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Height Calculator

Convert height between units and predict a child's adult height.

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Convert a height

Type into any box and the others follow.

Feet and inches

Predict a child's adult height

The mid-parental method — a genetic midpoint, not a forecast.

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The prediction carries a genuine margin of roughly 8 to 10 cm either side. Nutrition, health, puberty timing and ordinary genetic variation all move the outcome. See a paediatrician about any real concern over growth.

Quick Tool Overview

The Height Calculator is two tools in one: a converter that moves between feet and inches, centimetres and metres in any direction, and a child adult-height predictor using the mid-parental method.

What it does
Converts height units and predicts a child's adult height
You give it
A height to convert, or both parents' heights and a child's sex
You get back
The converted height, or a predicted adult height range
Best for
Forms in unfamiliar units and curiosity about a child's growth
Calculators Free, unlimited use No sign-up Runs in your browser

About the Height Calculator

Two height tools in one. The converter moves between feet and inches, centimetres and metres in any direction, which covers the everyday job of filling in a form that wants units you do not think in.

The predictor estimates a child's adult height using the mid-parental method: average the parents' heights, then add or subtract 6.5 centimetres depending on the child's sex. It is a rough guide with a genuine margin of around 8 to 10 centimetres either way, because nutrition, health and the ordinary variation of genetics all play a part. Use it as a talking point rather than a forecast, and see a paediatrician about any real concern over growth.

Key features of the Height Calculator

Every direction

Feet and inches, centimetres and metres convert both ways, which covers the everyday job of a form wanting units you do not think in.

Mid-parental prediction

Average the parents' heights, then add or subtract 6.5 centimetres depending on the child's sex.

A range, not a number

The genuine margin is around 8 to 10 centimetres either way, and the result is presented as a range because of it.

Honest framing

Nutrition, health and ordinary genetic variation all play a part, so the prediction is a talking point rather than a forecast.

Instant conversion

Type in one unit and the others fill in as you go.

How to use the Height Calculator

  1. 1

    Convert a height

    Type into any unit box and the others update instantly, in both directions.

  2. 2

    Enter both parents' heights

    For the prediction, add the biological mother's and father's heights in any unit.

  3. 3

    Read the predicted range

    The estimate is shown with a realistic margin either side rather than as a single number.

Frequently asked questions

Divide by 2.54 to get total inches, then divide by 12 for feet with the remainder as inches. 180 cm is about 70.9 inches, which is 5 feet 10.9 inches.

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