Your parents set a range — not a number. Answer 5 quick questions and find out where yours actually ends.
First — male or female?
Growth timing differs between the two, so the maths changes.
How old are you?
This decides how much natural growth you have left.
How tall are you right now?
Measure in the morning if you can — you're tallest then.
How tall are your parents?
This is the single biggest predictor of your range. Best guess is fine.
Last one — where do you live?
So we compare you against the right average.