BMI of a 5′ 1″, 100 Pound Person

What is the BMI of a man or woman who weighs 100 pounds and is 5 foot 1 inches tall?
ft
in
lbs
BMI = 18.89
Note: BMI is the same for men and women.

Am I Overweight?

Here are the BMI standards as set by the World Heath Organization:

BMICategory
< 18.5Underweight
18.5 - 25Healthy Weight
25 - 30Overweight
> 30Obese

In the United States, the average BMI for adults is 28.8.

BMI Formula

Metric
BMI = kg / m2

Imperial
BMI = (lbs * 0.45359237) / (inches * 0.0254)2

Simplified
BMI = 703 * lbs / inches2

Is BMI Worth Using?

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.

Body fat estimates for a person with a BMI of 18.89
These are rough estimates based on a formula, and do not reflect differences in muscularity, body types, etc...
Age Male Female
18 10.6% 21.4%
19 10.8% 21.6%
20 11.1% 21.9%
21 11.3% 22.1%
22 11.5% 22.3%
23 11.8% 22.6%
24 12.0% 22.8%
25 12.2% 23.0%
26 12.4% 23.2%
27 12.7% 23.5%
Age Male Female
28 12.9% 23.7%
29 13.1% 23.9%
30 13.4% 24.2%
31 13.6% 24.4%
32 13.8% 24.6%
33 14.1% 24.9%
34 14.3% 25.1%
35 14.5% 25.3%
36 14.7% 25.5%
37 15.0% 25.8%
Age Male Female
38 15.2% 26.0%
39 15.4% 26.2%
40 15.7% 26.5%
41 15.9% 26.7%
42 16.1% 26.9%
43 16.4% 27.2%
44 16.6% 27.4%
45 16.8% 27.6%
46 17.0% 27.8%
47 17.3% 28.1%
Age Male Female
48 17.5% 28.3%
49 17.7% 28.5%
50 18.0% 28.8%
51 18.2% 29.0%
52 18.4% 29.2%
53 18.7% 29.5%
54 18.9% 29.7%
55 19.1% 29.9%