IQ Percentile Calculator

- May 10, 2025
| |

Calculate the percentile rank of an IQ score based on standard IQ test distributions. This calculator helps interpret what an IQ score means in terms of population percentile.

Enter IQ Score Information

Advanced Options

About IQ Scores and Percentiles

IQ (Intelligence Quotient) scores are standardised test scores designed to assess human intelligence. Most modern IQ tests are constructed so the average (mean) score is 100, with a standard deviation of 15.

The Normal Distribution

IQ scores follow a normal distribution, also known as a bell curve. In this distribution:

  • Approximately 68% of the population scores between 85 and 115 (within 1 standard deviation of the mean)
  • Approximately 95% of the population scores between 70 and 130 (within 2 standard deviations)
  • Approximately 99.7% of the population scores between 55 and 145 (within 3 standard deviations)
Percentiles vs. IQ Scores

A percentile rank indicates the percentage of people who score at or below a given score. For example:

  • An IQ of 100 corresponds to the 50th percentile (exactly average)
  • An IQ of 115 corresponds to the 84th percentile (better than 84% of people)
  • An IQ of 85 corresponds to the 16th percentile (better than 16% of people)
Common IQ Tests
  • Wechsler Intelligence Scales (WAIS, WISC): Mean = 100, SD = 15
  • Stanford-Binet Intelligence Scales: Mean = 100, SD = 15
  • Raven's Progressive Matrices: Mean = 100, SD = 15

While most modern tests use the same statistical parameters, interpretation guidelines may vary between tests.

Limitations

It's important to understand that:

  • IQ is just one measure of cognitive ability and doesn't capture all aspects of intelligence
  • Test results can be affected by factors like test anxiety, cultural bias, and environmental factors
  • IQ scores should be interpreted by qualified professionals, especially for clinical or educational purposes
  • This calculator provides statistical information only and is not a substitute for professional assessment

Understanding the IQ Percentile Calculator

The IQ Percentile Calculator is a handy tool that helps you understand how your IQ score compares to the wider population. It calculates the percentile rank of your IQ score, showing you where you stand in relation to others. This is particularly useful for anyone looking to interpret their IQ results more effectively.

What Does Percentile Mean?

Percentiles give a simple way to understand your score. They tell you the percentage of people who scored below you. For example, if you're at the 70th percentile, that means you scored better than 70% of the people who took the same test. Here’s a quick breakdown of how percentiles work:

  • 50th percentile means you are average.
  • 84th percentile indicates you are better than 84% of test-takers.
  • 16th percentile shows you performed better than just 16% of people.

Getting Started with the Calculator

Using the IQ Percentile Calculator is straightforward. You start by entering your IQ score, which usually ranges from 40 to 200. You also need to select the type of IQ test you took, such as the Wechsler or Stanford-Binet tests. These tests have standard distributions that the calculator uses to compute your percentile rank.

Customising Your Inputs

If you have a unique IQ test or specific statistical data, the calculator allows for custom inputs. You can set your own mean and standard deviation values. This is particularly useful if your test has a different scoring system than the common ones.

Advanced Options for Detailed Results

The calculator offers advanced options, too. You can choose how many decimal places you want in the results and whether to show statistical details. This information can provide deeper insights into your score, such as how rare your performance is compared to the general population.

Visualising Your Results

One of the standout features of the IQ Percentile Calculator is its visual representation of your results. It includes a bell curve graph, allowing you to see your IQ score's position relative to the average. This visualisation makes it easy to grasp how your IQ score fits into the broader context of intelligence distribution.

Understanding Your Statistical Details

The calculator not only tells you your percentile rank but also provides statistical details about your score. You'll learn how your score relates to the mean, how many people are above or below your score, and how many standard deviations you are from the average. This information lets you fully grasp the significance of your IQ score.

IQ Scores and Their Impact

IQ scores are a common measure of intelligence, calculated using standard tests. Most modern tests average around 100 with a standard deviation of 15. Understanding your IQ percentile can help in many areas, such as educational planning or personal development. It's a tool that gives insight into cognitive ability and areas where you may excel.