BMI for 170 cm and 40 kg
A person 170 cm (5'7") tall weighing 40 kg (88 lbs) has a BMI of 13.8 — classified as Underweight. The healthy weight range for this height is 53.5–72.0 kg.
Your BMI
13.8
Category
Underweight
Under 18.518.5–24.925–29.930+
Healthy weight range: 53.5–72.0 kg
What does this BMI mean?
A BMI of 13.8 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 170 cm tall, weights between 53.5 kg and 72.0 kg fall in the BMI 18.5–24.9 normal range. That's roughly 118–159 lbs.
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Last updated: 2026