IQ Percentile Calculator

Enter your IQ score to calculate which percentile it falls in.

How to Calculate Your IQ Percentile

IQ, short for intelligence quotient, is a number or score representing a person’s reasoning ability. IQ is measured using a set of standardized tests to measure a person’s ability to solve problems.

A person’s IQ score is a number used to measure human intelligence. While the vast majority of people fall in the range of 60 to 140, 68% of people have an IQ in the range of 85 to 115, as shown in the distribution chart above.

What is the IQ Scale?

There are several IQ scales that classify an IQ score with varying levels of cognitive ability, but the two most widely used today are the Stanford-Binet and Wechsler Intelligence Scales.[1]

Some other less commonly used scales are the Woodcock-Johnson, Kaufman, Cognitive Assessment System, Differential Ability Scales, and Reynolds Intellectual Ability Scales.

Stanford-Binet Intelligence Scale

The IQ scale below shows the classification of IQ scores using the Stanford-Binet fifth edition intelligence scale.[2]

Stanford–Binet fifth edition (SB5) intelligence scale IQ range classifications
IQ Range IQ Classification
145–160 Very gifted or highly advanced
130–144 Gifted or very advanced
120–129 Superior
110–119 High average
90–109 Average
80-89 Low average
70-79 Borderline impaired or delayed
55–69 Mildly impaired or delayed
40–54 Moderately impaired or delayed

Wechsler Adult Intelligence Scale

The IQ scale below shows the classification of IQ scores using the current Wechsler Adult Intelligence Scale.[3] More value-neutral terminology is also included with the reference.[4]

Wechsler adult intelligence scale IV IQ range classifications
IQ Range IQ Classification Value-Neutral Term
130+ Very superior Upper extreme
120-129 Superior Well above average
110-119 High average High average
90-109 Average Average
80-89 Low average Low average
70-79 Borderline Well below average
69 and below Extremely low Lower extreme

What is a High IQ?

So, what is a high IQ score then? Well, that’s all relative!

The Stanford-Binet and Wechsler intelligence scales indicate that an IQ over 130 is in the upper bound of IQs, which is in the top 2% of scores.

Mensa, the high IQ society, requires an IQ of 130-132 (depending on the test) to be eligible to join.[5]

While there is no theoretical maximum score, an IQ of over 180 is profoundly rare. There are conflicting claims of who has the highest ever recorded IQ score, but Ainan Celeste Cawley certainly is at or near the top of that list with an IQ of 268.[6]

What is an Average IQ?

IQ tests are regularly updated to reflect a score of 100 as the average score. As stated above, most people (~68%) have an IQ between 85 and 115.

Take an IQ Test

So, you’re probably itching to know how to find your IQ score by now. The best way to do that is to take a test.

There are several standardized tests available; the most common are:[7]

  • Stanford-Binet Intelligence Scale
  • Universal Nonverbal Intelligence
  • Differential Ability Scales
  • Peabody Individual Achievement Test
  • Wechsler Individual Achievement Test
  • Wechsler Adult Intelligence Scale
  • Woodcock Johnson III Tests of Cognitive Disabilities

IQ tests measure a person’s logic, spatial awareness, verbal reasoning, and visual abilities. Since intelligence tests do not measure knowledge on subject-matter, they are not something you can or should study for.

Find Your IQ Percentile

Once you have found your IQ score, you might want to know how you compare to the rest of the population? To do that, you can determine what percentile the score is in.

The percentile is the percentage of people with an equal or lower score.

IQ scores follow a standard bell curve. The curve is distributed using standard deviations from the mean.

Standard deviation is a measure of variability in a population. When calculating percentiles for IQ scores, a standard deviation of 15 is used.

You can use the chart below to see which percentile your score is in, and of course, the calculator above will calculate the most precise percentile.

IQ Percentile Chart

The chart below shows the range of IQ scores from 10 to 200 and their percentiles.

Chart showing IQ scores from 10 to 200 and the percentile of the population with an IQ score below that value using a standard deviation of 15
IQ Score Percentile
10 0.000000099
20 0.000005
30 0.0002
40 0.003
50 0.04
60 0.4
70 2
80 9
90 25
100 50
110 75
120 91
130 98
140 99.6
150 99.96
160 99.996
170 99.9998
180 99.999995
190 99.9999999
200 99.9999999987

References

  1. Silverman W, Miezejeski C, Ryan R, Zigman W, Krinsky-McHale S, Urv T., Stanford-Binet & WAIS IQ Differences and Their Implications for Adults with Intellectual Disability (aka Mental Retardation), Intelligence, 2010, 38(2), 242-248. https://doi.org/10.1016/j.intell.2009.12.005
  2. Kaufman, Alan S., IQ Testing 101, New York: Springer Publishing, 2009, 39.
  3. Wechsler D., Wechsler adult intelligence scale | Fourth Edition, San Antonio, TX: Pearson, 2008, all.
  4. Groth-Marnat, G., & Wright, A. J., Handbook of psychological assessment (6th ed.), Hoboken: Wiley, 2016, 136.
  5. Mensa, Qualifying test scores, https://www.us.mensa.org/join/testscores/qualifying-test-scores/
  6. Ramos, J., Here Is The Highest Possible IQ And The People Who Hold The World Record, Science Trends, 2017, https://sciencetrends.com/highest-possible-iq-people-hold-world-record/
  7. Cherney, K., IQ Testing, Healthline, 2017, https://www.healthline.com/health/iq-testing