How BMI Is Calculated: Body Mass Index Formula & Health Ranges
Last updated: 2026-09-11 • Editorial Staff
Body Mass Index (BMI) is an international screening metric used to categorize adult weight relative to height.
BMI Metric Formula
BMI = Weight (kg) ÷ [Height (meters)]²
Underweight: < 18.5 | Normal Weight: 18.5 – 24.9 | Overweight: 25.0 – 29.9 | Obesity: ≥ 30.0
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