What does a BMI of 20.6 mean at 5'4"?
According to the WHO/NHS standard BMI classification, a Body Mass Index of 20.6 is in the Normal weight band. At a height of 5'4" (about 163 cm), the official healthy weight range is 48.9–65.8 kg (107.8–145.1 lbs, or roughly 7 st 10 lb to 10 st 5 lb).
A weight of 120 lbs (54.4 kg) is within the healthy NHS-recommended weight range.
You are at the lowest statistical risk of weight-related health conditions such as type 2 diabetes, heart disease, and high blood pressure. Aim to maintain weight stability through balanced eating and regular activity.
Key facts
- BMI is a screening tool, not a diagnosis. It works well for most adults but does not distinguish between muscle and fat.
- If you are very muscular or athletic, your BMI may overestimate body fat. Pair this result with a body fat percentage check.
- For South Asian, Chinese, or Black ethnic groups, NICE recommends lower thresholds (overweight at BMI 23, obese at BMI 27.5).
- For pregnancy, use our pregnancy BMI calculator with pre-pregnancy weight instead.
- For children and teens, use the child BMI calculator with age-and-sex percentile bands.