BMI of 15 — What does it mean?
Instant answer: A BMI of 15 is classified as underweight.
Unintentional weight loss into the underweight range warrants a check-up regardless of how you feel.
Weight examples that give a BMI of 15
| Height | Weight (kg) | Weight (lbs) |
|---|---|---|
| 160 cm (5'3") | 38.4 | 85 |
| 165 cm (5'5") | 40.8 | 90 |
| 170 cm (5'7") | 43.4 | 96 |
| 175 cm (5'9") | 45.9 | 101 |
| 180 cm (5'11") | 48.6 | 107 |
| 185 cm (6'1") | 51.3 | 113 |
Practical next steps
- Increase caloric intake by 300–500 kcal per day with nutrient-dense foods.
- Add resistance training 2–3 times weekly to build lean mass.
- Get bloodwork to rule out thyroid, coeliac, or absorption issues.
- Track weight monthly to confirm a steady upward trend.
Frequently asked questions
What does a BMI of 15 mean?
A BMI of 15 falls into the underweight category as defined by the World Health Organization. Unintentional weight loss into the underweight range warrants a check-up regardless of how you feel.
Is a BMI of 15 healthy?
This BMI is outside the WHO healthy range of 18.5–24.9 and falls into the underweight category.
What weight gives a BMI of 15 at 170 cm?
At 170 cm, a BMI of 15 corresponds to roughly 43.4 kg.