ELI5: bmi
// explanation
What is BMI?
BMI stands for Body Mass Index, which is a simple way to check if your body weight is healthy for your height [1][2]. Think of it like a scorecard that compares how heavy you are to how tall you are.
How do you calculate it?
Doctors use a math formula that takes your weight and divides it by your height to get a number [2][4]. The higher the number, the heavier you are compared to your height.
What do the numbers mean?
Your BMI number tells doctors if you're underweight, at a healthy weight, or overweight [2]. It's like a quick check-up that doesn't cost much money and only needs two measurements [4].
Why is it useful?
BMI helps doctors quickly figure out if someone might need to make changes to stay healthy, even though it's not a perfect measure of health [3][4].
// sources
Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.
Jun 26, 2024 ... Body mass index (BMI) is a calculated measure of weight relative to height. For adults, BMI is categorized into underweight, healthy weight,ย ...
Sep 9, 2025 ... Body mass index (BMI) is a number based on height and weight that can help estimate whether someone is at a healthy weight.
Dec 16, 2025 ... BMI is a measure of weight relative to height. BMI is a quick, low-cost, and reliable screening measure for underweight, overweight,ย ...
Dec 8, 2025 ... Obesity and overweight fact sheet from WHO providing key facts and information on causes, health consequences, double burden of disease,ย ...
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