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 that uses the same data that powers the CDC (Centers for Disease Control and Prevention) Growth Charts—the most impressive data ever collected about population height anywhere in the world, that spanned four decades and cost the U.S. government millions of dollars.

If you think you can handle the truth, hit the button below and calculate your end height.

Why other height calculators fall short

Every height calculator you see online uses some variation of the mid-parental height formula, a rudimentary math equation that you can solve on a napkin that essentially just averages the height of your parents. This should only be relied on when you are a baby, when there is no better way to predict your end height.

Because once you're past toddlerhood, your growth pattern usually settles into a consistent percentile, making percentile tracking the stronger predictor. And that's how Tall or nah projects your adult height—percentile tracking. It takes the percentage of your peers you're taller than right now and tracks it into adulthood.

What's more, a person doesn't just inherit genes from their parents, they inherit them from multiple generations. Because of this, height can show up in surprising ways across generations, appearing to "skip" some entirely.

Tracking your height percentile is the superior method because by the age of just 2, your genetic profile has had enough time to express itself to allow statistical extrapolations to be made with relatively high degrees of accuracy.

If you're old enough to browse the web and read this article, the heights of your parents are virtually irrelevant.

What is a height percentile?

Your height percentile is the percentage of people you are taller than who are the same age and biological sex as you. Because of the variations in diet, lifestyle, and access to healthcare around the world, to get the most accurate result possible, your height percentile is only compared against people in the United States.

For example, if your height percentile is 80.4% (according to Tall or nah), then you are taller than 80.4% of people your age and biological sex, in the United States. And age is not measured in years, it is measured in weeks. To be annoyingly accurate with your percentile, the people who are considered your age are never more than a couple of weeks older or younger than you.

When you make a calculation on Tall or nah, your "height score" is your height percentile.

What is the minimum age I can calculate?

Because the people at the CDC don't mess around—at least when it comes to height—you can use Tall or nah to project the adult height of someone who is just 2 years old.

Obviously, the older the subject is, the more accurate the projection will be. If you're a teenager, for example, the projection is almost dead accurate. By your teenage years, your genetic profile has had so much time to express itself that the odds of a radical change in your growth trajectory at the final stretch is incredibly low.

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.

Can I change my adult height, or am I cooked?

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

• Your genetic height potential (which you can't change)
• Your lifestyle choices (which you can change)

That is the game of height, in a nutshell. The projected height you receive from the Tall or nah height calculator is the mean average (the middle value) of your genetic height potential. That is, if you live the average American life, your Tall or nah projected height will likely be your adult height.

However, if you maximize certain aspects of your lifestyle, then you have the potential to reach the upper limit of your genetic height potential, which may gain you a number of extra inches. Luckily for you, we've written the ultimate guide that outlines precisely how to do that.

If you want to unlock your maximum genetic height potential, read Height Advantage: The Ultimate Guide to Unlocking Max Height. It will not only tell you how to grow to your tallest, but it will answer probably every question you'll ever have about height itself.

And if you've ever played Fortnite, you know how important height advantage is.

So how do I use this thing?

Just click here, it's that easy.