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.


#772 Lizzie 2018-11-16 22:58
I'm 12 and 5' 1" in height, 50 pounds and 8 stone in weight. It says here that I'm underweight, when I'm obviously super fat. I mean, come on, if you saw me compared to my friends, I wish I was skinny like them, I wish I could be perfect like everyone else
#771 riley estrada 2018-11-16 00:12
im 11 turning 12 in 12 days and im 60 inches tell and im 122 pounds ,am I overweight
#770 unknown 2018-11-11 03:47
Im 12.5/female/5'3 " and I weigh 163 pounds. but i have a big butt and big thighs, and my stomach is not big. it says im obese.
#769 Elisabeth 2018-11-07 00:34
I’m 11 years old and 5’2 and I weigh 76 lbs, which is 1 percentile....

It says I’m underweight.
#768 Amber 2018-11-05 20:19
I am 14 and I weigh 145 lbs and the doctors say I'm not overweight and yet on here it says I am overweight I am confuzzled!!!!! !!
#767 Job 2018-11-04 02:58
I'm in the 1st percentile
#766 Ava 2018-11-04 00:12
Quoting Maddie:
I’m 11 I’m 5”6 and 126 pounds and it says I’m at a healthy weight yet I look fat. Am I overweight? I legitimately confused

The thing is, this website could be completely wrong. Your weight could be unhealthy looking at it from a basic view but overall, you could be completely healthy. Me, for example, I weigh 114 and this thing says I’m overweight yet I literally went to the doctor the day before and she said “yep, your fine!” You could look fat but be healthy. I don’t know where I’m going with this. I guess what I’m trying to say is that even if you look fat, it doesn’t mean you are unhealthy.
#765 Ava 2018-11-04 00:01
See, I’m 13 and a half years old, five feet and a half inch in height, and I weighed 114. My doctor said it was completely healthy and I have lost a lot of weight. I don’t wanna lose too much weight because this meter says so. I’m also especially careful because I may not grow anymore. Should I be really worried?
#764 Skye 2018-11-01 04:49
Hi! I'm Skye I'm between 4'8 and 4'9. I am twelve years old and weigh 80 pounds. Is that under weight or Normal?
#763 Rachel 2018-10-26 12:41
Hey, I’m rach I am 14 and I’m 5’4 I weigh 135 am I overweight
#762 Maddie 2018-10-24 02:05
I’m 11 I’m 5”6 and 126 pounds and it says I’m at a healthy weight yet I look fat. Am I overweight? I legitimately confused
#761 Keith 2018-10-22 06:13
Hey I turned 15 in September and I weigh 144 lbs am I overweight because I look at my stomach and it’s flat. What should I do since I play soccer like 3x a week for like an hour
#760 bella 2018-10-22 02:52
Hi i'm 13 125 lbs and 5'1 but i workout and i have a flat stomach. Am I overweight?
#759 Ember 2018-10-21 22:36
I’m about to turn 15 and I am 5’2 and 92 lbs. Is this healthy? I don’t really exercise much, and my friends are always telling me I need to
#758 Ryan Ellis 2018-10-18 02:39
Hi, I am 13 years old, 223 lbs and 6'1''. Am I overweight or obese?
#757 Tayla 2018-10-16 15:00
Quoting Tiffany Collins:
Quoting Barbara Bayona:
This is why kids have such an unhealthy look at themselves. It really depends on the child and on the circumstances. The cdc really needs to update their website. Too many young kids are hurting themselves because they looking at numbers!

Very true

Very true. But it’s hard not to believe you are fat when even your family tells you that you are fat.
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