Body fat percentage and BMI (body mass index) are two ways of judging a person’s fatness from different perspectives, and they differ in terms of definition, calculation methods, normal standards and criteria for judging fatness and thinness. Body fat percentage and BMI are just an objective data that can be used as a reference opinion, but it is recommended not to pay too much attention to the value changes. A person’s health is related to many factors and cannot be judged by weight and fat alone, but also in conjunction with their own situation.1. Definition: Body fat percentage is the ratio of body fat to total body weight; BMI is a reference indicator that uses the ratio of height and weight to reflect fatness; 2. Calculation method: Body fat percentage = fat weight/weight x 100%. BMI (body mass index) = weight (kg)/height (m) squared; 3, normal standards: normal body fat rate standards for men and women are different, normal adult body fat rate, 12%-23% for men and 16%-27% for women, some special occupational groups, such as athletes have different body fat rate standards than ordinary people. Relatively speaking, BMI applies to most normal people, according to the Chinese standard 18.5-23.9 is normal; 4, the judgment of fat and thin mark: body fat rate is too high, weight more than 20% of the normal value is considered obese. 24.0-27.9 BMI value is overweight, BMI ≥ 28.0 is obese; 5, the meaning is different: body fat rate higher than the normal standard generally represents insufficient exercise, excess nutrition Or have endocrine system disease, when the male body fat rate is lower than 5%, female body fat rate is lower than 13%, may cause body dysfunction. when BMI is higher than the standard body mass index, it represents the probability of obesity-related diseases increase, such as hypertension, hyperlipidemia, diabetes, etc.