BMI of a 6′ 4″, 173 Pound Person

What is the BMI of a man or woman who weighs 173 pounds and is 6 foot 4 inches tall?
Height
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Weight
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For a 6′ 4″ tall person who weighs 173 lbs:
BMI = 21.06
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 21.06
These are rough estimates based on a formula, and do not reflect differences in muscularity, body types, etc...
Age Male Female
18 13.2% 24.0%
19 13.4% 24.2%
20 13.7% 24.5%
21 13.9% 24.7%
22 14.1% 24.9%
23 14.4% 25.2%
24 14.6% 25.4%
25 14.8% 25.6%
26 15.1% 25.9%
27 15.3% 26.1%
28 15.5% 26.3%
29 15.7% 26.5%
30 16.0% 26.8%
Age Male Female
31 16.2% 27.0%
32 16.4% 27.2%
33 16.7% 27.5%
34 16.9% 27.7%
35 17.1% 27.9%
36 17.4% 28.2%
37 17.6% 28.4%
38 17.8% 28.6%
39 18.0% 28.8%
40 18.3% 29.1%
41 18.5% 29.3%
42 18.7% 29.5%
43 19.0% 29.8%
Age Male Female
44 19.2% 30.0%
45 19.4% 30.2%
46 19.7% 30.5%
47 19.9% 30.7%
48 20.1% 30.9%
49 20.3% 31.1%
50 20.6% 31.4%
51 20.8% 31.6%
52 21.0% 31.8%
53 21.3% 32.1%
54 21.5% 32.3%
55 21.7% 32.5%