Evaluation & results

  1. IQ Scores
  2. IQ level
  3. What is the average IQ?
  4. BGI™ IQ classification scale

IQ Scores

IQ Scores show a person’s performance in the test compared to all other people in the same age group who have taken the test.

Different tests have been developed as IQ research has progressed over the years, with each being given its own scoring system. Therefore, an IQ of 130 is rather meaningless unless you know the exact test that was used to measure your score.

In order to compare different IQ tests, their scores need to be converted into “percentiles”. For example, converting your IQ Score into a percentage will reveal how you compare to the rest of the population in percentage terms.

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IQ level

IQ test publishers use classification labels such as “exceptional” or “average” to define the different categories of IQ Scores.

There is no uniform way of labelling IQ levels, nor is there a consistent pattern of classifying IQ Scores into specific categories or with specific boundary scores.


What is the average IQ?

In most modern IQ tests, the average IQ Score is set at 100 with a standard deviation (SD) of 15, meaning that IQ Scores follow a normal distribution of statistical data.

In other words, about 95% of the world’s population have scores within two standard deviations (SD) of the mean (average IQ Score).

If one SD is 15 points, as is the norm in almost all modern tests, then 95% of the population are within the range 70-130, and 98% are below 131. Alternatively, two thirds of the population have IQ Scores within one SD of the mean, i.e. within the range 85-115.


BGI™ IQ classification scale

The BGI™-certified IQ test uses the following scale to classify your results:

IQ Score IQ classification
Above 144 Highly gifted
130 – 144 Gifted
115 – 129 High average
85 – 114 Average
70 – 84 Below average
Less than 70 Extremely low

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