Height Percentile Calculator

Introduction

This height percentile calculator shows you how your height compares to other people of the same age and sex. Enter your height, age, and biological sex, and the tool instantly tells you what percent of people you are taller than. It uses data from the WHO, the CDC and the NCD Risk Factor Collaboration to give you accurate results for children, teens, and adults.

Your result includes a percentile ranking, a Z-score, a bell curve chart, and a step-by-step breakdown of how the math works. You can compare against populations from over 100 countries. Whether you want to check your child's growth with our baby percentile calculator or see where you stand among adults, this calculator makes it quick and simple.

How to Use Our Height Percentile Calculator

Enter a few details about yourself below, and the calculator will show your height percentile, Z-score, and how you compare to others in your age and sex group.

Biological Sex: Pick either Male or Female. Each sex has its own height data, so this helps the tool give you an accurate result.

Age: Choose your age in years from the dropdown. For a baby, child or teen, also choose the months (and, for a young baby, the days) for a more precise result.

Height: Switch between Imperial (feet and inches) or Metric (cm or m), then type in your height. The tool will convert it for you automatically.

Compare Against Population: Pick the country you want to compare yourself to. You can type in the search box to find a country fast. For babies (0–24 months), WHO world data is used. For kids aged 2–17, U.S. CDC data is used.

Reference Average Height & Standard Deviation: These fields auto-fill based on the country and age you pick. They show the average height and spread for that group. You can edit them if you have your own data.

Calculate & Reset: Click Calculate to see your results. Click Reset to clear all fields and start over.

What Is a Height Percentile?

A height percentile tells you how your height compares to other people of the same sex and age. If you are in the 75th percentile, that means you are taller than 75 out of every 100 people in your group. If you are in the 25th percentile, 75 out of 100 people are taller than you.

How Height Percentile Is Calculated

This calculator uses a math formula called the Z-score. It measures how far your height is from the average. First, it subtracts the average height from your height. Then it divides that number by the standard deviation, which shows how spread out heights are in a population. A Z-score of 0 means you are exactly average. A positive Z-score means you are taller than average. A negative Z-score means you are shorter than average.

The Z-score is then converted into a percentile using a standard bell curve (also called a normal distribution). Most people fall near the middle of this curve, and fewer people are found at the very tall or very short ends.

Where the Data Comes From

The reference data in this calculator comes from published health sources. For babies it uses the WHO Child Growth Standards.¹ For U.S. children aged 2 and older it uses the CDC growth charts for stature, by sex and age in months.³ For U.S. adults it uses the measured heights in the U.S. anthropometric reference tables for 2015 to 2018, by sex and age group.² For each U.S. adult age group, the standard deviation is the one whose bell curve best matches the published percentiles. The calculator uses the WHO standards up to 24 months and the CDC charts from 2 to 19 years, and from 18 years on you can compare against other countries. For adults in other countries it uses the NCD Risk Factor Collaboration's estimates of mean adult height for people born in 1996, by sex.⁴ Each country's figure is the mean height in cm for the latest year of birth in the collaboration's country data file.⁵

Why Height Percentile Matters

Doctors use height percentiles to track growth in children and spot potential health issues early. A child who suddenly drops or jumps several percentiles may need a closer look. For adults, knowing your height percentile helps you understand where you stand compared to others in your country or worldwide. It is a simple, useful body metric that puts your height into context.

Important Things to Know

Height depends on many factors, including genetics, nutrition, and overall health. A single percentile number does not tell you whether you are healthy or unhealthy. This calculator gives a statistical comparison, not a medical diagnosis. If you have concerns about your height or your child's growth, talk to a doctor.

