Height Calculator
Predict your child's adult height using proven scientific methods. Choose from mid-parental height or the more accurate Khamis-Roche method that factors in the child's current measurements.
Mid-Parental Height Method
Uses parents' heights to predict child's adult height. Best for infants and very young children.
Khamis-Roche Method
More accurate prediction using child's current height, weight, and parents' heights. Best for children ages 4-17.
Height Converter
Convert height between different units: feet/inches, centimeters, and meters.
Predicted Adult Height
Height Range
Method Used
Mid-Parental Height Method
Genetics account for 60-80% of height. Nutrition, sleep, and health influence the remaining 20-40%.
Average Adult Height by Country and Gender
Compare predicted height against global averages from CDC and WHO population studies:
| Country/Region | Male Average | Female Average |
|---|---|---|
| United States | 5'9" (175 cm) | 5'4" (163 cm) |
| United Kingdom | 5'10" (178 cm) | 5'5" (164 cm) |
| India | 5'5" (165 cm) | 5'0" (152 cm) |
| Netherlands (Tallest) | 6'0" (183 cm) | 5'7" (170 cm) |
| China | 5'7" (171 cm) | 5'3" (160 cm) |
| Japan | 5'7" (172 cm) | 5'2" (158 cm) |
Related Calculators
Height Prediction Methods: Mid-Parental vs Khamis-Roche
The height calculator offers two scientifically validated methods for predicting adult stature. The mid-parental method provides quick estimates based on parental genetics, while the Khamis-Roche method incorporates the child's current growth pattern for more accurate predictions. According to research published in Pediatrics journal, the Khamis-Roche method has a median error of about 1.1 inches for Caucasian children ages 4-9.
Mid-Parental Height Formula Explained
For boys, the formula adds 5 inches (13 cm) to the parents' combined height before averaging: (Father's Height + Mother's Height + 5") / 2. For girls, subtract 5 inches: (Father's Height + Mother's Height - 5") / 2. According to the American Academy of Family Physicians, this method predicts height within ±4 inches in approximately 95% of cases.
Khamis-Roche Method: More Accurate for Ages 4-17
Developed by Khamis and Roche in 1994, this method uses the child's current height, weight, and parents' heights to predict adult stature without requiring bone age X-rays. It's most accurate for children between ages 4 and 9, with decreasing accuracy during and after puberty when growth spurts vary significantly between individuals.
What Factors Determine How Tall You Will Be?
Genetics account for 60-80% of your final height, but environmental factors can help you reach your full genetic potential. Understanding these factors is crucial during the growth years.
Growth Hormone and Sleep Quality
Human growth hormone (HGH) is primarily released during deep sleep. Children and adolescents need 9-11 hours of quality sleep for optimal development. Growth typically ends around age 15 for girls and 18 for boys. For tracking sleep patterns and fitness, our calorie calculator can help estimate energy needs.
Nutrition for Maximum Growth Potential
Protein provides essential amino acids for bone and muscle development. Calcium and Vitamin D support bone density, while zinc deficiency has been linked to growth delays. A balanced diet with fruits, vegetables, whole grains, and dairy products creates optimal conditions for growth.
How Can You Track Growth Over Time?
The CDC Growth Charts provide percentile curves that track height and weight development from birth through age 20. Pediatricians use these charts at regular checkups to identify potential growth issues early. A child who suddenly drops from the 75th to the 25th percentile may need evaluation, while gradual changes along established percentile curves are typically normal.
For body composition analysis involving height, try our BMI calculator or ideal weight calculator.
Last Updated: January 2026 | Reviewed for accuracy