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 | 13.8% | 24.6% |
| 19 | 14.0% | 24.8% |
| 20 | 14.3% | 25.1% |
| 21 | 14.5% | 25.3% |
| 22 | 14.7% | 25.5% |
| 23 | 15.0% | 25.8% |
| 24 | 15.2% | 26.0% |
| 25 | 15.4% | 26.2% |
| 26 | 15.7% | 26.5% |
| 27 | 15.9% | 26.7% |
| 28 | 16.1% | 26.9% |
| 29 | 16.3% | 27.1% |
| 30 | 16.6% | 27.4% |
| Age | Male | Female |
|---|---|---|
| 31 | 16.8% | 27.6% |
| 32 | 17.0% | 27.8% |
| 33 | 17.3% | 28.1% |
| 34 | 17.5% | 28.3% |
| 35 | 17.7% | 28.5% |
| 36 | 18.0% | 28.8% |
| 37 | 18.2% | 29.0% |
| 38 | 18.4% | 29.2% |
| 39 | 18.6% | 29.4% |
| 40 | 18.9% | 29.7% |
| 41 | 19.1% | 29.9% |
| 42 | 19.3% | 30.1% |
| 43 | 19.6% | 30.4% |
| Age | Male | Female |
|---|---|---|
| 44 | 19.8% | 30.6% |
| 45 | 20.0% | 30.8% |
| 46 | 20.3% | 31.1% |
| 47 | 20.5% | 31.3% |
| 48 | 20.7% | 31.5% |
| 49 | 20.9% | 31.7% |
| 50 | 21.2% | 32.0% |
| 51 | 21.4% | 32.2% |
| 52 | 21.6% | 32.4% |
| 53 | 21.9% | 32.7% |
| 54 | 22.1% | 32.9% |
| 55 | 22.3% | 33.1% |