BMI Chart & Categories
These BMI ranges are commonly used for adults. BMI is a screening tool — not a diagnosis — and it doesn’t directly measure body fat.
BMI categories
Adult ranges (general guidance)
Visual guide (BMI scale)
Underweight
Normal
Overweight
Obesity
< 18.5
18.5–24.9
25.0–29.9
≥ 30.0
BMI is a quick screening tool. For best context, consider waist size and overall fitness too.
| Category | BMI range | Notes |
|---|---|---|
| Underweight | < 18.5 | Can reflect low muscle mass, illness, or inadequate nutrition. Context matters. |
| Normal weight | 18.5 – 24.9 | Generally associated with lower risk on average, but not a guarantee of health. |
| Overweight | 25.0 – 29.9 | BMI does not measure fat distribution. Waist size and fitness level can change risk a lot. |
| Obesity | ≥ 30.0 | Associated with higher risk on average; not a diagnosis. Consider other measures and medical context. |
Tip: BMI can be misleading for very muscular people or those with low muscle mass. For a fuller picture, consider waist size, fitness level, and medical context.
FAQ
Quick answers to common BMI questions.
QIs BMI accurate?
BMI can be useful as a quick screening measure, but it can misclassify people with high muscle mass, low muscle mass, or unusual body composition. It’s best used alongside other measures.
QDoes BMI apply to children?
Child BMI is interpreted differently (age- and sex-specific percentiles). Adult BMI ranges should not be used for children without proper context.
QWhat should I use in addition to BMI?
Waist circumference, waist-to-height ratio, fitness level, blood pressure, and lab results often provide a more complete picture than BMI alone.
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