BMI Calculation Result
For a person weighing 113 kilograms and measuring 164 centimeters tall, the BMI is 42.0 kg/m², which classifies as Class III obesity (severe obesity).
Calculation Method
BMI is calculated as weight in kilograms divided by height in meters squared 1, 2. Using the provided measurements:
- Weight: 113 kg
- Height: 164 cm = 1.64 meters
- BMI = 113 ÷ (1.64)² = 113 ÷ 2.69 = 42.0 kg/m²
Clinical Classification
According to World Health Organization criteria used in current guidelines 2:
- Normal weight: BMI 18.5-24.9
- Overweight: BMI 25-29.9
- Class I obesity: BMI 30-34.9
- Class II obesity: BMI 35-39.9
- Class III obesity: BMI ≥40
This BMI of 42.0 falls into Class III obesity, the highest obesity classification, which carries the most significant health risks.
Clinical Implications for Morbidity and Mortality
This BMI level is associated with substantially increased cardiovascular disease risk and all-cause mortality 1, 2. The Prospective Studies Collaboration demonstrated a 30% increase in all-cause mortality for every 5-unit increase in BMI above 25 kg/m² 1. At a BMI of 42.0, this represents a 17-unit excess above the threshold of 25, translating to markedly elevated mortality risk.
Cardiovascular event rates are significantly higher at this BMI level - in pooled cohort data, individuals with BMI 30-39.9 already showed cardiovascular event rates of 20.21 per 1000 person-years in men and 9.97 per 1000 person-years in women, compared to 13.72 and 6.37 respectively in those with normal BMI 2.
Important Clinical Caveats
While BMI is a useful screening tool, it has limitations 1:
- Does not distinguish between lean and fat mass - though at BMI 42.0, this is less of a concern than at lower BMI levels
- High specificity (95-99%) but low sensitivity (36-49%) for detecting excess adiposity 1
- Does not capture fat distribution - waist circumference should also be assessed, as visceral adiposity drives cardiometabolic risk 2
At this BMI level, assessment for weight-related comorbidities is essential, including type 2 diabetes, hypertension, obstructive sleep apnea, nonalcoholic fatty liver disease, osteoarthritis, and cardiovascular disease 2.