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.
Quick Answer
Predicted adult height = (Father + Mother height) / 2, ± 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:
Height Prediction
Predict adult height.
Parental Method
Based on parent heights.
Percentiles
Growth chart comparison.
Unit Conversion
Feet/inches and cm.
Instant Results
Get predictions immediately.
100% Private
Your data stays private.
How to Height Calculator in 3 Easy Steps
Predict height:
Enter Parent Heights
Mother and father heights.
Select Gender
Child's gender.
Get Prediction
See predicted adult height.
Know Potential Height
Science-based prediction
Parental height method
Growth percentiles
Unit conversions included
Common Use Cases for Height Calculator
Perfect for:
Frequently Asked Questions
Everything you need to know about our height calculator
How can I predict my child's adult height?
(Father + Mother height) ÷ 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: ±4 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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