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.



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#1273 Kailey 2021-08-02 01:50
I’m 12, 5’3, and 12. After I eat I weigh 130 pounds. Is that bad? Sometimes it 126-8.
#1272 Lilly 2021-07-30 08:01
Quoting Spice:
im 13 yr old female 4'11 and 109 pounds am i under or over weight pls i need to know

Quoting Spice:
im 13 yr old female 4'11 and 109 pounds am i under or over weight pls i need to know

You are at a healthy weight 3 more pounds and you will be briefly over weight
#1271 nonamepoopoohead 2021-07-27 22:38
[quote name="nonamepoo poohead"]im 5 2 and 109 pounds and i gained like 9 pounds in a month and i eat like 3500 calories a day lol and im 11
#1270 nonamepoopoohead 2021-07-27 22:34
im 5 2 and 109 pounds and i gained like 9 pounds in a month and i eat like 3500 calories a day lol
#1269 Esther 2021-07-25 20:40
I hate this. I am suddenly feeling insecure
#1268 Lea 2021-07-25 05:02
I’m Lea, 5’2 and 125. I’m 11
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#1263 Savanah. R 2021-07-21 07:07
hi im Savanah a female and im 14 in about 2 months my height is 5´1 and weight about 103 lbs ive been strugging with feeling fat but i might possibly be an ectomorph (look it up) but im wondering if im health or not
#1262 Sam 2021-07-15 05:23
Its really sad to see such young girls concerned about their weight. You are not overweight, you are 11 go have fun with friends. Dont get into weight watching now or your teen years will be hell. I love ya
#1261 harper 2021-07-15 00:56
i am 16 years old and weigh 74 pounds, my height is 4’10 and i was just wondering since i’m so short is this a healthy weight?
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#1259 penelope 2021-07-14 16:37
Quoting emily:
hey!! im 4'7, 11 years old and i weigh 80 pounds am i healthy i really feel like im underweight and too skinny and im really insecure about myself :(

i'm pretty sure you're average weight. if you want to gain "healthy" weight, you should try:
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good luck lol
#1258 emily 2021-07-10 04:48
hey!! im 4'7, 11 years old and i weigh 80 pounds am i healthy i really feel like im underweight and too skinny and im really insecure about myself :(
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