Body Mass Index (BMI) is a quick way to check whether your weight is in a healthy range for your height. It is widely used because it is simple, but it does not distinguish muscle from fat, so very muscular people can read as overweight. Use it as a general guide alongside other measures, not a diagnosis.
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Frequently asked questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is generally considered healthy for most adults. Below 18.5 is underweight; 25 to 29.9 is overweight; 30 or more is obese.
Is BMI accurate for everyone?
Not perfectly. It can overestimate body fat in athletes and underestimate it in older adults, and it is interpreted differently for children and some ethnic groups.