So, you wanna know how tall you really are? You got what it takes? Tall or nah is the world's most powerful height calculator—the results are undeniable. Don't believe me? Read this.

Still wanna do it? You got guts—I like that. Enter your information below and find out if you're actually tall—taller than over 50% of your peers.

First, how tall are you? We added half-inches, don't worry. Every inch counts—am I right?

What's your biological sex? I can't use your gender here, nothing personal.

What year were you born? The minimum age this calculator can handle is 2. Yeah, that young. These maniacs measured everyone—except me, of course, that's my business.

Finally, what month were you born? I'll need to compare you to people who are exactly the same age as you—in months, not years.

Okay, pal. Hit that button when you're ready. Good luck!

What is Tall or nah?

Tall or nah is a height calculator that will tell you:

if you're tall
how many people you're taller than
the tallest you'll ever be

What is considered tall?

Contrary to what you may think, "tall" is not what girls on TikTok say it is—it's not an arbitrary number, or a vibe. Tall is a mathematical construct, the statistical divider above the median. In reality, "tall" is being taller than over 50% of your peers—the people who are the same age and biological sex as you.

How accurate is Tall or nah?

The data that powers Tall or nah is staggeringly accurate.

Every calculation that you make on Tall or nah is powered by a monumental dataset, the culmination of a 19-year, multi-million dollar survey that measured the heights of tens of thousands of people across every major racial and ethnic group in America from infancy to adulthood.

The study, which spanned four consecutive decades, was one of the most comprehensive healthcare studies ever performed anywhere in the world. The collaborative efforts to collect and interpret this data were monumental achievements not only in public health science but in statistical science.

The dataset that resulted—that Tall or nah is powered by—is so impressive, in fact, that it has become the canonical reference for the United States government—for the Centers for Disease Control and Prevention and the National Center for Health Statistics—regarding the heights of its citizens.

If Tall or nah says you're tall, you're tall—and if it says nah, it's nah.

How do I use the Tall or nah calculator?

To use the Tall or nah calculator, simply input your current height into the speech bubble asking you how tall you are. A new speech bubble will appear asking you what your biological sex is—input your biological sex. Another speech bubble will appear asking you what year you were born—input your birth year.

If your birth year is within the last 21 years, a final speech bubble will appear asking you what month you were born—input your birth month. For people who still may be growing—born within the last 21 years—your age must be computed in months, not years. If you were born more than 21 years ago, your age does not need to be refined further.

Once the calculator has all of your information, the "Tall or nah" button will appear. Hit that button, and Tall or nah will compute and display your results.

What is the minimum age Tall or nah can calculate?

The minimum age Tall or nah can calculate is 2 years old. You read that correctly. Tall or nah can accurately compute whether a 2-year old is tall or nah for their age. The amount of data that powers Tall or nah is ludicrous.

What is the maximum age Tall or nah can calculate?

There is no age above 2 that Tall or nah can't calculate. Once your height has stopped increasing, which is around the age of 21 for both biological sexes (females a little earlier), your height is compared against all people in your biological sex 21 and older.

What does the percentage score mean?

When you make a calculation on Tall or nah, your result will include a percentage score. This score is the percentage of people you are taller than who are the same age and biological sex as you.

This percentage is more commonly known as a percentile in statistics. If your score is 75%, for example, you are in the 75th percentile among your peers—you are taller than 75% of your same-age and same-sex peers.

How can Tall or nah predict my max height?

A neat feature of Tall or nah is its ability to predict your max height as an adult. This prediction is, of course, a statistical guess, but on average a very good one. While individual growth patterns can and do vary, population data shows that height percentiles tend to track consistently over time. That is, children who are tall for their age are likely to remain tall into adulthood, and the same goes for those who are shorter.

Therefore, if we assume that you won't undergo any abnormal spurts or delays in your growth before reaching adulthood, we can use your current height percentile (as a non-adult) to reverse calculate your height among adults in that same percentile, effectively predicting your max height.

Does Tall or nah use AI?

No, Tall or nah does not use AI (artificial intelligence) in any way. Every calculation made by Tall or nah is performed using advanced statistical methods on actual human data. Tall or nah is a height calculator in the truest sense.

How does Tall or nah work?

In the most technical sense, Tall or nah is a statistical LMS calculator. LMS stands for lambda (λ), mu (μ), and sigma (σ)—parameters used in statistical modeling to describe the distribution of data, like height across age and sex. This methodology is widely used in population-based statistics because it produces accurate percentiles, z-scores (standard deviations from the median), and smooth growth curves, even when the data is not normally distributed.

As an LMS calculator, Tall or nah takes your height, age, and sex and compares them to a massive population dataset using LMS values that determine your place in the height distribution curve for your specific age and sex group. An LMS calculator, however, is only as reliable as the data it’s built on. And Tall or nah is built on, arguably, the most impressive dataset in the world regarding population height.

If you still have no idea how Tall or nah works, you're not alone—the math behind it is relatively advanced.

Does Tall or nah work outside the United States?

You can obviously use Tall or nah anywhere in the world, but the meaning of the results will vary depending on which country you live in. This is because the data that powers Tall or nah is, at the moment, limited to the United States. Therefore, your results will always be relative to the heights of people in the United States.

This limitation, however, doesn't make the calculator useless if you live outside the United States because statistics can be inferred, and the general shape of the height distribution curve is similar across most human populations. The challenge is knowing which way to shift the curve, and by how much, because the average height and the range of heights can differ significantly between countries.

For example, countries in Northern and Western Europe consistently have some of the tallest populations, with average adult male heights often around 6 feet or more. In contrast, many countries in Southeast Asia and parts of Africa have significantly shorter average heights. The United States falls somewhere in the middle—having notably fallen in global rankings from being among the tallest historically.

Therefore, using Tall or nah outside the United States still offers a useful sense of how your height compares to other people—just remember that what ultimately counts as "tall" and "nah" can vary by country. As more international data becomes available, Tall or nah will expand its coverage to provide more accurate, region-specific results.