Health & Fitness5 min read•August 4, 2026
Understanding BMI: How Body Mass Index Categorizes Health & Ideal Target Weight
Learn how Body Mass Index (BMI) is calculated for adults, understand World Health Organization (WHO) weight categories, and find your healthy weight range.
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Reviewed by the GreenCode Health & Fitness Editorial Desk
Last Updated: August 4, 2026
Disclaimer: Calculations and results provided by this tool are mathematical estimates for informational and educational purposes only. They do not constitute professional financial, tax, or legal advice.
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Open Tool Now →BMI Calculator
Introduction
Body Mass Index (BMI) is a universal screening metric used by medical professionals to classify weight relative to height into Underweight, Normal weight, Overweight, and Obese categories.
Step-by-Step Instructions
- Select Metric (kg/cm) or Imperial (lbs/ft-in) units.
- Input your current Body Weight.
- Input your exact Height.
- Click Calculate to get your numerical BMI score and health classification.
- Review your calculated healthy weight target range.
Key Use Cases
- Fitness Tracking: Monitor weight loss or muscle gain progress.
- Health Risk Assessment: Evaluate weight category against medical guidelines.
- Ideal Weight Target: Calculate target weight required to achieve a normal 18.5 - 24.9 BMI score.
Frequently Asked Questions
What is considered a healthy adult BMI range?
According to the WHO, a normal BMI score ranges between 18.5 and 24.9 kg/m² for adults.
Does BMI differentiate between muscle mass and fat?
No, BMI is a statistical height-to-weight estimate. Athletes with high muscle mass may record elevated BMI scores despite low body fat.