Height Percentile Calculator

Your percentile depends on which room you are standing in

Most percentile tools compare you against one fixed population and hand you a number. This one asks which country to compare you against, and that turns out to be the most interesting thing about it.

Take a man of 178 cm. Against the Dutch, whose men average 181 cm, he is below average, somewhere around the 34th percentile. Move him to a country whose men average 170 cm and the same body becomes distinctly tall, up around the 86th. He has not changed. The room has.

That is not a flaw in the tool, it is the whole point of it. A percentile is a comparison and it is meaningless without saying compared to whom. And once you notice that the answer swings that hard depending on the reference group, the obvious question arrives: why are the averages so different?

The answer is one of the best stories in human biology, and the country at the top of your dropdown is the centre of it.

The Dutch grew 20 cm in 150 years

The Netherlands is the tallest country on earth. Dutch men average around 181 to 184 cm depending on whose survey you read, and Dutch women around 169 to 171. They have held that title since the generation born in the late 1950s.

Here is the part that stops people.

In the mid-18th century, Dutch military records put the average Dutch soldier at about 165 cm. They were not the tallest in Europe. They were among the shortest. Shorter than their neighbours, and shorter than Americans.

Over the following 150 years, the average Dutch man gained roughly 20 centimetres. Eight inches. It is the fastest documented height increase of any population in modern history. Over the same period the average American man gained about 6 cm.

Now do the arithmetic that makes this remarkable rather than merely interesting. One hundred and fifty years is roughly six generations. Gene pools do not change meaningfully in six generations. Researchers have actually tested how much selection would be required to produce that shift by breeding alone, and the answer is absurd: across each of six generations, only the tallest 37 percent of the population could reproduce, and the other 63 percent would have to have no children at all. That is not a description of the Netherlands. That is a description of a cattle programme.

So it was not genetics doing the heavy lifting. It was food, wealth, hygiene, healthcare, and crucially a society egalitarian enough that almost no child missed out during the years when growing happens. Dairy gets the headlines and probably deserves some of them. There is a plausible additional thread, from a study of some 94,500 Dutch records, suggesting taller men there had slightly more children, which over six generations compounds. But the effect is small and the researchers themselves call the evidence weak. The overwhelming share of that 20 cm was the environment finally letting people grow to the size they were always capable of.

And there is a coda that makes the point better than the story does. Since around 2001, Dutch heights have stopped rising. Flat. The most likely explanation is the simplest one: when a population gets everything it needs, it arrives at its ceiling and stops. You cannot feed a person taller than their genes will allow. You can only stop feeding them short.

So is height genetic or not?

This is where people get tangled, because two true statements sound like a contradiction.

Statement one: height is about 80 percent heritable. Our Child Height Percentile Calculator covers this, and it is solid: within a population, most of the variation between individuals traces to their genes rather than their circumstances.

Statement two: the Dutch gained 20 cm in six generations without their genes changing.

Both are true, and the resolution is a genuinely useful idea that people misuse constantly.

Heritability is not a statement about how much of your height came from your genes. It is a statement about what explains the differences between people in a particular population at a particular time. If everyone in a country is well fed, then nutrition is not what makes them differ from each other, because they all have plenty of it. All the remaining variation is genetic, and heritability comes out high. It comes out high because the environment is uniformly good, not despite it.

Which means high heritability tells you nothing whatsoever about what would happen if you changed the environment for everybody. Feed a whole population better and the entire distribution slides upward while heritability stays exactly where it was. That is the Dutch experiment, run for a century and a half.

So: within a room, height is mostly genes. Between rooms, and between centuries, it is mostly circumstances. Your percentile against your own country is largely telling you about your family. The difference between your country's average and someone else's is largely telling you about history.

Why the maths works: height is the textbook bell curve

The tool needs only two numbers about your country: the average height for your sex, and the standard deviation, which measures how spread out people are around that average. From those it can place you exactly.

It does that by working out your z-score, which is simply how many standard deviations you sit from the mean:

z = (your height − average height) ÷ standard deviation

For a 178 cm man against the Dutch average of 181 cm, with a standard deviation of about 7.42 cm:

z = (178 − 181) ÷ 7.42
z ≈ −0.40

He is four tenths of a standard deviation below average, which converts to roughly the 34th percentile.

