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.



#1145 Savannah Williams 2021-04-12 14:58
Quoting Sophia Habermehl:
Hi, I have been wondering is it bad that i am 10, turning 11 in september, (It is April 8th, 2021) and im 5'3, and weigh around 143 lbs?? -Sophia.

I think that is something to worry about Sophia. I'm pretty sure overweight for a 10 year old is 102 pounds or something like that...but you are pretty tall so I don't really know.
#1144 ashlue cool 2021-04-11 21:39
I am 13 and a half years old, 5 feet one inch, and 134 pounds. It is April 2021 and in October of 2020, I was 117 pounds. Am I overweight and gaining weight too fast?
#1143 Ellexis 2021-04-08 23:50
I really hate myself, I’m 135.3 pounds, I get made fun of and don’t know how to lose weight, it’s so hard being the biggest one in your class, I’m only 4’11 to! I hate my life, it sucks, how do I lose weight!?
#1142 Sophia Habermehl 2021-04-08 21:57
Hi, I have been wondering is it bad that i am 10, turning 11 in september, (It is April 8th, 2021) and im 5'3, and weigh around 143 lbs?? -Sophia.
#1141 Chole 2021-04-08 00:43
Hi! I’m 11 years old about to be 12 I’m 84 pounds is that overweight or underweight?
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#1137 Siena Lundberg 2021-04-06 15:39
Hi! i’m a 11 year old girl who is 5’2” and weighs 103 pounds am i overweight? i’m very worried
#1136 Aera 2021-04-06 04:37
Hi! I'm a female 10 year old that is 4'11 and weighs 90.6 pounds. Is that healthy? I'm very worried.
#1135 Chloe 2021-04-06 03:01
Hey! I’m 12 years old and I’m 5 feet tall and 117 pounds. My BMI calculator says I’m overweight but I’m not too sure. I have lots of arm and leg muscle. Am I overweight?
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#1133 Anonymous 2021-04-03 04:54
Hi I am 14 years old and 5'8", I weigh about 92 pounds, but last week I was 134. My best friend told me that it wasn't healthy and that I weighed less then her but she isn't even 5 ft. I have body image issues so I am still wanting my weight to be lower. Am I underweight? It doesn't show on my body though I look like I should weigh a lot more than I do. I am a ballet dancer though so I know a good amount of my weight is muscle but I also know there is a lot of fat. Please help me understand.
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#1131 Andrew 2021-04-01 00:44
Im 14, 5' 10", 123lbs, im skinny, and people call me a stick and things like that at school. Ive gotten used to it but I want to be 135-140 by the time freshman year starts, (120 days or so). Good luck to everybody out there. Remember what Jesus did on the cross to die for your sins. Do EVERYTHING for the Glory of God. God Bless!
#1130 Allie 2021-03-31 16:55
Hey yall! I am 12 years old, 113 punds and five foot 1 and a half! Am i fat? keep in mind i have a rather large bottom
#1129 Lilly 2021-03-31 12:15
Hi guys. I have been so worried about this for so long. I am 4 foot 8 and I weigh 92 pounds and I am 11. Am I fat
#1128 Kaidan 2021-03-29 05:22
I’m 14 5,4 173 pounds. I’m obese. I’m so tired. I’ve tried so much. I’ve gone 5 days without eating and lost one pound. When will I ever be skinny and thin. I’m so mad at myself.
#1127 Lana 2021-03-26 22:30
I am 13 and 5' 6" weighing I'm at about 145-150 I have a bit of a muffin top and thick thighs am I considered fat?
#1126 Kirsten 2021-03-25 20:34
I am 12 years old, weigh 108 pounds, and I am about 4 '. Am I obese? Most of my weight is in my thighs and my hips, so I have a muffin top and love handles. How can I get rid of it?
#1125 Mallory 2021-03-25 19:22
Hi. I am a 12-year-old female and I am 5,1. But my siblings say I am short :(
#1124 Randall Petermann 2021-03-25 00:22
I tried this on my cousin and he is an 11 year old 143 pounds and about 5'1. He is confused if that is ok because a doctor said he is a little overweigth and he is really confused.
#1123 Saida 2021-03-19 14:35
I’m 14, 5’3” and my weight fluctuates from 98-103 pounds. I always find myself wanting to be lighter and wishing I was skinnier. I was diagnosed with anorexia nervosa restricting type, I just want advice on how to deal with it.

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