BMI Calculation
For a person weighing 81.5 kg with a height of 171 cm (1.71 m), the BMI is 27.9 kg/m², which falls into the overweight category.
Calculation Method
- BMI is calculated as weight in kilograms divided by height in meters squared 1
- Using the formula: BMI = 81.5 kg ÷ (1.71 m)² = 81.5 ÷ 2.92 = 27.9 kg/m² 1
BMI Classification
- This BMI of 27.9 kg/m² places the individual in the overweight category (BMI 25.0-29.9 kg/m²) according to standard WHO classifications used in North and South America, Europe, sub-Saharan Africa, the Middle East, and Australia 1
- The individual has not yet reached class I obesity, which begins at BMI ≥30.0 kg/m² 1
Important Clinical Considerations
- Physical examination is needed to confirm that elevated BMI represents excess adiposity rather than increased muscularity, fluid retention, or other factors 1
- Waist circumference and waist-to-height ratio should be measured to assess central adiposity, which is a better indicator of cardiometabolic risk than BMI alone 1
- A waist-to-height ratio ≥0.5 indicates increased cardiovascular disease risk across both sexes and ethnic populations 1
Regional Variations
- These standard cutoffs apply to most populations, but lower thresholds are used in Asia-Pacific regions where health risks occur at lower BMI values 1
- In China, for example, BMI 24.0-27.9 kg/m² is classified as overweight, meaning this individual would be at the upper end of the overweight range by Chinese standards 1