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## How to Calculate BMI

What is the correct formula for working out your BMI?
I have been given different formulas, where one answer is I am over weight, theother depicting an under weight.
I am 4ft 2 inch and weigh 57kgs - I am 43years old

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###### Our expert says:
DietDoc

Dear Michelle
The formula to calculate your BMI = weight in kg divided by (height in metres x height in metres). I calculate that you are 1.27 m tall (4' 2" = 50" x 25,4), so 57/1.27 x 1.27 = 57/1.61 = 35,4 which is in the obese category. Are you sure you are only 4 ft 2 inches tall? If you were 5 ft 2 inches tall, then you BMI would equal 23,2 which is nicely in the normal category. Please measure your height with a metric tape measure and post a new message to me if your height is more than 4 ft 2 inches.
Best regards
DietDoc

The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.

2
###### Posted by: Michelle | 2011/01/24

I did make an error - I am 5ft 2 and weigh 57, my age is 43
And I worked ot my BMI and its not too bad

Reply to Michelle
###### Posted by: DietDoc | 2011/01/20

Dear Michelle
The formula to calculate your BMI = weight in kg divided by (height in metres x height in metres). I calculate that you are 1.27 m tall (4' 2" = 50" x 25,4), so 57/1.27 x 1.27 = 57/1.61 = 35,4 which is in the obese category. Are you sure you are only 4 ft 2 inches tall? If you were 5 ft 2 inches tall, then you BMI would equal 23,2 which is nicely in the normal category. Please measure your height with a metric tape measure and post a new message to me if your height is more than 4 ft 2 inches.
Best regards
DietDoc

Reply to DietDoc

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