This works because height is the closest thing biology has to a perfect normal distribution. It is the example every statistics textbook reaches for, and it is not a coincidence. Height is polygenic: thousands of gene variants each contribute a tiny amount, plus a mass of small environmental nudges. When a great many small independent effects add together, a bell curve is what you get, essentially by mathematical necessity. Human height is that principle made visible.

The practical consequence is that the tool does not need a lookup table of every possible height. Two numbers describe the whole population. That is why the custom option exists: give it any mean and standard deviation and it will place you against any group you like.

The tails are where it gets fun. A standard deviation of about 7.4 cm means someone 196 cm tall is two standard deviations above a 181 cm average, which puts them near the 98th percentile. Push to 203 cm and you are past the 99.8th. This is why exceptionally tall people are so rare: the bell curve does not taper politely, it collapses.

Two honest notes about this tool

It asks for your age and then ignores it. We would rather tell you than have you notice. The calculation uses your sex, your height and your country's adult average. Age never enters it, and the result box now says so. The field survives because the reference data behind this page is adult data: once you have stopped growing, your height percentile does not move with your age, so there is nothing for it to do.

Which is a shame, because age genuinely matters here, and for a reason that follows directly from the Dutch story. If populations have been getting taller, then younger people are taller than older people in the same country, and comparing a 25 year old against a national average that includes 80 year olds will flatter them. Comparing an 80 year old against the same average will not. Ideally a percentile like this would be against your birth cohort. This one is against everybody.

The standard deviations appear to be shared. Spot-check a few countries and you will find the same spread figures reused while only the averages change. This is a defensible simplification, since the spread of human height genuinely is similar across populations even where the averages differ a lot. It is worth knowing it is a simplification, though, especially since the tool lets you type your own.

The bigger limitation is the one every national average carries: countries are not homogeneous. A national mean is an average of everyone in a place, and real countries contain many ancestries. If your family came from somewhere other than where you live, the country dropdown is answering a question about your address rather than about you. The custom option is there for exactly that.

Questions people ask

Which country is tallest?

The Netherlands, and it has been since the generation born in the late 1950s. Dutch heights have been flat since about 2001, so the lead may have stopped growing.

Which country should I choose?

Whichever comparison you actually want. Where you live tells you how you compare to the people around you. Where your family is from may tell you more about your genes. Neither is the correct answer; they are different questions.

Can I still get taller?

Once your growth plates have closed, in the late teens for most people, no. Nothing sold on the internet changes this. During childhood, good nutrition, sleep and health let a child reach their potential, but they cannot exceed it.

What is an average height?

It depends entirely on where and when. Dutch men average around 181 cm today and averaged around 165 cm in the 18th century. There is no universal figure, which is rather the point of this page.

Can I use this for a child?

No. This compares against adult averages. Children are assessed against growth charts for their age and sex, so use our Child Height Percentile Calculator. To estimate a child's adult height from their parents, use our Height Calculator.

References

Where the figures come from. The 20 cm gain in Dutch male height over 150 years, against roughly 6 cm for American men over the same period, comes from military records as reported alongside the Royal Society's coverage of research into Dutch stature. The simulation showing how implausible natural selection alone would be as an explanation, requiring reproduction to be limited to the tallest 37 percent across six generations, was published in The History of the Family. The finding that Dutch heights have plateaued since around 2001 comes from Statistics Netherlands.

1. The Royal Society. Is natural selection making Dutch people the tallest worldwide? 2015. https://royalsociety.org/news/2015/04/is-natural-selection-making-dutch-tallest-in-the-world/
2. Simulating the evolution of height in the Netherlands in recent history. The History of the Family. 2023. https://www.tandfonline.com/doi/full/10.1080/1081602X.2023.2192193
3. World's tallest people may have peaked. NBC News, reporting Statistics Netherlands. https://www.nbcnews.com/health/health-news/world-s-tallest-people-may-have-peaked-flna1c9462938