Body mass index
Body mass index
Save height & weight to track your BMI.
Metrics
BMI categories
Adult ranges from the WHO / CDC.
CategoryBMI range
- UnderweightBelow 18.5
- Healthy weight18.5 to 24.9
- Overweight25.0 to 29.9
About BMI
BMI = weight (kg) ÷ height (m)²
- A screening tool, not a diagnosis. It doesn’t measure body fat directly.
- Muscle counts as weight. If you lift regularly, BMI can read high even when body fat is low, track waist size or body-fat % alongside it.
- Adults only. Children, teens, pregnant people and older adults use different references.
- Watch the trend. Weigh in at the same time of day; weekly averages beat single days.