CalcaTools

Height Calculator | Convert Units and Predict Adult Height

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Converts height measurements between imperial and metric systems and estimates how tall a child will grow. Enter a height in feet and inches or centimetres, and the tool converts it instantly to the other unit. The child-growth mode uses the mid-parental height formula to predict adult height from both parents' heights.

Last updated: July 2026 · Free · No sign-up required

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Results

Enter values above and click Calculate to see your result instantly.

Quick reference

HeightCentimeters
5 ft 0 in152.4 cm
5 ft 6 in167.6 cm
6 ft 0 in182.9 cm
6 ft 4 in193.0 cm

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Every tool is plain HTML + JavaScript with the calculation logic compiled in. No spinner, no "verifying browser" splash, no five-second wait while ads load. Hit the page, fill the form, get the answer. Slow tools waste your time and ours.

devices Works on every device

Responsive design tested down to a 320px-wide phone screen. The input fields use native number/date keyboards on iOS and Android, the calculate button is thumb-sized, and the result still reads big and bold on the smallest screen. No app to download, ever.

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No newsletter pop-ups, no "create an account to see the answer", no fake countdown, no fake stock counter, no upsell. Two ad slots per page (clearly labelled as Advertisement) keep the site free — that's the whole business model.

Interpretation guide

Input styleTip
Feet/inchesConvert to total inches first
CentimetersDivide by 2.54 for inches
Growth/healthUse clinician charts for children

lightbulb Worked example — 5′9″ in centimetres

A medical form asks for height in centimetres; you are 5 feet 9 inches. Total inches = 5 × 12 + 9 = 69. Centimetres = 69 × 2.54.

Result: 175.26 cm.

What this means: Write 175 cm on the form — the conversion is exact by definition (1 in = 2.54 cm), so if another converter shows 175.3, that's just its rounding, not a different answer.

Formula & methodology

Formula: 1 inch = 2.54 cm; total inches = feet × 12 + inches

How height is converted and predicted

Unit conversion uses the exact international definition: 1 inch = 2.54 cm. Total inches = feet × 12 + inches, then multiplied by 2.54 for centimetres.

  • Conversions are exact — only display rounding varies between tools.
  • Child prediction uses the mid-parental method: (father's height + mother's height) ÷ 2, plus 6.5 cm for boys or minus 6.5 cm for girls.

The growth estimate is a statistical projection (most children land within ±10 cm of it), not a medical assessment — growth charts from a pediatrician remain the proper tool.

Authoritative source: timeanddate.com

Frequently asked questions

How do I enter feet and inches?
Enter feet and inches in the separate fields — 5 feet 9 inches goes in as 5 and 9, not 5.9 (which would mean 5 ft 10.8 in). The tool converts the total inches to centimetres, metres, and back.
Is 1 inch exactly 2.54 cm?
Yes — since 1959 the inch has been defined as exactly 2.54 cm internationally. So height conversions are exact by definition, and any two converters that disagree are just rounding differently.
How reliable is the child height prediction?
It is a statistical estimate, not a measurement: the mid-parental method lands within about ±4 inches for roughly 95% of children. Growth charts, nutrition, and the timing of growth spurts all move real outcomes. Treat it as a rough guide, not a medical assessment.
Why do my results differ from another calculator?
The Height Calculator is free, private, and accurate: it runs entirely in your browser (no uploads, no accounts), applies the standard calculation, and explains each step so you can verify the result. Converts height measurements between imperial and metric systems and estimates how tall a child will grow. Enter a height in feet and inches or centimetres, and the tool converts it instantly to the other unit. The child-growth mode uses the mid-parental There is no limit on usage, and it works on any device.
Can the height calculator replace professional advice?
No — the unit conversion is exact, but the child-growth estimate is a statistical projection based on parent heights and standard percentiles, not a medical assessment. Growth depends on genetics, nutrition, hormones, and health in ways no formula fully captures. If you have concerns about a child's growth, consult a pediatrician — the calculator is for estimation and general curiosity.
How tall should I be based on my parents' heights?
The mid-parental method: average your parents' heights, then add 2.5 in (6.5 cm) for boys or subtract 2.5 in for girls. Parents of 5'10" and 5'4" predict a son around 5'9.5" and a daughter around 5'4.5", with a real-world spread of ±3–4 inches. Genetics sets most of the range; nutrition and health determine where in it you land — a pediatrician's growth-curve tracking beats any formula for growing kids.
Does it predict a child's adult height?
Yes, using the mid-parental method: it averages the parents' heights, then adds 2.5 in (6.5 cm) for a boy or subtracts it for a girl. A 5'10" father and 5'4" mother predict a son around 5'9.5". It is a population average — individual kids vary widely.
Is my data sent anywhere when I calculate?
No — the conversion runs on the page itself, so your measurements never leave your device.
Why does it show 175.26 cm instead of 175.3?
It shows the full-precision result of inches × 2.54 and lets you round. For most purposes 175 cm is fine — the extra decimals only matter if you are chaining the value into another calculation.

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