What is a normal height for an 8-year-old?

There is no single normal height for every 8-year-old because family pattern, growth tempo, and overall build vary. A percentile chart is more useful than one target number because it shows whether the child is staying on a familiar channel over time. Many healthy children at age 8 fall across a broad range, so the bigger question is whether growth remains steady and proportionate.

What is a normal weight for a 10-year-old child?

A normal weight for a 10-year-old depends on height, body frame, sex, and pubertal timing, so a single number on a scale is never the full story. Weight percentile is more meaningful when it is read with height percentile and BMI-for-age. Some children are naturally lighter or heavier and still healthy, while a repeated change in pattern matters more than one isolated reading.

What does the 25th percentile mean on a child growth chart?

A 25th percentile result means the measurement is greater than about 25% of the CDC reference group and lower than about 75% of children of the same age and sex. That can still be completely normal. Percentiles are descriptive, not grades. The most useful question is whether the child keeps following a similar curve over time rather than whether the number is exactly near the 50th percentile.

Why is BMI percentile different from weight percentile?

Weight percentile compares weight alone with same-age peers, while BMI percentile adjusts weight for standing height and age. A child can have an average weight percentile but a higher BMI percentile if height is relatively lower, or a lower BMI percentile if height is relatively higher. That is why BMI-for-age is often more useful than weight alone when screening older children and teens.

When do children usually have puberty growth spurts?

Girls often begin their biggest height acceleration earlier, commonly in the 10 to 13 year range, while boys more often peak a little later, commonly around 12 to 15 years. The exact timing varies widely. That variability is one reason percentiles can appear to shift during adolescence even when the underlying pattern is still healthy and expected for that child's stage.

Why do boys and girls use different child growth charts?

Boys and girls use different CDC charts because average growth pattern, body composition, and puberty timing differ by sex. The same age and the same raw measurement can map to a different percentile depending on whether the child is a boy or a girl. Using the correct sex-specific chart keeps the interpretation aligned with the right reference group.

Should I worry if my child's percentile drops between checkups?

A small percentile change is not automatically a problem. Measurement technique, recent illness, appetite changes, and normal growth timing can all move one point. Concern grows when the drop repeats over several visits, crosses multiple major percentile channels, or happens alongside fatigue, puberty concerns, or other symptoms. Repeated trend changes matter more than one isolated shift.

How often should I check a school-age child's growth at home?

For most families, checking every three to six months is enough to show meaningful change without creating too much noise. Measuring too often can make normal day-to-day variation feel more dramatic than it really is. Office visits, school-age growth pattern, and any medical concerns can justify a different schedule, but home tracking usually works best at broader intervals.

Is the 50th percentile the ideal result?

No. The 50th percentile is simply the median reference value, not the ideal target for every child. A healthy child can sit much lower or much higher and still be growing normally if the pattern stays steady and fits family background, puberty timing, and overall health. The chart is for context, not for chasing one preferred percentile.

At what age do children stop growing in height?

Most children slow substantially after the main pubertal growth spurt and approach adult height in the later teen years, but the exact timing varies. Many girls are close to final height earlier than boys, while some late-maturing teens continue growing a bit longer. A growth chart is useful here because it shows whether height gain is still active, slowing, or leveling off.

When should I talk to a doctor about my child's growth chart?

It is reasonable to ask for medical guidance when a child crosses several percentile channels, when weight and height stop looking proportionate, when BMI stays very high or very low, or when puberty seems unusually early or late. Concern is stronger when chart changes come with symptoms such as poor appetite, fatigue, chronic illness, or stalled development. The calculator is a screening aid, not a replacement for clinical assessment.

School-age and teen CDC charts

Child Growth Chart Calculator for Ages 5 to 20

Name: Child Growth Chart Calculator
Brand: Growth Chart Calculator
Availability: InStock

Use this child growth chart calculator for ages 5 to 20 to check CDC height, weight, and BMI percentiles with school-age growth guidance.

CDC-only calculator preset locked to ages 5 to 20 years.

Height, weight, and BMI-for-age stay together for one school-age readout.

Reference tables, puberty guidance, and FAQs help explain the numbers.

Child Growth Chart Calculator

This embedded calculator is tuned for school-age children and teens only. It starts at 60 months, ends at 240 months, uses CDC references throughout, keeps BMI visible, and removes head circumference so the page stays focused on the measurements most useful from age 5 forward.

Percentile results

Current percentile summary

Using: CDC

Select a sex above to see CDC percentile results for ages 5 to 20. The calculator keeps the age range and measurements ready, but it waits for the sex-specific chart before showing percentiles.

Loading percentile data…

Interactive charts

Visualize the current percentile position

Chart type

Metric

Choose girl or boy to load the correct CDC reference chart for this age range.

