Height Calculator
Height Calculator

Height Calculator — Compare, Convert & Understand Any Height

Predict your child’s adult height, track growth percentiles for babies, boys and girls, and convert any height between cm and feet/inches — all in one free calculator.

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Growth Chart Preview
0 — 20 yrs
175 cm 5 ft 8.9 in
P62 CDC 2–20y
Visual Comparison

Compare Any Heights Side by Side

Pick people, celebrities, animals, characters and more — see them drawn to scale next to each other. Everything runs in your browser.

Comparison Canvas

Accurate, proportional visual comparison for humans and animals on an aligned baseline.

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Interactive Controls: Drag models horizontally to reposition • Drag top handle vertically to resize physical height • Use arrow keys for ±1 cm.
Measurement Reference: Four-legged animals are measured to the shoulder or withers. Heads and ears naturally extend above the shoulder line.
0 cm / Floor Baseline

Comparison Summary

Overview of all active comparison items

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Live Height Calculators

Convert units, check a growth percentile, or predict a child’s adult height — right here, right now. Everything runs in your browser; nothing is uploaded or stored.

Height Unit Converter

Type a height on either side — the other side converts instantly.

cm
Feet / Inches
ft
in

Exact international standard: 1 inch = 2.54 cm.

Calculator Suite

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.

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Girls Height Calculator

Quick height check for girls against CDC growth references.

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Baby Height Calculator

Length-for-age percentiles for babies 0–24 months (WHO).

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Boys Height Percentile Calculator

Exact percentile + z-score with CDC / WHO / UK-WHO switcher.

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Girls Height Percentile Calculator

Exact percentile + z-score with CDC / WHO / UK-WHO switcher.

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Child Height Predictor

Predict adult height from parents' heights, with honest range.

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Boys Growth Chart

Interactive CDC/WHO percentile curves — plot your own point.

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Girls Growth Chart

Interactive CDC/WHO percentile curves — plot your own point.

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UK Boys Height Percentile

UK-WHO chart percentiles for ages 2 weeks–4 years.

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How It Works

Three Steps to Understand Any Height

No sign-up, no downloads. Measure once, enter the numbers, and get answers grounded in real growth data.

1

Measure

Measure height accurately — barefoot, back straight against a wall, heels together — to the nearest 0.1 cm or ⅛ inch. For babies, measure lying down (length).

2

Enter

Enter the height in centimeters or feet and inches. Add age and sex for percentile checks, or both parents’ heights for the child adult-height predictor.

3

Understand

Get instant unit conversions, percentile rankings against CDC & WHO growth charts, and honest child height estimates — with the data behind every number.

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.

  • 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.

Got Questions?

Frequently Asked Questions

How the Height Calculator works — percentiles, predictions, units and data sources.

What does the Height Calculator do?
Height Calculator is a free height calculator for babies, boys, girls and adults. Convert any height between centimeters and feet/inches, compare heights side by side, calculate the exact difference between two heights, check where a child’s height falls on a percentile chart, and estimate a child’s future adult height from the parents’ heights. Every result is an educational estimate — not medical advice.
How is a height percentile calculated?
A height percentile compares a child’s height against large population reference datasets for the same age and sex. A child at the 75th percentile is taller than about 75 out of 100 peers of the same age and sex. Our percentile references are based on the CDC growth charts (United States, ages 2–20) and the WHO Child Growth Standards (birth to age 5, used worldwide).
How accurate is the child height predictor?
The predictor uses the mid-parental height method, the standard formula pediatricians reference. For boys it is (father’s height + mother’s height + 13 cm) ÷ 2; for girls, (father’s height + mother’s height − 13 cm) ÷ 2. It is an estimate, not a guarantee: most children end up within about 8–10 cm (3–4 inches) of the predicted value, and genetics, nutrition, sleep and health all influence final height. No predictor is 100% accurate.
Where does the growth data come from?
Our percentile and growth-chart references come from two authoritative public sources: the CDC (Centers for Disease Control and Prevention) growth charts, based on US national health surveys for ages 2–20, and the WHO (World Health Organization) Child Growth Standards for birth to age 5, built from a multi-country study of healthy children. Unit conversions use the exact international standard (1 inch = 2.54 cm).
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Open the Height Calculator hub — percentiles, growth charts, child height prediction and unit conversion, all in one place.

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