BMI 18.0
Is a BMI of 18.0 normal?
A BMI of 18.0 is classified here as Underweight. BMI is a screening measure based on height and weight; it does not diagnose health on its own. A clinician can help interpret it alongside age, body composition, medical history, and other factors.
How does a BMI of 18.0 compare by gender?
These percentages are calculated from anonymous BMI results collected by this calculator. “Similar” means the same one-decimal BMI value.
| Group | Lower BMI | Similar BMI | Higher BMI |
|---|---|---|---|
| Men | 7% | 5% | 89% |
| Women | 18% | 12% | 71% |
BMI 18.0 by age group
The table below uses the same anonymous data, segmented by reported age and gender. “Similar” means the same one-decimal BMI value.
| Age group | Group | Lower BMI | Similar BMI | Higher BMI |
|---|---|---|---|---|
| Under 18 | Men | 21% | 9% | 69% |
| Under 18 | Women | 34% | 14% | 53% |
| 18–30 | Men | 5% | 5% | 90% |
| 18–30 | Women | 17% | 14% | 69% |
| 31–40 | Men | 2% | 2% | 96% |
| 31–40 | Women | 7% | 8% | 85% |
| 41–50 | Men | 2% | 1% | 97% |
| 41–50 | Women | 6% | 4% | 90% |
| 51–65 | Men | 3% | 2% | 95% |
| 51–65 | Women | 6% | 4% | 90% |
| 66+ | Men | 7% | 3% | 90% |
| 66+ | Women | 10% | 4% | 85% |
Category ranges: 15 or less Starvation; 15.1–17.4 Anorexic; 17.5–18.4 Underweight; 18.5–24.9 Ideal; 25–29.9 Overweight; 30–39.9 Obesity; 40 or greater Morbidly Obese.