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BMI Guide

BMI (Body Mass Index) is a number calculated by dividing weight in kilograms by height in meters squared. It is currently the international standard for measuring body weight status.

BMI Formula

  • Metric: BMI = Weight(kg) / Height(m)²
  • Imperial: BMI = Weight(lb) / Height(in)² × 703

BMI Classifications

Adult BMI Standards (Age 18+):

  • Underweight: BMI ≤ 18.5
  • Normal Weight: BMI 18.5-24.9
  • Overweight: BMI 25.0-29.9
  • Obese: BMI ≥ 30.0

Children and Teen BMI Standards (Ages 7-17):

Gender Age Overweight Obese
Female717.2-18.9≥18.9
818.1-19.9≥19.9
919.0-21.0≥21.0
1020.0-22.1≥22.1
1121.1-23.3≥23.3
1221.9-24.5≥24.5
1322.6-25.6≥25.6
1423.0-26.3≥26.3
1523.4-26.9≥26.9
1623.7-27.4≥27.4
1723.8-27.7≥27.7
Male717.4-19.2≥19.2
818.1-20.3≥20.3
918.9-21.4≥21.4
1019.6-22.5≥22.5
1120.3-23.6≥23.6
1221.0-24.7≥24.7
1321.9-25.7≥25.7
1422.6-26.4≥26.4
1523.1-26.9≥26.9
1623.5-27.4≥27.4
1723.8-27.8≥27.8

Gender Differences:

BMI standards differ slightly between males and females:

Males:
  • Ideal BMI: 20-25
  • Body Fat Reference: 14-17%
Females:
  • Ideal BMI: 19-24
  • Body Fat Reference: 21-24%

Age Factors:

BMI standards adjust with age:

  • Ages 19-24: Lower ideal BMI range
  • Ages 25-34: Slightly higher acceptable range
  • Ages 35-44: Moderately relaxed standards
  • Ages 45-54: Further increased acceptable BMI range
  • Ages 55+: More flexible standards, considering overall health

Note: BMI values are for reference only and should be evaluated alongside age, gender, body type, muscle mass, and other factors. Consult healthcare professionals for personalized advice.