Formulas used

Z-Score

z = \frac{x - \mu}{\sigma}

Percentile (Normal CDF)

P = \Phi(z) \times 100 = \frac{1}{2}\left(1 + \operatorname{erf}\!\left(\frac{z}{\sqrt{2}}\right)\right) \times 100

Taller-than-you ratio

R_{\text{taller}} = \frac{1}{1 - \Phi(z)}

Shorter-than-you ratio

R_{\text{shorter}} = \frac{1}{\Phi(z)}

Imperial to metric height conversion

h_{\text{cm}} = (\text{ft} \times 12 + \text{in}) \times 2.54

Frequently asked questions

What does my height percentile number mean?

Your height percentile tells you how many people out of 100 you are taller than. If the calculator says you are in the 80th percentile, you are taller than 80 out of 100 people of the same age and sex. The 50th percentile means you are exactly in the middle.

What is a normal height percentile?

Percentiles between the 5th and 95th are usually treated as the typical range, and half of all people fall between the 25th and 75th percentile by definition. Being outside this range does not mean something is wrong. It just means your height is less common in your group.

What is a Z-score in the height percentile results?

A Z-score shows how many standard deviations your height is from the average. A Z-score of 0 means you are exactly average. A Z-score of +1 means you are one standard deviation taller than average. A Z-score of -1 means you are one standard deviation shorter.

What does the 1 in X ratio mean?

This ratio tells you how common your height is. If the result says "1 in 10 people are taller than you," it means that for every 10 people in your group, about 1 would be taller. A higher number means your height is more rare.

Does height percentile change with age?

Yes. Children's percentiles can shift as they grow because kids grow at different rates. A child in the 60th percentile at age 5 might be in the 70th percentile at age 10. For adults, height percentile usually stays stable unless the reference population changes.

Why is my height percentile different in different countries?

Average heights vary by country. A man in the 70th percentile in the United States would be below the 40th percentile in the Netherlands, where people tend to be taller. The country you choose changes the average and standard deviation used in the calculation.

What height percentile is considered tall?

A percentile above the 84th is often called "above average" or "tall." This means you are taller than about 5 out of 6 people. A percentile above the 98th is considered very tall, meaning only about 2 in 100 people are taller than you.

What height percentile is considered short?

A percentile below the 16th is often called "below average" or "short." A percentile below the 2nd means you are shorter than 98 out of 100 people in your group. Doctors sometimes look more closely at children below the 5th percentile.

Should I worry if my child is in a low or high percentile?

Not necessarily. What matters most is that a child follows a steady growth pattern over time. A sudden jump or drop across several percentiles is more important than any single number. Talk to your child's doctor if you have concerns about their growth.

Can two people with the same height have different percentiles?

Yes. A 5'9" man and a 5'9" woman will have very different percentiles because the average height for men is higher than for women. Age and country also affect the result. The same height can land in different percentiles depending on the comparison group.

What does the standard deviation number mean?

Standard deviation measures how spread out heights are in a group. A small standard deviation means most people are close to the average. A large one means heights vary more widely. The calculator uses it along with the average to figure out your percentile.

Sources

Child growth standards. World Health Organization. Accessed September 4, 2026.

Fryar CD, Carroll MD, Gu Q, Afful J, Ogden CL. Anthropometric Reference Data for Children and Adults: United States, 2015-2018. Vital and Health Statistics. National Center for Health Statistics. 2021;Series 3, Number 46. Accessed September 4, 2026.

CDC Growth Charts Data Files. National Center for Health Statistics, Centers for Disease Control and Prevention. 2000;Stature-for-age charts, 2 to 20 years (statage). Accessed October 13, 2026.

NCD Risk Factor Collaboration (NCD-RisC). A century of trends in adult human height. eLife. 2016;5:e13410. doi:10.7554/eLife.13410. Accessed October 13, 2026.

Height: country-specific mean height at age 18 by year of birth, 1896-1996 (eLife 2016 estimates). NCD Risk Factor Collaboration (NCD-RisC). 2016;NCD_RisC_eLife_2016_height_age18_countries.csv. Accessed October 13, 2026.

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