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BMI Calculator

BMI Calculator – Imperial / English

23.67

BMI Calculator – Metric

23.67

How to Calculate BMI

In pounds and inches, BMI is calculated as:
\frac{\text{Mass(lbs)}}{\text{Height (inches)}^2}\times703
In meters and kilograms, BMI is calculated as:
\frac{\text{Mass (kg)}}{\text{Height (m)}^2}

Example

Example 1:
A person has a mass of 165 lbs and is 5 foot 10 inches (70 inches) tall.
\text{BMI}=\frac{165}{70^2}\times703
\text{BMI}=\frac{165}{4900}\times703
\text{BMI}=0.3367\times703
\text{BMI}=23.67
This person’s BMI is 23.67
Example 2:
A person has a mass of 75kg and is 1m 78cm (1.78m) tall.
\text{BMI}=\frac{75}{1.78^2}
\text{BMI}=\frac{75}{3.1684}
\text{BMI}=23.67
This person’s BMI is 23.67

What is BMI?

BMI, or “Body-Mass Index” is a ratio of a person’s height to weight.
It provides a simple number to evaluate whether a person is underweight (below 18.5), ideal weight (18.5 – 25), overweight (25 – 30), or obese (above 30).

Category BMI Range
Very severely underweight less than 15.0
Severely underweight 15.0 – 16.0
Underweight 16.0 – 18.5
Healthy weight 18.5 – 25
Overweight 25.0 – 30.0
Moderately obese 30.0 – 35.0
Severely obese 35.0 – 40.0
Very severely obese more than 40.0

Challenges with BMI

BMI was initially intended to be an objective measurement of larger populations instead of individuals.
Because of its simplicity and ease to measure, it has become very common in medical and health fields to monitor BMI along with other variables.
BMI is not an absolute “score” – it is merely an indicator along with a number of other factors.
Some challenges with BMI include:
– It does not show a difference between people with lots of muscle and lots of fat – a very muscly person may have the same BMI as a person with a lot of fat.
– It does not show a difference between body types that may hold weight in different parts of their bodies
It is important to remember that BMI is an indicator, and not an absolute measurement of health.

BMI Table (pounds and inches)

50 55 60 65 70 75 80 85
60 16.87 13.94 11.72 9.98 8.61 7.5 6.59 5.84
70 19.68 16.27 13.67 11.65 10.04 8.75 7.69 6.81
80 22.5 18.59 15.62 13.31 11.48 10 8.79 7.78
90 25.31 20.92 17.58 14.98 12.91 11.25 9.89 8.76
100 28.12 23.24 19.53 16.64 14.35 12.5 10.98 9.73
110 30.93 25.56 21.48 18.3 15.78 13.75 12.08 10.7
120 33.74 27.89 23.43 19.97 17.22 15 13.18 11.68
130 36.56 30.21 25.39 21.63 18.65 16.25 14.28 12.65
140 39.37 32.54 27.34 23.29 20.09 17.5 15.38 13.62
150 42.18 34.86 29.29 24.96 21.52 18.75 16.48 14.6
160 44.99 37.18 31.24 26.62 22.96 20 17.58 15.57
170 47.8 39.51 33.2 28.29 24.39 21.25 18.67 16.54
180 50.62 41.83 35.15 29.95 25.82 22.5 19.77 17.51
190 53.43 44.16 37.1 31.61 27.26 23.75 20.87 18.49
200 56.24 46.48 39.06 33.28 28.69 25 21.97 19.46
210 59.05 48.8 41.01 34.94 30.13 26.25 23.07 20.43
220 61.86 51.13 42.96 36.61 31.56 27.5 24.17 21.41
230 64.68 53.45 44.91 38.27 33 28.74 25.26 22.38
240 67.49 55.78 46.87 39.93 34.43 29.99 26.36 23.35
250 70.3 58.1 48.82 41.6 35.87 31.24 27.46 24.33
260 73.11 60.42 50.77 43.26 37.3 32.49 28.56 25.3
270 75.92 62.75 52.73 44.93 38.74 33.74 29.66 26.27
280 78.74 65.07 54.68 46.59 40.17 34.99 30.76 27.24
290 81.55 67.4 56.63 48.25 41.61 36.24 31.85 28.22
300 84.36 69.72 58.58 49.92 43.04 37.49 32.95 29.19

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