How Accurate Are Online IQ Tests in Measuring Intelligence?

Yeah, that sounds right. The idea that some short test could measure the realness of your intelligence is pretty myth-like. And yet these tests keep getting taken over and over and over again. Millions of people take these tests online every year, and are given a number to tell them what their brain is like. So what good is this number?

The foundation problem with online testing

Most modern tests of intelligence, such as the Wechsler Adult Intelligence Scale (WAIS) and Stanford-Binet, include a large number of individual questions, which must be administered by a trained psychologist. Intelligence tests can therefore take anywhere from 30 minutes to several hours to complete, and are typically given in a specially adapted testing room. Modern versions of the test are composed of a number of individual subtests, each covering a different aspect of intelligence, including verbal reasoning, visual processing, memory and processing speed.

Online tests face an immediate structural challenge.

What ends up being reduced and condensed into a single testing platform (a psychometric test that includes some elements of visual-spatial skills and maths) is what psychologists call a “construct under-representation”. In other words, most of real intelligence is left out, and what is left cannot be fully captured within a browser window.

What the research actually shows about digital assessments

Many studies validated statements of online companies by comparing them with real psychological assessment tools. These studies usually compare scores from the online test to scores from a full clinical evaluation by a real psychologist. In 2019, the Journal of Applied Psychology published a study titled ” Can you trust your online cognitive abilities test results? “which compared correlations of various online tests to the real full-scale clinical evaluation with a psychologist. The correlations varied from 0.3 up to 0.7 when compared with the real IQ score of the person evaluated by the psychologist.

Hardly. The correlations suggest that the online tests explained between 9% and 49% of the real IQ score variance.

Things get even more complicated when we try to get some kind of estimate of the validity of different kinds of tests. One way to estimate validity is by comparing scores on a test to scores on a formal evaluation of intelligence given by a psychologist. One example of this comes from a test developed by a team of psychologists. They found that the test that gave the most reliable and valid scores was the longest one that included a wide variety of cognitive tasks. Remember that just about all of the online “IQ tests” that give you a quick score are nothing more than games, and not real evaluations of your IQ. Good online IQ test sites will have a large number of different kinds of cognitive tests and will take at least 45-60 minutes to complete. Keep in mind, though, that even the best online IQ test is limited by the fact that it is computer-based.

The truth is that these types of assessments do not measure: Test anxiety, Technical issues that occur while taking the test, Environmental distractions, or student motivation. These are just a few of the variables that can heavily impact a student’s score. Computer-based testing creates a measurement gap. No matter how good the test is designed to be, it will never be able to capture all the variables of what students know and are able to do.

The standardisation challenge

Intelligence Quota testing is a highly standardised test. Thousands of people of all ages and backgrounds are tested every year in order to build up averages of performance for individuals of different ages. This can then be compared to the individual’s own performance in order to assess their relative level of ability. Online tests are not even close to being as well standardised as this.

According to most scoring systems, a score of 128 is in the gifted range. But who was the population that you scored this in relation to? Practically all online tests are scored relative to the people who happen to take the test on the computer. And online test takers are almost always drawn from some self-selected group, which is likely to be quite different from the population one is interested in comparing themselves to.

Cultural and linguistic barriers

Cultural bias has been a concern in the field of intelligence testing for many years. Unfortunately, this same concern is present in online testing and has not yet been addressed. Many online tests try to assess your cognitive abilities through the medium of interactive puzzles and games. As with any question, they tend to favour those with more education and a more varied lifestyle. There is also a large amount of cultural bias in language-based questions that are not easily understood by non-English speakers. Another major concern with online testing is the restrictive time limits that are present. Children, as well as elderly people, as well as people with atypical processing styles, often make the same mistakes at the same stage of the test, which results in their test scores being non-interpretable.

On-line tests sites occasionally describe their tests as “culture fair”, but none have yet succeeded in eliminating cultural influence.

When online tests might actually be useful

I do not place a lot of importance on the results of online tests, but they can serve as a starting point and screening tool, or at the very least give some idea of a person’s overall cognitive level, again with the understanding that the results are highly arbitrary. They can also give some idea of how one’s cognitive abilities stack up in specific areas such as memory, math, logic, or spatial reasoning, keeping in mind that while the results will be completely without merit in terms of real-world application, they may still provide some insight into relative performance in these areas.

As I mentioned in a recent post, educational researchers have recently identified a third application for digital cognitive assessments. It turns out that such assessments are also well-suited for large-scale studies designed to investigate population trends as opposed to making precise measurements on individual subjects.

Making sense of your results

Now there are online tests which give you your ‘real’ IQ. As if such a thing existed! Be cautious and bear in mind the following: If your score is substantially higher than expected, it could be because of the following factors: You were fortunate with the conditions in which you took the test; The test capitalized on your areas of strength; If your score is a long way below what you thought it would be, it could be for the following reasons: There was a problem with the test itself; You took the test on a bad day, when you were not feeling your best.

Especially as platforms like TechPount’s clarity-driven learning approach continue highlighting how easily digital tools can oversimplify complex human abilities.

A large number of websites offer the opportunity to carry out an online IQ test, which enables users to obtain their score in a matter of minutes. It is important to bear in mind that an online test should not be considered the sole criterion for assessing one’s intelligence. Intelligence is a highly complex and multifaceted phenomenon that cannot be fully captured by any test, whether it is online or in person. The essential question is whether we should give any importance at all to the results obtained from an online test.

The answer appears to be: some, but not much.