Health Calculators

Child Height Predictor

Predict your child's likely adult height range using the Tanner mid-parental height method, based on both parents' heights and the child's gender. Shows an honest range instead of a single misleadingly precise number.

How to Use the Child Height Predictor

Use the Child Height Predictor to predict your child's likely adult height range using the Tanner mid-parental height method, based on both parents' heights and the child's gender. Shows an honest range instead of a single misleadingly precise number.. Enter your values to get accurate, instant results tailored to your situation.

Free health calculators for BMI, calories, body fat, pregnancy, and fitness tracking. Monitor your wellness with accurate health tools.

Common Uses

• Calculate child height predictor accurately and instantly
• Calculate kid height calculator accurately and instantly
• Calculate adult height prediction accurately and instantly
• Calculate mid parental height accurately and instantly
• Calculate how tall will my child be accurately and instantly

Related Calculators

• BMI Calculator
• Ideal Weight Calculator
• Pregnancy Calculator

More Health Calculators

• Basal Metabolic Rate Calculator
• BMI Calculator
• Goal Tracker
• Quit Smoking Calculator
• Quit Drinking Calculator
• Body Fat Percentage Calculator

Browse all 319+ free online calculators

Understanding Height Prediction

How the mid-parental method works

Expert Tips

• Show a Range, Not a Number: The mid-parental method has a real documented margin of error (±10cm boys, ±9cm girls) - always present it as a likely range, not a false-precision single figure.
• Genetics Is Only Part of the Story: Nutrition, health conditions, and puberty timing all influence actual adult height beyond what a genetics-based formula can predict.

The Formula — Tanner mid-parental method

Mid-Parental Height

• Average Both Parents: Add the mother's and father's heights and divide by two to get the mid-parental height baseline.
• Gender Adjustment: Add 6.5cm for boys or subtract 6.5cm for girls to account for the average adult height difference between men and women.

Frequently Asked Questions

How accurate is this height prediction?

The mid-parental method has a documented margin of error of about ±10cm (4 inches) for boys and ±9cm for girls - that's why we show a range, not just one number. It's a useful estimate based on genetics, but doesn't account for nutrition, health conditions, or other factors that influence actual growth.

What is the mid-parental height method?

It's a formula developed by researchers Tanner, Goldstein, and Whitehouse in 1970 that estimates a child's adult height from the average of both parents' heights, adjusted for the child's gender. It remains one of the most widely used quick estimation methods today.

Why do boys get +6.5cm and girls -6.5cm?

This adjustment reflects the average height difference between adult men and women (about 13cm/5 inches total). Adding half that difference for boys and subtracting half for girls centers the prediction correctly for each gender.

Does this work for adopted children or if I don't know both biological parents' heights?

No - this method specifically relies on biological parents' heights since it's based on genetic inheritance patterns. Without both biological parents' heights, this calculator cannot produce a meaningful estimate.

Are there more accurate methods?

Yes - methods like Khamis-Roche also factor in the child's own current height, weight, and age, which can narrow the margin of error further. Those methods require additional measurements this calculator doesn't currently collect.

What does the 'Current Height vs. CDC Growth Chart' section show?

It's a separate comparison, not part of the adult-height prediction. If you enter your child's current age (2-20) and current height, we show what percentile that places them at among children the same age and sex, using the CDC's 2000 growth-chart reference data. It tells you how your child is tracking right now - it doesn't use parents' heights and doesn't change the mid-parental adult-height prediction above.