Can I use a BMI percentile calculator for a child under 2 years old?

No, the tools in this group are designed for children ages 2 to 19 (or 2-20). For infants and toddlers under 2, pediatricians typically use weight-for-length charts rather than BMI.

Do these calculators require my child's sex for accurate results?

Yes, several tools including Inch Calculator and the CDC calculator use sex-specific growth charts, which can affect the percentile result because boys and girls grow at different rates.

Is the BMI percentile the same as BMI category?

No, BMI percentile compares your child to others of the same age and sex, while BMI category (underweight, healthy weight, overweight, obese) is based on fixed percentile thresholds: underweight below the 5th percentile, healthy weight at or above the 5th and below the 85th, overweight at or above the 85th and below the 95th, and obese at or above the 95th percentile.

Do I need to create an account to use these BMI percentile tools?

Most tools listed are free to use without an account. MDApp mentions optional account features for tracking, but the core calculator functions do not require sign-up.

Which growth standard do these tools use: CDC or WHO?

Calculator.net, Calculator Soup, Inch Calculator, and the CDC site use CDC growth charts. Omni Calculator is based on WHO's child growth standards, which may produce slightly different percentiles for the same measurements.

Body Metrics & Fitness6 options compared

BMI Percentile Calculator

MDApp’s BMI Percentile Calculator is designed for pediatric percentile assessment, using growth-chart-based interpretation for children. It helps determine if a child falls into underweight, normal, overweight, or obese percentile ranges. The calculator itself is free to use, with optional account features.

Percentile calculators

Editors’ Top PickBased on community votes

Calculator.net

calculator.net

Its BMI calculator supports children and teens (age 2-20) and interprets results using BMI-for-age percentile categor...

Open Calculator.net Read review →

Other OptionsRanked by votes

02
02
Calculator Soup
calculatorsoup.com
This BMI tool includes adult and child modes, with child calculations for ages 2-19. It presents child BMI percentile...
Open site View details
03
03
MDApp
mdapp.co
MDApp’s BMI Percentile Calculator is designed for pediatric percentile assessment, using growth-chart-based interpret...
Open site View details
04
04
Inch Calculator
inchcalculator.com
Its Child & Teen BMI Calculator computes BMI and percentile from age, sex, height, and weight inputs. The results inc...
Open site View details
05
05
Omni Calculator
omnicalculator.com
Use the BMI percentile calculator to assess your child's development pattern and learn where they place among their p...
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06
06
Centers for Disease Control and Prevention (CDC)
cdc.gov
CDC’s Child and Teen BMI Calculator provides BMI, BMI percentile, and weight category for ages 2 to 19. It uses sex- ...
Open site View details

Side by side

BMI Percentile Calculator options compared

Tool	Best for	Strengths	Limitations
Calculator.net calculator.net	Families needing a free, general BMI percentile tool	Free without mandatory payment Supports ages 2-20 References CDC growth charts	General site design, not pediatric-specific No sex-specific categorization in excerpt
Calculator Soup calculatorsoup.com	Users wanting adult and child modes in one tool	Includes both adult and child modes Presents percentile interpretation bands Free, no subscription required	Child mode covers ages 2-19 only Fewer unit options than some competitors
MDApp mdapp.co	Parents wanting sex-specific pediatric BMI percentiles	Computes BMI and percentile from age, sex, height, weight CDC-based percentile classification Free and in-browser	Community votes low (2), suggesting fewer user reviews
Omni Calculator omnicalculator.com	Those who want WHO growth standards instead of CDC	Based on WHO's child growth standards Assesses development pattern among peers Free to use	Community votes low (2) Page excerpt mentions WHO standards but not CDC
Centers for Disease Control and Prevention (CDC) cdc.gov	People who need the official CDC growth chart tool	Free to use with no paid plan required Uses sex- and age-specific growth chart logic Plots percentile results on CDC growth charts	Limited to ages 2-19 only No adult BMI mode

Buyer's guide

How to choose a bmi percentile calculator

When picking a BMI percentile calculator for a child, the most important factors are the age range covered and whether the tool uses CDC or WHO growth standards. If you need a quick, free calculation for ages 2-20, Calculator.net or the CDC site will serve you well. If you want sex-specific classification or want to track growth patterns over time, MDApp or Inch Calculator are better options. Differences in unit support, whether the tool includes adult mode, and the underlying growth standard (CDC vs WHO) are worth caring about depending on your specific needs.

Questions

BMI Percentile Calculator FAQ

Can I use a BMI percentile calculator for a child under 2 years old?: No, the tools in this group are designed for children ages 2 to 19 (or 2-20). For infants and toddlers under 2, pediatricians typically use weight-for-length charts rather than BMI.
Do these calculators require my child's sex for accurate results?: Yes, several tools including Inch Calculator and the CDC calculator use sex-specific growth charts, which can affect the percentile result because boys and girls grow at different rates.
Is the BMI percentile the same as BMI category?: No, BMI percentile compares your child to others of the same age and sex, while BMI category (underweight, healthy weight, overweight, obese) is based on fixed percentile thresholds: underweight below the 5th percentile, healthy weight at or above the 5th and below the 85th, overweight at or above the 85th and below the 95th, and obese at or above the 95th percentile.
Do I need to create an account to use these BMI percentile tools?: Most tools listed are free to use without an account. MDApp mentions optional account features for tracking, but the core calculator functions do not require sign-up.
Which growth standard do these tools use: CDC or WHO?: Calculator.net, Calculator Soup, Inch Calculator, and the CDC site use CDC growth charts. Omni Calculator is based on WHO's child growth standards, which may produce slightly different percentiles for the same measurements.

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