by Dr.Jirapuck Warinpramote
Understanding BMI: Body Mass Index (BMI) is a screening tool that can help you detect obesity and related health risks early. At Wellmed Bangkok Clinic, we aim to improve your overall health and wellness using BMI as one of the health indicators. This article covers what BMI is, how it’s calculated, what BMI categorise are, and a helpful tool to help you calculate your BMI.
What Is BMI?
BMI, or Body Mass Index, provides an estimate of body fat based on weight and height. It’s a quick, convenient way to determine if you are underweight, normal weight, overweight, or obese. Having too much body fat increases risks of heart disease, high blood pressure, and type 2 diabetes.
How Is BMI Calculated?
Calculating BMI is straightforward. You only need your weight in kilograms (kg) and your height in meters (m). The formula is:
BMI =
You can also calculate BMI with these steps;
- Divide your weight by your height
- Divide that answer by your height again
For example, a person who weight 86 kg and is 1.7 m tall would calculate their BMI in the following way:
Their BMI would be 29.7577 (Overweight)
What are the BMI Categories?
According to the World Health Organization (WHO), obesity is “excess or abnormal fat accumulation that presents a risk to health.” BMI is commonly used to screen most people for obesity and related health risks. BMI cutoffs vary by ethnicity due to differences in body fat distribution. With the same BMI, people of Asia descent tend to have more abdominal fat at lower BMI compared to White, Hispanic, or Black individuals.
| Ethnic Group | BMI (kg/m²) | Classification | Ethnic Group | BMI (kg/m²) | Classification |
| White, Hispanic, Black | 30 or more | Obese | Asian | 25 or more | Obese |
| 25 to 29.9 | Overweight | 23 to 24.9 | Overweight | ||
| 18.5 to 24.9 | Normal weight | 18.5 to 22.9 | Normal weight | ||
| Less than 18.5 | Underweight | Less than 18.5 | Underweight |
BMI may underestimate body fat for older adults or those with low muscle mass while it may overestimate body fat for muscular individuals. Another way to determine your health risk due to excess body fat is to measure your waist circumference.
What Is Your BMI?
To check your BMI and understand your weight category, use our convenient BMI calculator at https://wellmedbangkok.com/bmi-calculator/. If you have questions about your BMI, talk to your healthcare provider about your weight.
About WellMed Bangkok Clinic
WellMed Bangkok Clinic is a trusted medical provider located in central Bangkok, known for delivering accessible, high-quality healthcare to both Thai and expatriate communities. We specialize in general practitioner services, chronic disease care, and convenient blood testing both in-clinic and at home.
Recognized as Bangkok’s #1 clinic for weight loss and treatment, WellMed is widely respected for its discreet, non-judgmental approach and commitment to weight loss and health education. With a focus on privacy, accuracy, and patient support, we help individuals make informed decisions about their health while ensuring effective treatment and care.
Frequently Asked Questions (FAQ) About BMI
Q1: What exactly is BMI?
A: BMI (Body Mass Index) is a simple calculation using your weight and height to provide a rough estimate of your body fatness. It helps categorize your weight as underweight, normal, overweight, or obese.
Q2: How do I calculate my BMI?
A: BMI is calculated by dividing your weight in kilograms by your height in meters squared. For example, if you weigh 70 kg and are 1.7 meters tall, divide 70 by (1.7 x 1.7) = 24.22.
Q3: What are the BMI ranges for different weight categories?
A: According to WHO standards, underweight is below 18.5, normal weight is 18.5 to 24.9, overweight is 25 to 29.9, and obesity is 30 or more. Note that Asian populations have slightly different cutoff points due to variations in fat distribution.
Q4: Does BMI directly measure body fat?
A: No. BMI is an indirect measure. It estimates body fat based on height and weight but does not differentiate between muscle and fat mass.
Q5: Can a high BMI be healthy?
A: It depends. Some people, such as athletes, have high muscle mass, which can raise BMI but not increase health risks. Always consider other factors like waist circumference and lifestyle.
Q6: Why are BMI cutoffs different for Asians?
A: Research shows Asians tend to have more abdominal fat at lower BMIs compared to other ethnic groups, increasing their risk of health problems. Hence, the overweight cutoff for Asians starts at 23, and obesity starts at 25.
Q7: How reliable is BMI for assessing health?
A: BMI is a useful screening tool for populations but has limitations for individuals. Factors such as age, muscle mass, and fat distribution affect its accuracy. For a full health assessment, additional measurements and clinical evaluation are needed.
Q8: How can Wellmed Bangkok Clinic help me understand my BMI?
A: Our team offers personalized consultations with BMI calculation, body composition analysis, and advice tailored to your lifestyle and health needs.
Q9: Where can I calculate my BMI easily?
A: Use the free BMI calculator on Wellmed Bangkok Clinic’s website at https://wellmedbangkok.com/bmi-calculator/ to quickly find your BMI and interpret your results.
