How tall will I be? Calculate it here.

Tall or nah is the world's most accurate height calculator because it is:

• The only height calculator powered by population statistics.
• The only height calculator powered by the CDC (Centers for Disease Control and Prevention) Growth Charts dataset—widely regarded as the most authoritative population height data ever collected, anywhere in the world.

Why population statistics matter

By the time you're old enough to use this calculator, the most accurate way to predict your adult height will be to project your current height into adulthood statistically, by comparing you against an entire population to determine your most likely growth trajectory.

And that is what Tall or nah does.

To do that, Tall or nah must first determine where your height currently ranks specific to your age and your biological sex. Tall or nah calculates this rank in the form of a percentile, which represents the percentage of your peers (people your age and biological sex) you are taller than.

By itself, this percentile is rather interesting, because it tells you how tall you are for your age and biological sex. And it does that strictly by comparison against your peers—it doesn't use arbitrary numbers to determine tallness.

The reason Tall or nah needs this percentile is because height percentiles tend to track consistently over time. That is, children who are taller than—for example—60.5% of their peers will most likely end up being taller than around 60.5% of their peers as adults. And so to predict that child's adult height, all we need to do is reverse calculate the height of that percentile among adults (in the same biological sex).

Why doesn't Tall or nah ask for the heights of my parents?

First and foremost, the genes that determine your height potential could have come from anyone in your family tree, not just your parents—they could have come from a number of relatives over a number of generations.

Second, by the time you are old enough to use Tall or nah, your genetic height potential has had enough time to express itself that we can begin making statistical predictions about the trajectory of your height with a relatively high degree of accuracy. And the older you get, the more accurate this prediction will become. By your teenage years, this prediction will be remarkably accurate.

What is the minimum age I can calculate?

Because Tall or nah is powered by CDC Growth Chart data, the minimum age you can begin to statistically predict adult height is 2 years old. And again, the older you are, the more accurate your projection will be.

How much wiggle room is there in my height prediction?

Your adult height is—or will be—a combination of two things:

• Your genetic height potential—which you can't change
• Key environmental factors—many of which you can change

That is the height game in a nutshell.

The height projection that Tall or nah calculates for you is, more technically, the median of your height potential—the middle value of the assumed upper and lower limits of your genetic height potential's range.

Therefore, since Tall or nah is trained on the United States population, if you live the average American lifestyle, your projected height will most likely be your adult height, depending on how old you are when the projection is made.

However, if you fall severely short of the average American lifestyle, or if you maximize all of the environmental factors that influence height and exceed the average American lifestyle, you may be able to add or subtract a few inches to or from your projected height.

It is also important to note that nobody knows for certain how your height will ultimately play out. Population statistics are excellent at predicting most people's heights, not everyone's. In population statistics, there are always outliers. And it's possible that you may be one of them.

When will I stop growing?

If you're a biological male, look at the chart immediately below. This is the growth curve for biological males in the United States. You can see that by the age of 20, your final height is effectively final.

If you're a biological female, look at the chart immediately below. This is the growth curve for biological females in the United States. You can see that by the age of 16, your final height is effectively final.

The dark line in the middle is the mean average, meaning that 50% of the population is above that line, and 50% is below it. Tall or nah considers everyone above the line to be tall, and everyone else... nah.

Where can I learn more about height?

We have written the ultimate guide about human height—what it is, how it works, and how to maximize it. And it's completely free! You can read it here: Height Advantage: The Ultimate Guide to Unlocking Max Height.

Share it with everyone you know who is into height!

Ready to calculate your adult height?

Just click the button below! Tall or nah is completely free!