bmi calculator and body weight comparison


The bmi calculator formula for body mass index

This bmi calculator calculates body mass index from your Weight and Height and also shows how your weight compares to others of the same height and age.

Weight can  convert
lbs to kg
Height  or
Body Mass Index kg/m2
  Age:   years (  )

Body Description:

UPDATED ->   According to:

Your Weight is at compared
to others of same Height and Age

If you are at 50th percentile, you are close to the average weight.
At 90th percentile, your weight is greater than 90% of others.
At 20th percentile, then 80% of others weigh more than you.

( Compared to American's weights )


Click more information about Body Mass Index. Also see the Ideal Weight Calculator

Are you overweight?  Maybe Body Mass Index says you are, but actually you are not. BMI can be wrong. Look at the weight percentiles, because they adjust for age.

The older you get, the higher your BMI is allowed to be. For example, in people over age 50, BMI of 25 to 30 is still normal and very healthy. I also believe the 45th percentile weight is a good estimate of your ideal weight.

Also, these height and weight charts and BMI charts show what the average population is like.

Why do I have two versions of a BMI calculator on It's a leftover from year 2000, and I can't bring myself to delete old pages. So this page reminds me of the old-school html with tables, while the main BMI calculator is where new features will continue to appear.

Way back in year 2000 when I created all this BMI stuff, calculators and analysis and custom formulas, the CDC was lagging. But to their credit, the science and their webpages and calculators have become quite good. You can unfortunately still find rigid categories on CDC pages like this but, they have more useful things like a BMI percentiles calculator for children, which, reminds me to mention because it's not obvious: my Weight Percentiles calculator is VERY equivalent to a BMI percentile.

Recently I've been looking at other BMI calculators, for instance at Mayo Clinic, which disappoint me, not only because of the ads for their branded diet, but they refer to a 2013 WHO report, where various academics still lump together overweight and obesity into 'combined', which of course is less healthy than normal weight. Whenever you read a study abstract where the word "combined" is used in confusing ways, that's deliberate tricky wordsmithing.

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