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 | 25.4% | 36.2% |
| 19 | 25.6% | 36.4% |
| 20 | 25.8% | 36.6% |
| 21 | 26.1% | 36.9% |
| 22 | 26.3% | 37.1% |
| 23 | 26.5% | 37.3% |
| 24 | 26.7% | 37.5% |
| 25 | 27.0% | 37.8% |
| 26 | 27.2% | 38.0% |
| 27 | 27.4% | 38.2% |
| 28 | 27.7% | 38.5% |
| 29 | 27.9% | 38.7% |
| 30 | 28.1% | 38.9% |
| Age | Male | Female |
|---|---|---|
| 31 | 28.4% | 39.2% |
| 32 | 28.6% | 39.4% |
| 33 | 28.8% | 39.6% |
| 34 | 29.0% | 39.8% |
| 35 | 29.3% | 40.1% |
| 36 | 29.5% | 40.3% |
| 37 | 29.7% | 40.5% |
| 38 | 30.0% | 40.8% |
| 39 | 30.2% | 41.0% |
| 40 | 30.4% | 41.2% |
| 41 | 30.7% | 41.5% |
| 42 | 30.9% | 41.7% |
| 43 | 31.1% | 41.9% |
| Age | Male | Female |
|---|---|---|
| 44 | 31.3% | 42.1% |
| 45 | 31.6% | 42.4% |
| 46 | 31.8% | 42.6% |
| 47 | 32.0% | 42.8% |
| 48 | 32.3% | 43.1% |
| 49 | 32.5% | 43.3% |
| 50 | 32.7% | 43.5% |
| 51 | 33.0% | 43.8% |
| 52 | 33.2% | 44.0% |
| 53 | 33.4% | 44.2% |
| 54 | 33.6% | 44.4% |
| 55 | 33.9% | 44.7% |