How to Read a Child Growth Chart During School Age

A child growth chart for ages 5 to 20 works the same basic way as earlier growth charts: the percentile shows where one measurement sits relative to same-age, same-sex CDC reference data. But school-age reading needs more patience because the curve often looks quiet for years and then changes faster during puberty. A child who has tracked near the 25th percentile for height can still be growing normally, and a child near the 75th percentile is not automatically healthier. What matters most is whether the pattern remains internally consistent over time. If you want the broad primer behind these percentile lines, start with the growth percentile guide.

Height and Weight Percentiles for Ages 5 to 20

Height percentile and weight percentile answer different questions. Height is usually the clearest long-run signal of growth tempo, while weight is more sensitive to appetite, illness, activity, and puberty-related body composition changes. A child can look ordinary on one measure and very different on the other without that automatically meaning something is wrong. The tables below summarize large reference rows for boys and girls so families can see how the lower, median, and upper CDC bands widen across late childhood and the teen years.

Boys CDC height and weight reference rows

School-age and teen CDC reference values for boys ages 5 to 20.

Age	Height P3	Height P50	Height P97	Weight P3	Weight P50	Weight P97
5 years	102	109.2	116.4	15.3	18.3	23.1
6 years	107.7	115.5	123.3	16.8	20.5	26.6
7 years	113	121.7	130.4	18.3	22.9	30.9
8 years	118.4	128	137.6	20	25.6	36.9
9 years	123.5	133.3	143.5	22	28.6	44
10 years	129.7	138.5	149.5	24.3	32.2	50.4
11 years	134.2	143.5	155.2	26.8	36	58.1
12 years	139.9	149.1	162.3	29.9	40.7	65.1
13 years	147.2	156.5	169.8	34	46.3	73.1
14 years	152.1	163.8	176.7	38.2	52	79.6
15 years	157.5	169	181.2	43.1	57.5	85.7
16 years	161.1	173.3	184.4	46.4	61.4	88.5
17 years	163.2	175.2	186.2	49.3	64.6	91.2
18 years	164.9	176.5	187.3	51.8	67.2	93
20 years	165.6	177	187.6	54.4	70	95.7

Girls CDC height and weight reference rows

School-age and teen CDC reference values for girls ages 5 to 20.

Age	Height P3	Height P50	Height P97	Weight P3	Weight P50	Weight P97
5 years	101.1	108.4	115.7	14.5	17.9	23.3
6 years	106.7	114.6	122.7	15.9	20.2	27
7 years	111.8	120.6	129.5	17.4	22.8	31.8
8 years	117.3	127.3	137.5	19.1	25.6	37.5
9 years	122.5	133.4	144.8	21.3	29	44.9
10 years	128.2	138.6	150.1	23.3	32.5	52.1
11 years	134.2	144.8	156.2	26.5	36.9	60.3
12 years	140.1	151.5	162.7	29.4	41.5	65.8
13 years	145.2	157.1	167.8	33.1	46.1	71.4
14 years	149	159.5	169.8	36.4	50.3	76.2
15 years	150.5	161	171.2	39.1	53.5	79.8
16 years	151.8	162.5	172.8	41.5	55.8	81.9
17 years	152.2	163	173.2	43.1	57.3	83.4
18 years	152.4	163.1	173.4	43.9	58	84.5
20 years	152.6	163.3	173.6	44.7	59	85.8

Reference values from CDC 2000 Growth Charts. All values are approximate. Individual variation is normal; consult a clinician for interpretation.

BMI Percentile for School-Age Children and Teens

BMI-for-age matters more in this age range because it helps frame weight in relation to standing height and age. That does not mean child BMI should be read like adult BMI. Pediatric BMI is percentile-based, and the same raw BMI can mean different things at age 7, 12, or 16. During growth spurts, BMI can shift even when nothing is clinically wrong because height and weight do not change at exactly the same speed. The most useful read comes from looking at BMI together with height percentile, weight percentile, and growth stage. For a deeper BMI-only explainer, use the BMI calculator for kids guide.

BMI percentile	Category	Meaning
Below P5	Underweight	Lower BMI-for-age screening range. Persistent readings deserve follow-up in clinical context.
P5-P85	Healthy Weight	Typical BMI-for-age range for most school-age children and teens.
P85-P95	Overweight	Higher-than-expected BMI range that needs trend-based interpretation rather than one isolated judgment.
P95 and above	Obese	Higher-risk BMI screening band where pediatric follow-up is usually recommended.

Growth Stages from Age 5 to 20

School-age and teen growth should be read in phases. A steady elementary-school pattern can look very different from an early-puberty or late-teen pattern, which is why percentile interpretation becomes more nuanced after age 10.

