Here are the BMI standards as set by the World Heath Organization:
| BMI | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 - 25 | Healthy Weight |
| 25 - 30 | Overweight |
| > 30 | Obese |
In the United States, the average BMI for adults is 28.8.
Metric
BMI = kg / m2
Imperial
BMI = (lbs * 0.45359237) / (inches * 0.0254)2
Simplified
BMI = 703 * lbs / inches2
Body Mass Index is a very simplistic method of determining whether a person is overweight. It does not taken into account a person's frame, gender, or muscularity. Furthermore, at least one study has suggested that slightly overweight people may live longer than people in the "normal" range.
Nevertheless, BMI is highly correlated with body fat % and is a decent enough yardstick of a healthy weight.
| Age | Male | Female |
|---|---|---|
| 18 | 12.5% | 23.3% |
| 19 | 12.7% | 23.5% |
| 20 | 13.0% | 23.8% |
| 21 | 13.2% | 24.0% |
| 22 | 13.4% | 24.2% |
| 23 | 13.7% | 24.5% |
| 24 | 13.9% | 24.7% |
| 25 | 14.1% | 24.9% |
| 26 | 14.4% | 25.2% |
| 27 | 14.6% | 25.4% |
| 28 | 14.8% | 25.6% |
| 29 | 15.0% | 25.8% |
| 30 | 15.3% | 26.1% |
| Age | Male | Female |
|---|---|---|
| 31 | 15.5% | 26.3% |
| 32 | 15.7% | 26.5% |
| 33 | 16.0% | 26.8% |
| 34 | 16.2% | 27.0% |
| 35 | 16.4% | 27.2% |
| 36 | 16.7% | 27.5% |
| 37 | 16.9% | 27.7% |
| 38 | 17.1% | 27.9% |
| 39 | 17.3% | 28.1% |
| 40 | 17.6% | 28.4% |
| 41 | 17.8% | 28.6% |
| 42 | 18.0% | 28.8% |
| 43 | 18.3% | 29.1% |
| Age | Male | Female |
|---|---|---|
| 44 | 18.5% | 29.3% |
| 45 | 18.7% | 29.5% |
| 46 | 19.0% | 29.8% |
| 47 | 19.2% | 30.0% |
| 48 | 19.4% | 30.2% |
| 49 | 19.6% | 30.4% |
| 50 | 19.9% | 30.7% |
| 51 | 20.1% | 30.9% |
| 52 | 20.3% | 31.1% |
| 53 | 20.6% | 31.4% |
| 54 | 20.8% | 31.6% |
| 55 | 21.0% | 31.8% |