Body Mass Index Children US

BMI children USThis module calculates Body Mass Index for children from age 2 to age 18 and classifies the result according to the guidelines given by the U.S. Department of Health & Human Services. It also has an optional evaluation of height in relation to age.

1. Enter values for gender, height and weight.
2. The result is interpreted within four categories: Underweight (<5th percentile), Healthy weight (5th-85th percentile), Overweight (85th-95th percentile) and Obese (>95th percentile).
3. Please note, that BMI is only a very rough predictor for overweight in individuals.

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For adults, the body mass index limits for overweight and obesity are straight forward (overweight = BMI > 25 and obesity = BMI > 30). For children this is much more complicated as the limits vary a lot depending on age. This calculator uses the US guidelines that are based on fixed percentiles from a large reference population. 

A BMI of 20 indicates obesity in a 6 year old girl, whereas it would represent healthy weight for a 13 year old girl. However, as growth of children varies, the final evaluation should always be based on a several factors including physical growth, muscularity and subcutaneous fat deposits.

The calculator also includes the possibility to evaluate height in relation to age. If the child/youth scores in the high percentile range on height (above average) this could indicate that physical development is ahead of chronological age. As higher BMI is expected with increasing age (above age 6), this information can assist in a qualified evaluation of BMI.


The Centers for Disease Control and Prevention (CDC). BMI - Body Mass Index: BMI for Children and Teens.

Mei Z, Grummer-Strawn LM, Pietrobelli A, Goulding A, Goran MI, Dietz WH. Validity of body mass index compared with other body-composition screening indexes for the assessment of body fatness in children and adolescents. American Journal of Clinical Nutrition 2002;7597–985.

Hammer LD, Kraemer HC, Wilson DM, Ritter PL, Dornbusch SM. Standardized percentile curves of body-mass index for children and adolescents. American Journal of Disease of Child. 1991; 145:259–263.

Pietrobelli A, Faith MS, Allison DB, Gallagher D, Chiumello G, Heymsfield, SB. Body mass index as a measure of adiposity among children and adolescents: A validation study. Journal of Pediatrics. 1998; 132:204–210.


#586 Kelsie 2018-03-21 02:01
I am 13 turning 14 years old in a few months. I am 4'12 and weigh 80 pounds. Is that unhealthy or serious for my age.
#585 Mercedes 2018-03-18 06:20
Hi I weigh 350 pounds and I'm 5'8 and I'm only 15 years old I'm deadly fat
#584 Claudiagirl 2018-03-15 00:08
Hi. I am 5.7 feet tall I am an athlete and I am 174 pound. Should I loose weight, I have more muscle that body fat. I am 107 pounds of muscle. And I am a female
#583 Lily 2018-03-11 17:46
Hi, I am a 13 year old girl. I'm 5'1 and I weight 114. Is my weight okay? Am I fat or not?
#582 Austin 2018-03-04 02:48
Hi, Im 17 and weigh 125 pounds. Am I underweight?
#581 Carmen 2018-02-27 21:25
Hi, I'm 13 and my weight is 88 pounds and my height is4 feet 11. Am I fat?
#580 Melissa 2018-02-24 00:30
Hi I’m 15 years old my height is 5’1 and I weight at 106 pounds am I underweight?
#579 Chrissy 2018-02-21 21:12
I am 15 and I am 5'9 and I weigh 182 lbs. I am broad-shouldere d and I am skinny. Am I overweight?
#578 Jaden 2018-02-18 00:28
Im 15 years old 215 lbs and im ripped but it says im obese
#577 Peyton 2018-02-06 21:53
I am 5 foot and 130 pounds and a swimmer and this website is completely rong body mass index is a terrible way for kids to think that they are fat which is not true my body is built like a normal swimmer with a higher muscle content then people that aren’t active and this body mass index tells me that I am obese I am only 11 years old no one should have to worry about there weight at the ages these people say they are don’t trust bmi it is no reliable
#576 Lily 2018-02-01 21:09
I’m a girl 13 yr old girl who is 5’5 and 153 lbs am I over weight I don’t have a belly but the calculator says I am
#575 Aubrey Anderson 2018-01-27 18:34
I am 13 and my height is 4'8 and I weigh 110 pounds am I fat.
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