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Free Height Calculator - Predict Adult Height

Predict adult height based on parent heights, current age, and gender. Includes height conversion between units and percentile rankings.

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Calculate Height

Quick Answer

Predicted adult height = (Father + Mother height) / 2, ยฑ 2.5" by gender. Average US adult: men 5'9", women 5'4".

Key Facts about Height Calculator:

  • Genetics account for ~80% of height
  • Average US male: 5'9" (175 cm)
  • Average US female: 5'4" (163 cm)
  • Girls stop growing around 16
  • Boys stop growing around 18

Why Use Our Height Calculator?

Complete height calculations:

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Height Prediction

Predict adult height.

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Parental Method

Based on parent heights.

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Percentiles

Growth chart comparison.

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Unit Conversion

Feet/inches and cm.

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Instant Results

Get predictions immediately.

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100% Private

Your data stays private.

How to Height Calculator in 3 Easy Steps

Predict height:

1

Enter Parent Heights

Mother and father heights.

2

Select Gender

Child's gender.

3

Get Prediction

See predicted adult height.

Know Potential Height

Science-based prediction

Parental height method

Growth percentiles

Unit conversions included

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Height Prediction
Based on genetics

Common Use Cases for Height Calculator

Perfect for:

Parents

Predict child's adult height.

Predict Height

Growth Tracking

Compare to percentiles.

Check Percentile

Conversion

Convert height units.

Convert Height

Frequently Asked Questions

Everything you need to know about our height calculator

How can I predict my child's adult height?

(Father + Mother height) รท 2, then +2.5" for boys, -2.5" for girls

Mid-parental height method: (Father height + Mother height) / 2, then add 2.5 inches for boys or subtract 2.5 inches for girls. Accuracy: ยฑ4 inches.

What is the average adult height?

US: Men 5'9" (175 cm), Women 5'4" (163 cm)

US averages: Men 5'9" (175 cm), Women 5'4" (163 cm). Global averages are slightly lower. Netherlands has tallest averages globally.

When do people stop growing?

Girls: ~16, Boys: ~18, growth plates close by 21-25

Most reach adult height by 16 (girls) or 18 (boys), but growth plates may not fully close until 21-25. After puberty, height increase is minimal.

Still have questions? Try the tool yourself!

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