The Girls' Growing Up in the Lord

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Predicting Your Adult Height

The Mid-Parent Rule focuses on your genetic potential. It uses less information, but it is also less accurate. Its overall accuracy is plus or minus 2.8 percent.

The Mid-Parent Rule

Your Father's Height:
Your Mother's Height:
Your Sex: Male Female

All measurements are in: inches centimeters

Your predicted height is but can be as low as or as high as when you reach your full height.


The Mid-Parent Rule focuses on your genetic potential. It uses less information, but it is also less accurate. This alternative is supposed to be accurate to within four inches (ten centimeters).

The Mid-Parent Rule (Alternative)

Your Father's Height:
Your Mother's Height:
Your Sex: Male Female

All measurements are in: inches centimeters

Your predicted height is but can be as low as or as high as when you reach your full height.


Another popular estimate is that boys tend to be twice their height at 24 months of age and girls tend to be twice their height at 18 months of age.

Double Infant Height

Your Height at 24 months for boys
or 18 months for girls:
Your Sex: Male Female

All measurements are in: inches centimeters

Your predicted height is when you reach your full height.


The KGH method of height prediction acknowledges the role that nutrition plays in your final height. Since there is no simple way of measuring how well you have been eating, the formula uses your current age, height, and weight to make an estimate. It can be off because it does not factor in how far you have currently developed, if you are a teenager.

I added an option to replace age with the Tanner Development Stage. Since this has not been tested with a study, it should be treated as experimental.

The KGH Method

Your Father's Height:

 ft.   in.

Your Mother's Height:

 ft.   in.

Your Sex:

Female      Male

Your Height:

 ft.   in.

Your Weight:

 lbs.

Estimate based on:

Your Age:

Your Tanner Stage:

Your predicted height is accurate to ±1.5 inches (4 cm)
Your estimated adult height is between and .


Prediction of Adult Height During Adolescence (For males and females aged 8 to 16)

This one uses your half-height to estimate your development progress. Accuracy is within 5.5 cm (2 inches) 95% of the time.