Stage	Typical age	Growth pattern
Late preschool to early school age	5-6 years	Growth is usually steady at about 5 to 6 cm per year, and body shape often starts to look longer and leaner.
Early school age	6-9 years	This is often the most stable growth phase, and many children hold a similar percentile channel for several years.
Pre-puberty	Girls 9-11, boys 11-13	The first signs of acceleration may appear, especially in weight and body composition, even before the main height spurt is obvious.
Peak puberty	Girls 11-13, boys 13-15	This is often the fastest height-gain phase, and some children add 6 to 12 cm in a year while BMI and weight shift at a different pace.
Late puberty	Girls 13-16, boys 15-18	Height gain slows, weight may keep rising, and body composition becomes more sex-specific as adolescence progresses.
Late adolescence	16-20 years	Height is usually close to stable, but weight and body composition can still keep adjusting toward adult patterns.

Puberty and the Growth Chart — What Changes and When

Puberty is the biggest reason a child growth chart can look dramatic after years of relative stability. Height can accelerate first, then weight may catch up later, or the reverse can happen. Some children look temporarily leaner during a fast height spurt, while others show a higher BMI percentile before height catches up. Puberty also changes appetite, sleep, activity, and body composition. A chart that suddenly looks more dynamic at age 11 to 15 is not automatically abnormal. The key question is whether the child's tempo still makes sense for the wider puberty picture.

Boys vs Girls Growth Patterns Ages 5 to 20

Boys and girls do not follow the same average timetable. Girls often begin puberty earlier and may move up the height curve sooner, while boys often peak later and continue growing longer into the teen years. BMI patterns can diverge too because girls often add body fat normally during puberty while boys often gain more visible lean mass. That is why this page keeps sex-specific CDC references and why detailed sex-based pages can be useful when families want a more tailored explanation. You can compare those routes in the boys growth chart and girls growth chart.

Measure	Girls	Boys
Puberty usually begins	About 10-11 years	About 12-13 years
Peak height spurt	About 11-12 years	About 13-14 years
Near-adult height	About 14-16 years	About 17-19 years
Puberty body-composition change	Body fat normally increases	Lean mass and muscle usually increase more
Typical P50 adult height	About 163 cm	About 177 cm

When a Child Growth Chart Deserves Closer Attention

It is reasonable to look more closely when height or weight crosses several major percentile channels, when BMI keeps trending in a new direction, or when the chart no longer fits the child's puberty stage or family pattern. Extra context also matters when chart changes happen alongside fatigue, long illness, feeding issues, delayed puberty, very early puberty, or other symptoms. The calculator helps flag patterns, but it cannot explain every cause. It is a screening and education tool, not a medical diagnosis.

Watch the trend

Repeated movement across two or more major percentile bands matters more than one isolated swing.

Match the stage

A puberty-timed shift may be expected; a similar shift far outside the expected stage deserves more review.

Use clinician context

Symptoms, family history, medications, chronic illness, and development history all change the interpretation.

Frequently Asked Questions About Child Growth Charts

These questions focus on school-age and teen height, weight, BMI-for-age, puberty timing, and how to use a CDC child growth chart from ages 5 to 20.

A child growth chart calculator for ages 5 to 20 compares a school-age child or teen's height, weight, and BMI-for-age with CDC reference data for the same age and sex. The result is shown as a percentile, which helps families see where one measurement sits relative to peers. It works best as a trend tool across repeated checkups rather than as a diagnosis from one data point.

Related Growth Chart Tools

Boys Growth Chart Girls Growth Chart BMI Calculator for Kids Toddler Growth Chart Growth Percentile Guide WHO vs CDC Charts

Child Growth Chart Calculator for Ages 5 to 20

Child Growth Chart Calculator

How to Read a Child Growth Chart During School Age

Height and Weight Percentiles for Ages 5 to 20

Boys CDC height and weight reference rows

Girls CDC height and weight reference rows

BMI Percentile for School-Age Children and Teens

Growth Stages from Age 5 to 20

Puberty and the Growth Chart — What Changes and When

Boys vs Girls Growth Patterns Ages 5 to 20

When a Child Growth Chart Deserves Closer Attention

Frequently Asked Questions About Child Growth Charts

What is a child growth chart calculator for ages 5 to 20?−

What is a normal height for an 8-year-old?+

What is a normal weight for a 10-year-old child?+

What does the 25th percentile mean on a child growth chart?+

Why is BMI percentile different from weight percentile?+

When do children usually have puberty growth spurts?+

Why do boys and girls use different child growth charts?+

Should I worry if my child's percentile drops between checkups?+

How often should I check a school-age child's growth at home?+

Is the 50th percentile the ideal result?+

At what age do children stop growing in height?+

When should I talk to a doctor about my child's growth chart?+

Related Growth Chart Tools