How tall might your child be?
Current height and possible adult height
Find your child’s height percentile. From age 4, add weight and both biological parents’ heights for a broad adult-height estimate.
Step 1
Enter the measurements
Step 2
Height percentile and estimate
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- Family height range
- Not entered
- Adult-height estimate
- Available starting at age 4
Parent heights are optional at this age.
The results above use the child’s growth chart and any parent heights entered.
Plan for clothing and car-seat limits
Project when this child may reach a clothing or car-seat limit. The planner uses WHO references before age 2 and CDC references from age 2.
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- Estimated adult height
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- Current height percentile
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- Family height range
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- Age used in the formula
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The center of the research range.
Where the current measurement sits on the CDC growth chart.
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The formula uses the nearest half-year age group.
About this range
The range applies the average 90% error bound reported across ages 4 to 17.5 in the original study.
Puberty timing is the largest source of uncertainty in this estimate. The original model was developed from 433 White children in southwest Ohio, so results may differ for children unlike that study group.
How much do the entered measurements affect this result?
Where the estimate comes from
The adult-height model
The center estimate uses the corrected Khamis–Roche equation with exact age, current standing height, current weight, and the average height of both biological parents. It provides adult-height estimates from ages 4.0 through 17.5.
The coefficients come from 223 White boys and 210 White girls in the Fels Longitudinal Study in southwest Ohio.
Current growth position
Before age 2, current position uses the WHO 2006 length-for-age standard; from age 2 it uses the CDC 2000 stature-for-age reference. Standing height entered before age 2 is adjusted by 0.7 cm for WHO scoring.
The research range
The original paper reported average 90% absolute-error bounds of 2.101 inches for boys and 1.675 inches for girls over ages 4.0 through 17.5. This calculator adds and subtracts the applicable published average from the center estimate.
Other reference values
The current percentile uses the official CDC 2000 stature-for-age LMS reference. The family range uses the conventional sex-adjusted mid-parental target-height formula with a broad ±10.2 cm range. Both appear alongside the Khamis–Roche estimate.
Sources: Khamis & Roche (1994), 1995 coefficient erratum, WHO infant LMS data, and CDC LMS data.