BMI 31.8
Is a BMI of 31.8 normal?
A BMI of 31.8 is classified here as Obesity. 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 31.8 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 | 92% | 0% | 8% |
| Women | 93% | 0% | 7% |
BMI 31.8 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 | 90% | 0% | 10% |
| Under 18 | Women | 91% | 0% | 9% |
| 18–30 | Men | 92% | 0% | 8% |
| 18–30 | Women | 94% | 0% | 6% |
| 31–40 | Men | 93% | 0% | 7% |
| 31–40 | Women | 93% | 0% | 7% |
| 41–50 | Men | 93% | 0% | 7% |
| 41–50 | Women | 91% | 0% | 9% |
| 51–65 | Men | 91% | 0% | 9% |
| 51–65 | Women | 89% | 0% | 11% |
| 66+ | Men | 93% | 0% | 7% |
| 66+ | Women | 88% | 0% | 12% |
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.