Calculators
Height Calculator
Predict a child's adult height.
Free account14-day Pro trialWorks in your browser
Sign in to use this tool
Create a free account to unlock every tool — plus a 14-day free trial of HQ Pro, no card required.
About the Height Calculator
Curious how tall a child will be? Enter the mother's and father's heights and the child's sex and the calculator predicts adult height using the mid-parental (Tanner) method. It's an estimate with a natural ±4-inch range — genetics, nutrition, and health all play a part.
How to use the Height Calculator
- 01Enter your child's sex and both parents' heights.
- 02Read the result instantly — it recalculates as you type.
- 03Adjust the numbers to model different scenarios.
Frequently asked questions
How accurate is a height prediction?
The mid-parental method typically lands within about 4 inches of actual adult height, but individual outcomes vary.
What is the formula?
Average the parents' heights, then add 2.5 inches for a boy or subtract 2.5 inches for a girl.