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.


#896 Lexie 2019-03-19 17:47
Quoting kylie:
I’m Kylie and I’m 13 years old. I’m 145 pounds and 5’5” and I feel like I’m overweight. Am I and does anyone have a way to lose maybe 10-20 pounds

You are not over weight your fine when I was your age I thought the same way, and if you really want to lose weight I suggest eating as healthy as possible and try protein shakes for breakfast and try to run or join a sport.! Hope that helped
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#894 Thomas W 2019-03-18 23:57
I am 14, 6'1" (yes, very tall), and weigh roughly 160lbs. I hate myself. I hate my body and how fat I am. But I can't burn any of it away. Help me.
#893 Gianna 2019-03-17 22:59
I am 14 years and 11 months old. I weigh 180 pounds and stand at 5'9. I don't look very large, but other girls in my friend group weigh from 110-150. Even though they're all shorter than me, I am worried. My entire life I've been overweight, even though I play on 5 different sports teams and workout a lot. I try my best to eat healthy, but I binge eat sometimes. Although, towards the beginning of the school year, I got up to 205 lbs., but have lost 25 pounds. Yet, I haven't noticed a difference, except that my clothes fit better now. Summer is in 3 months and I would like to be 150 lbs. by than. Any advice would be very helpful.
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#891 Andrew Parker 2019-03-11 03:09
I'm 18 year old male 5'10 weighing about 115LBS...Weight gain is hell any advice?
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#889 Gina 2019-03-09 02:23
I'm 15, 5'7 and 174 pounds. I know I'm obese, but what can I do to lose weight?
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#887 Tiffany 2019-03-07 04:29
I'm 10 yrs old I weight 134 lbs should I be worried.
#886 Jarred 2019-03-05 02:44
So im 12 years and 11 months old im 5'1.5 and i weigh around 121 - 125 lbs am I obese i live in canada and we get a lot of snow so i cant exercise that much
#885 Bobbi 2019-03-01 23:43
Quoting aqualdeiododogredesh:
hi my name is aqualdeiododogredeshenia
and im four years old and i weigh 7.4 billion ibs should i be worried

Duds same but i AM toe
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#882 Chloe 2019-02-24 23:29

Hi I’m Chloe. I’m 12 5’6 and I weigh from 106 to 110. Am I overweight. Cause I feel bigger than everyone else. But the thing says I’m underweight. What do I do.
#881 Holly kay 2019-02-24 22:27
#880 aqualdeiododogredesh 2019-02-24 02:20
hi my name is aqualdeiododogredeshenia
and im four years old and i weigh 7.4 billion ibs should i be worried
#879 Ethan 2019-02-23 02:12
I am a 13 year old 5'7 male and 115 lbs. So if that is not unusual I do not know what it is.
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