BMI for 166 cm and 45 kg
A person 166 cm (5'5") tall weighing 45 kg (99 lbs) has a BMI of 16.3 — classified as Underweight. The healthy weight range for this height is 51.0–68.6 kg.
Your BMI
16.3
Category
Underweight
Under 18.518.5–24.925–29.930+
Healthy weight range: 51.0–68.6 kg
What does this BMI mean?
A BMI of 16.3 sits in the Underweight range under the standard WHO adult classification. This range is associated with nutritional gaps for some people. If unintentional, a check-up and dietary review are sensible.
For someone 166 cm tall, weights between 51.0 kg and 68.6 kg fall in the BMI 18.5–24.9 normal range. That's roughly 112–151 lbs.
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Last updated: 2026