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Height Calculator | Convert Units and Predict Adult Height

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

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

Let's say you are using the Height Calculator. 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 Enter the values that match your situation into the input fields and press calculate — using realistic numbers makes the result directly useful for you.

Result: The calculator instantly applies the formula 1 inch = 2.54 cm; total inches = feet × 12 + inches and returns the result with appropriate precision.

What this means: Read the result in the context of what you are measuring. The step-by-step breakdown lets you confirm the math and understand which input most affects the outcome.

Formula & methodology

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

The Height Calculator is built on a well-established calculation method. It uses the formula 1 inch = 2.54 cm; total inches = feet × 12 + inches to turn your inputs into a reliable 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 The steps are shown on the page so you can follow the reasoning from input to output.

Height conversions are fixed unit conversions. For medical growth assessment, age- and sex-specific percentile charts are more appropriate than a basic converter.

Authoritative source: timeanddate.com

Frequently asked questions

How do I use the height calculator?
Enter a height in feet and inches or centimetres, and the tool converts it using the exact factors: 1 inch = 2.54 cm and total inches = feet × 12 + inches. The child-growth estimator additionally compares the child's height and age against standard growth percentiles. For example, 5 ft 10 in equals 70 inches, or 177.8 cm.
What formula does the height calculator use?
The Height Calculator uses the standard 1 inch = 2.54 cm; total inches = feet × 12 + inches. You enter your values, and the calculator applies the formula step by step, showing the working so you can verify the math and understand how the result is derived rather than trusting a black box.
Is the height calculator accurate?
The Height Calculator applies the standard formula: 1 inch = 2.54 cm; total inches = feet × 12 + inches. It is tested against published worked examples before launch and uses native double-precision arithmetic, so results are accurate to typical precision for the values you enter — with no intermediate rounding that could distort the answer.
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.
What does the Height Calculator do?
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. The calculator takes your inputs, applies the standard calculation, and returns a clear result so you can make an informed decision without doing the math by hand.
Is the Height Calculator free and private?
Yes — the Height Calculator. There is no sign-up, no paywall, no trial, and no limit on how many calculations you can run. CalcaTools covers its costs with non-intrusive display advertising, so the calculator itself never asks for payment or restricts any feature.
How accurate is the Height Calculator?
The unit conversions are exact — 1 inch = 2.54 cm and total inches = feet × 12 + inches are precise definitions. The child-growth projection is an estimate with a typical range of about ±5 cm (2 inches) around the predicted adult height. Actual adult height depends on nutrition, health, and timing of puberty, which the statistical model cannot predict individually.

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