Convert height between feet/inches and centimeters and predict a child's adult height from both parents' heights, right in your browser.
Height Calculator Online
Convert height between feet/inches and centimeters and predict a child's adult height from both parents' heights, right in your browser.
The Height Calculator runs entirely in your browser. The heights, parent measurements, and results you work with never leave your device and are not uploaded to ArrayKit.
Height Calculator converts height between feet/inches and centimeters and estimates how tall a child is likely to grow using the mid-parental method. In Convert mode, type a height in centimeters to see the feet/inches equivalent instantly, or enter feet and inches to get the metric value, with the total in inches shown alongside. In Predict mode, enter both parents' heights and pick the child's sex to get a rough adult height estimate, based on the well-known formula that averages the parents' heights and adds or subtracts about 6.5 cm. It is handy for filling out forms that expect a different unit, checking a growth chart, or satisfying curiosity about how tall a child might end up. Everything runs locally in your browser, so the heights you enter are never uploaded.
Features
Convert centimeters to feet and inches, or feet/inches to centimeters
Shows feet, inches, centimeters, and total inches together for every conversion
Predicts a child's likely adult height from both parents' heights
Separate estimate for a boy or a girl using the mid-parental method
Rounds feet/inches results to a practical one decimal place
Copy a plain-text summary of any conversion or prediction
Clear error message when a height field is missing or negative
Runs entirely in your browser with no height data sent anywhere
How to use the Height Calculator
Choose Convert or Predict child's height
In Convert, pick cm to ft/in or ft/in to cm and type the value
In Predict, enter both parents' heights in centimeters and the child's sex
Read the result and copy the summary if you need it elsewhere
Example
Input
180 cm
Output
5' 10.9"
180 cm converts to 5 feet 10.9 inches.
Common errors & troubleshooting
Converted feet/inches value looks off by a fraction of an inch. — The Height Calculator rounds inches to one decimal place, so tiny differences from a chart that rounds differently are expected and not an error.
Predict mode shows an error even though both heights were typed. — Enter both parents' heights in centimeters as a positive number greater than 0 — the prediction needs both figures to compute an estimate.
The predicted adult height doesn't match how tall the child actually grew. — The mid-parental method is a population-level estimate. Individual growth is affected by nutrition, health, and genetics the formula cannot account for.
Feet and inches were entered as a single decimal like 5.9 feet. — Enter feet and inches in the two separate fields (for example 5 and 11), not a decimal feet value, so the conversion reads the height correctly.
Frequently asked questions
What can the Height Calculator convert?
It converts height both ways: centimeters to feet and inches, and feet/inches to centimeters. It also shows the total height in inches for reference.
How does the Height Calculator predict a child's adult height?
It uses the mid-parental method: it averages both parents' heights in centimeters, then adds about 6.5 cm for a boy or subtracts about 6.5 cm for a girl.
How accurate is the child height prediction?
It is a rough estimate based on population averages, typically accurate to within a few centimeters for most children, but nutrition, health, and genetics can shift an individual's actual adult height.
Does the Height Calculator upload the heights I enter?
No. The Height Calculator runs entirely in your browser. The centimeters, feet, inches, and parent heights you type never leave your device.
Why does the feet/inches result show a decimal instead of a whole number?
Centimeter values rarely convert to a whole number of inches, so the Height Calculator rounds the remaining inches to one decimal place for a precise, practical figure.
Can I use the Height Calculator for adults, not just children?
Yes. Convert mode works for any height, adult or child. Predict mode is specifically for estimating a child's future adult height from parent heights.