BMI for 171 cm and 54 kg
BMI 18.5
Asia-Pacific cut-offs (23 · 25) · normal
WHO international cut-offs (25 · 30) · normal
Reference weight and healthy range
At BMI 22 the reference weight is 64.3 kg.
The healthy range (BMI 18.5–22.9) is 54.1–67 kg.
That is 0.1 kg below the bottom of the range.
Other pairs that also give BMI 18.5
Nearby heights and weights
BMI cannot tell muscle from fat, so it reads high for people who train heavily. It is a reference figure, not a diagnosis.