BMI and Weight for Longevity Calculator (Adjusted for Slightly Overweight Seniors)

BMI (Body Mass Index) is a value calculated using the formula below and serves as an index for determining the degree of obesity.

BMI = Weight (kg) ÷ (Height (m) × Height (m))

Generally, BMI values are classified as follows: below 18.5 is “underweight,” 18.5 or higher but less than 25 is “normal weight,” 25 or higher but less than 30 is “obese,” and 30 or higher is “severely obese.”However, recent studies have shown that this does not necessarily apply to middle-aged and older adults, and that “being slightly overweight may lead to a longer life.” Therefore, we are conducting an evaluation that takes this into account.

References, etc.
Do “Overweight” People Live Longer Than “Underweight” People?
http://www.office-onoduka.com/nenkinblog/2010/01/post_166.html

Study on the Impact of Lifestyle Habits and Health Screening Results on Lifetime Medical Costs
http://www.pbhealth.med.tohoku.ac.jp/sites/default/files/pbhealth/goodupload/h19-21.pdf

The “longevity weight” is calculated from the standard BMI value using the formula below. While the standard BMI is generally considered to be 22, the above adjustment has been applied.

Longevity Weight (kg) = Height (m) × Height (m) × Standard BMI Value