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BMI for 173 cm and 45 kg

A person 173 cm (5'8") tall weighing 45 kg (99 lbs) has a BMI of 15.0 — classified as Underweight. The healthy weight range for this height is 55.4–74.5 kg.

Your BMI
15.0
Category
Underweight
Under 18.518.5–24.925–29.930+
Healthy weight range: 55.4–74.5 kg

What does this BMI mean?

A BMI of 15.0 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 173 cm tall, weights between 55.4 kg and 74.5 kg fall in the BMI 18.5–24.9 normal range. That's roughly 122–164 lbs.

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Nearby BMI combinations

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174 cm · 45 kg
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173 cm · 55 kg
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175 cm · 50 kg
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Related

45 kg → lbs173 cm → feet & inchesFull BMI CalculatorCalorie / TDEE Calculator

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Last updated: 2026