BMI for 45 kg at 180 cm tall
A person weighing 45 kg at 180 cm has a BMI of 13.9, classed as underweight. Healthy weight range for this height: 59.9–80.7 kg.
BMI 13.9 — Underweight
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Full breakdown
| BMI | 13.9 |
| Category (WHO) | Underweight |
| Healthy weight at 180 cm | 59.9 – 80.7 kg |
| Weight in pounds | 99.2 lb |
| Height in feet/inches | 5 ft 10.9 in |
Step-by-step working
- Convert height to metres: 180 cm ÷ 100 = 1.80 m
- Square the height: 1.80² = 3.2400 m²
- Divide weight by height²: 45 ÷ 3.2400 = 13.9
BMI = weight (kg) ÷ height (m)²
Try your own numbers with the BMI Calculator.