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
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)
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
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
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.