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.


#877 Mari 2019-02-21 06:27
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#876 Brooke 2019-02-21 01:20
I’m 10 years old and weight 130lbs. I need tips on how to lose some weight. I’m faster than the boys in my class. If you are 13 and are reading this, you are not fat.
#875 sara 2019-02-20 14:23
i’m 13, 128 pounds.. i feel so fat bc other girls my age are just hitting the 100 mark :/
#874 Scarlett Fairow 2019-02-20 07:42
Hello, Julia!
I wanted to let you know that you are not in any means overweight, or obese taking in consideration your height, age, and weight. Although, according to U.S. Guidelines for body mass index, you are over average weight for your age. Which again, is not overweight, but being 100% is severely obese, and 50% average, you are at 54%. So, prior to what I said, you are over average weight for a girl your age, but slightly over average at that, and considering you being 5'4, you should be perfectly fine.
I hope you have a fantastic day!
#873 HI 2019-02-20 06:27
Hi I am a 16 year old girl, I am 5"3 and weigh 83 pounds. But my stomach still looks chubby. I used to be fatter though, when I was 13 I weighed almost 30 pounds more than I do know. I started becoming fat around 10-11, and this time last year I was still fat and weighed about 25 pounds more. I hated what I looked like for years. I started losing a lot of weight recently and I'm scared my weight is just going to continue decreasing until I drop dead. Considering that only a week ago I weighed 86 pounds, and 2 months ago I weighed 97. My stomach still looks fat, but I don't want to be unhealthy. What do I do? Thank you :)
#872 insecure 2019-02-20 04:46
I’m a 13 year old girl, 5”00 and weigh 104 pounds. Am I fat? If so any diet tips are appreciated
#871 Julia 2019-02-18 07:04
I’m 13 and I’m 5’4 and I weigh 107. I feel like that’s to much and that I’m fat but I get called anorexic and skinny but I want to be more skinny. But I stress eat a lot that’s the problem. I put whatever in my mouth that I want to and won’t care at the moment but later on I actually hate myself for eating whatever. Or is my weight good for my age and size?
#870 Anxiety 2019-02-17 09:37
I’m a 15 yr old girl, I’m 167 cm tall and I weigh 87 kilos
#869 Jessica 2019-02-17 00:10
Back in 2002 when I was 10 years old, I went to the doctor's office and they said my weight was 91 lbs at the time. However, I've read from the CDC that a normal weight for a 10 year old is about 70 lbs. Would I have been considered overweight back then? I was still skinny compared to the other girls in my class.
#868 Erika 2019-02-16 23:19
I'm 5'1, a girl, and 13 years old from the last time I checked I was 128 pounds. I haven't checked in a bit but I'm just trying to lose weight do you have any tips for girls like me trying to lose weight. I really have self esteem issues because of my body and I feel so fat.
#867 Noora Emara 2019-02-15 16:40
I am 17 years old, 5'3 and 180 lbs. Has my weight reached an unhealthy point?
#866 Kallie 2019-02-14 18:19
I am so sorry! Have u seen a docter?
#865 Kallie 2019-02-14 18:12
I am 5,4 and 1056 pounds. I feel fat and want to reduce it. What is a simple way? Everyone says I'm thin as a stick.
#864 Mia 2019-02-14 02:28
Hi, I'm 12, 5'3 and 117 lbs I know it says I am a healthy weight but, I feel so fat. Any suggestions?
#863 Mary H. 2019-02-13 03:02
I'm 11, I'm 5"5, I'm a girl, and I'm 85 pounds. Am I underweight?
#862 Jay 2019-02-12 23:05
Yo right I'm 12 I'm 4,9 and I way 90kg is that normal or is it bad
#861 sad 2019-02-12 22:17
i’m 11, i’m 5’3 and 138 pounds. everyone tells me i’m just think but i know i’m fat.
#860 Issac 2019-02-12 20:56
Im a 12 year old boy and im 5'4, i weigh 115 but i dont feel thin enough. any suggestions?
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