Height Calculator
Compare, Convert & Understand Any Height
Enter a child's age and height to see their growth percentile, explore interactive CDC and WHO growth charts, or predict adult height from parents' heights — all calculated from published growth references, right in your browser.
Please note: these are educational estimates based on published growth references, not medical advice. If you have concerns about a child's growth, consult a pediatrician.
Boys quick check
How does his height compare? Enter age and height for an instant CDC percentile.
Result
- Z-score
- Median for age
- Entered height
Please note: these are educational estimates based on published growth references, not medical advice. If you have concerns about a child's growth, consult a pediatrician.
Girls quick check
How does her height compare? Enter age and height for an instant CDC percentile.
Result
- Z-score
- Median for age
- Entered height
Please note: these are educational estimates based on published growth references, not medical advice. If you have concerns about a child's growth, consult a pediatrician.
Baby quick check
Length-for-age percentile for babies 0–24 months, from the WHO Child Growth Standards.
Result
- Z-score
- Median for age
- Entered height
Please note: these are educational estimates based on published growth references, not medical advice. If you have concerns about a child's growth, consult a pediatrician.
Quick prediction
Enter both parents' heights to estimate a child's likely adult height — always with an honest range.
Predicted adult height
Every height calculator, in one place
Nine focused tools — percentiles, growth charts, and prediction — each built on published CDC, WHO, and UK-WHO references.
Boys Height Calculator
Quick height check for boys against CDC growth references.
Open calculatorGirls Height Calculator
Quick height check for girls against CDC growth references.
Open calculatorBaby Height Calculator
Length-for-age percentiles for babies 0–24 months (WHO).
Open calculatorBoys Height Percentile Calculator
Exact percentile + z-score with CDC / WHO / UK-WHO switcher.
Open calculatorGirls Height Percentile Calculator
Exact percentile + z-score with CDC / WHO / UK-WHO switcher.
Open calculatorChild Height Predictor
Predict adult height from parents' heights, with honest range.
Open calculatorBoys Growth Chart
Interactive CDC/WHO percentile curves — plot your own point.
Open calculatorGirls Growth Chart
Interactive CDC/WHO percentile curves — plot your own point.
Open calculatorUK Boys Height Percentile
UK-WHO chart percentiles for ages 2 weeks–4 years.
Open calculatorHow it works
Measure
Measure height standing straight against a wall (or length lying down for babies under 2). Morning measurements are the most consistent.
Enter
Type in age and height — in centimetres or feet and inches. Pick the growth reference: CDC, WHO, or UK-WHO.
Understand
See the percentile, z-score, and how the measurement compares with the reference median — plus an honest note whenever data doesn't cover an age.
Based on published growth references
Every percentile on this site is computed from official LMS tables — the same references pediatricians use. We never estimate outside the ages each reference covers.
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CDC (US)
CDC 2000 Growth Charts, stature-for-age (National Center for Health Statistics)
Official source -
WHO
WHO Child Growth Standards, length/height-for-age (WHO Multicentre Growth Reference Study, 2006)
Official source -
UK-WHO
UK-WHO growth charts (RCPCH): ages 2 weeks-4 years follow the WHO Child Growth Standards
Official source
Read the full methodology → — formulas, data sources, rounding rules, and limitations.
Height calculator FAQs
What is a height percentile?
A percentile tells you where a child's height falls compared with children of the same age and sex in a reference population. A 50th percentile means about half of peers are shorter and half are taller; a 90th percentile means the child is taller than about 90% of peers. It is a comparison, not a grade.
Which growth reference should I use — CDC, WHO, or UK-WHO?
Use CDC for ages 2–20 (the US reference, standing height), WHO for birth to 5 years (the international standard; length is measured lying down under age 2), and UK-WHO for ages 2 weeks to 4 years (the UK charts, which follow WHO data in that window). Our tools only compute results inside each reference's published age range.
How accurate is the child height predictor?
It uses the classic mid-parental height formula, which estimates genetic target height — not a guaranteed outcome. Most children end up within ±8.5 cm of the predicted value, and no method predicts adult height exactly. We always show the range alongside the prediction.
Is this medical advice?
No. These are educational estimates based on published growth references. Percentiles describe where a measurement falls in a reference population; they cannot diagnose anything. If you have concerns about a child's growth, consult a pediatrician.
Do you store the measurements I enter?
No. Every calculation runs entirely in your browser — ages and heights are never sent to a server or stored anywhere.
Why is there no result for some ages?
Each growth reference only covers the ages its published tables were built for — for example, the CDC reference starts at 2 years and the UK-WHO reference ends at 4 years. Rather than guessing beyond published data, the calculator shows an honest notice instead of a number.
Start Calculating
Percentiles, growth charts, and honest predictions — free, private, and based on the references pediatricians use.
Calculate now