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How To Calculate The IQ of a Person?

IQ Calculation

By IQ MetricsPublished 2 months ago 3 min read

IQ, or Intelligence Quotient, is a measure of a person's intellectual abilities. It is a multifaceted concept that encompasses various cognitive abilities, including reasoning, problem-solving, memory, and linguistic skills. Calculating a person's IQ involves taking a standardized test and interpreting the results based on statistical analysis. In this article, we will explore the process of calculating an IQ, including the factors involved and the significance of the results.

Understanding IQ Tests and Standardization

IQ tests are designed to measure an individual's cognitive abilities through a series of tasks and questions. These tests are carefully constructed and standardized to ensure reliability and validity. Standardization involves administering the test to a representative sample of the population and establishing a baseline for comparison.

The scores achieved on an IQ test are then interpreted by this standardized sample. The average IQ score is set at 100, and scores above or below this indicate levels of intelligence above or below the average. The distribution of scores follows a bell curve, with the majority of individuals falling within the average range.

Statistical Analysis and IQ Calculations

To calculate a person's IQ, their performance on an IQ test is compared to the performance of the standardized sample. This comparison is done using statistical methods, particularly the concept of standard deviation.

Standard deviation is a statistical measure that quantifies the variation or spread of scores within a distribution. In the context of IQ tests, the standard deviation is typically set at 15. This means that the scores within one standard deviation of the mean (100) range from 85 to 115, within two standard deviations from 70 to 130, and so on.

Using this knowledge, we can calculate a person's IQ based on their performance relative to the average. If a person's score falls one standard deviation above the mean, their IQ is 115. Similarly, a score of one standard deviation below the mean results in an IQ of 85. The further away from the mean, the higher or lower the IQ score.

Interpreting IQ Scores

IQ scores provide information about an individual's relative cognitive abilities compared to the general population. However, it is essential to remember that IQ is just one aspect of a person's overall intelligence, and it does not encompass other important factors such as creativity, emotional intelligence, or practical skills.

IQ scores are often categorized into various ranges to aid interpretation. Here is a general breakdown:

Extremely gifted: IQ above 140

Gifted: IQ between 130 and 140

Above average: IQ between 110 and 129

Average: IQ between 90 and 109

Below average: IQ between 70 and 89

Borderline intellectual functioning: IQ between 55 and 69

Intellectual disability: IQ below 55

It is crucial to note that a single IQ score should not be the sole basis for evaluating a person's abilities. IQ tests do not capture all forms of intelligence, and individuals may excel in some areas while struggling in others.

Limitations and Controversies

IQ tests have been the subject of debate and controversy due to various factors. Critics argue that these tests are culturally biased, as they may favour individuals from specific socio-cultural backgrounds. Additionally, IQ scores may not necessarily predict success or achievement in real-world situations accurately.

The interpretation of IQ scores can also be influenced by factors such as test anxiety, motivation, and prior experience with similar tests. These limitations highlight the importance of considering multiple sources of information when assessing a person's abilities.


Calculating a person's IQ involves administering a standardized test and comparing their performance to a representative sample. Statistical analysis, particularly using standard deviation, allows us to interpret the scores and assign an IQ value.

IQ scores provide insight into an individual's relative cognitive abilities but should not be taken as the sole measure of intelligence. It is essential to recognize the limitations and controversies surrounding IQ tests and consider them in conjunction with other factors when assessing a person's abilities.

Understanding IQ tests and their interpretation can lead to a more informed understanding of human intelligence and contribute to fairer evaluations of individuals' intellectual capabilities.


About the Creator

IQ Metrics is a comprehensive platform offering insightful resources on IQ testing, assessments, and understanding intelligence metrics.

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Comments (2)

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  • LASZLO SLEZAK2 months ago

    Good work. I liked it.

  • Jennifer watson2 months ago

    Thanks for posting this info. I just want to let you know that I just check out your site and I find it very interesting and informative.

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