What is the body mass index (BMI) for a person who is 165 cm tall and weighs 84 kg?

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BMI Calculation and Classification

For a person who is 165 cm tall and weighs 84 kg, the BMI is 30.8 kg/m², which classifies this individual as having Class I obesity and places them at significantly increased risk for cardiovascular disease, type 2 diabetes, and all-cause mortality. 1

BMI Calculation

The BMI is calculated as weight in kilograms divided by height in meters squared 1:

  • Weight: 84 kg
  • Height: 165 cm = 1.65 meters
  • BMI = 84 ÷ (1.65)² = 84 ÷ 2.72 = 30.8 kg/m²

Clinical Classification and Risk Assessment

This BMI of 30.8 kg/m² falls into the Class I obesity category (BMI 30-34.9 kg/m²), which is associated with substantially elevated health risks 1:

  • Obesity is defined as BMI ≥30 kg/m² and represents an independent risk factor for cardiovascular disease, not just a marker of other risk factors 1

  • The greater the BMI above 25 kg/m², the greater the risk of cardiovascular disease, type 2 diabetes, and all-cause mortality 1

  • Individuals with obesity (BMI 30-39.9) have 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 per 1000 person-years respectively in those with normal BMI 1

Additional Assessment Needed

Waist circumference should be measured as an additional risk stratification tool, as central adiposity increases cardiovascular and metabolic disease risk independent of BMI 1:

  • Men with waist circumference >102 cm (>40 inches) and women with waist circumference >88 cm (>35 inches) are at increased risk for cardiovascular disease 1

Treatment Implications

At this BMI of 30.8 kg/m², this individual requires active obesity treatment as a chronic disease 1:

  • A comprehensive lifestyle intervention for at least 6-12 months is essential, including calorie reduction (500-1000 kcal/day deficit for Class I obesity), increased physical activity, and behavioral modification strategies 1

  • Even modest weight loss of 3-5% produces clinically meaningful health benefits, including reductions in triglycerides, blood glucose, and risk of developing type 2 diabetes 1

  • Greater weight loss of 5-10% improves blood pressure by approximately 3 mm Hg in those with hypertension and may decrease hemoglobin A1c by 0.6-1% in those with type 2 diabetes 1

  • Pharmacological weight reduction should be considered as an adjunct to lifestyle interventions for adults with BMI ≥30 kg/m² when lifestyle interventions alone do not achieve sufficient weight loss 1

References

1
Guideline

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Dr.Oracle Medical Advisory Board & Editors, 2025

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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