Well, there's a clever equation doing the rounds that claims to have the answer!
The calculation was developed by researchers in the 1970s, but parents have picked it up again, and it's possible that this speedy bit of maths will serve you better than any height chart.
How do you work it out? The formula varies slightly between boys and girls, so here are the equations for both:
Height calculation for boysAdd together each parent’s height in cm, then divide that number by two. Add 6.5cm to the number. This number is the mid-parental height for boys. This number plus or minus 10cm is the range in which your son's height can reasonably be expected to fall.
Height calculation for girlsFor girls: Add together each parent’s height in cm, then divide that number by two. Divide that number by two. Subtract 6.5 cm from the number. This number is the mid-parental height for girls. This number plus or minus 10cm is the range in which your daughter’s height can reasonably be expected to fall.
Of course, these numbers aren't guaranteed to be 100% accurate - not all siblings born to the same parents will turn out to be the same height, which is often where the 10cm margin comes into play. However, many doctors use this calculation to give an idea of potential height to new parents, and scientists do say that genes account for around 70% of one's final height, so if you've worked the numbers out right, they should be a reasonable estimate.
And if you don't have a tape measure or don't fancy getting the calculator out? Our just-for-fun tool can also predict just how tall your kids could be when they're fully grown!