directly measure body fat or health status.

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BMI Formula

Metric: BMI = weight (kg) / height² (m²) Imperial: BMI = (weight (lb) × 703) / height² (in²) Categories: < 18.5 Underweight 18.5 – 24.9 Normal weight 25.0 – 29.9 Overweight ≥ 30.0 Obese

How to Use This Calculator

  1. 1

    Select US/Imperial or Metric units.

  2. 2

    Enter your height (feet and inches, or centimeters).

  3. 3

    Enter your weight (pounds or kilograms).

  4. 4

    Click Calculate BMI to see your result and category.

  5. 5

    Review the healthy weight range shown in the results.

Frequently Asked Questions

BMI (Body Mass Index) is a numerical value calculated from height and weight. It is used as a general screening measure to categorize adults as underweight, normal weight, overweight, or obese.

This calculator is for general information only and is not medical advice. BMI does not directly measure body fat or health status. Consult a qualified healthcare professional for health decisions.

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Last updated: June 2026