IQ test for adults

What adult IQ scores compare you with

An adult IQ score is not a count of right answers. Modern tests report a deviation IQ: your performance is compared with a large sample of people your own age, and scaled so that the mean for each age group is 100 and the standard deviation is 15 (Wikipedia: Intelligence quotient). A 30-year-old and a 70-year-old who both score 100 are each exactly average for their age, even if they answered different numbers of questions correctly.

On that scale, about 68% of people score between 85 and 115, about 95% between 70 and 130, and about 99.7% between 55 and 145 (the 68-95-99.7 rule). The IQ score chart gives the percentile for every score in that range.

Age and ability: what changes and what does not

Different abilities peak at different ages. Research has found that processing speed and some reasoning measures peak in the late teens and twenties, while vocabulary and accumulated knowledge keep rising into the sixties (Hartshorne & Germine, 2015) (Salthouse, 2009). So a timed puzzle test like this one leans on abilities that typically peak early, while a vocabulary test leans on abilities that keep growing.

That is exactly why IQ is age-normed. Because the score is relative to same-age peers, a typical decline in raw speed with age does not lower your IQ by itself. If you are 55 and find the 30-second clock tighter than you would have at 25, that is expected, and it is what the age norms on a clinical test account for. A ten-question practice set has no such norms, which is one more reason its score is not an IQ.

The puzzles in this set

The set samples every format used in the full IQ Octopus test, easy to hard:

• Sequences (two): name the change from tile to tile and apply it once more.
• 3x3 matrices (three): find the rules across rows and columns and fill the gap.
• Number series (two): write the gaps; if they are messy, read every other number.
• Mental rotation (one): find the turned figure, not the mirror image.
• Odd one out (one): ignore size and fill; count sides or check where the dot sits.
• Figure analogy (one): A is to B as C is to which tile?

Tips for adults coming back to tests

If it has been a while since you sat a timed test, the format can feel more foreign than the puzzles. A few things make a real difference:

• Read the prompt above each puzzle. It tells you the format, and the format tells you the first move.
• Describe before you choose. Say the rule and the missing tile in words, then look at the options. Wrong options are each one detail away from right.
• Do not fight the clock on one item. When the 30-second ring empties, the question counts as unanswered and the next one loads. Let it go; the next one may be easier.
• Pick a calm moment. A quiet room, a full screen rather than a phone if you have one, and no interruptions. Distraction costs more points than any single trick gains.

What your practice score means

At the end you see a count out of ten and a plain description of that practice performance. It is not an IQ, it is not adjusted for age, and it is not a diagnosis of anything. If the result surprises you, low or high, remember it rests on ten items on one day. Even full clinical scores carry measurement error, and manuals report a confidence interval, often around plus or minus 5 points at 95%, rather than a single exact value (Wechsler, 2008). Ten items carry far more uncertainty than that.

Practice and retaking

Retaking a test raises scores, mostly through familiarity: across many studies, about a quarter of a standard deviation on average, roughly 4 IQ points, and more when the same form is reused (Hausknecht et al., 2007). If you plan to take a longer test, a practice set first is reasonable. Taking the same practice set over and over mostly measures your memory of it.

What an adult IQ score can and cannot tell you

Across large groups, IQ is linked to real outcomes. A 2007 meta-analysis reported correlations of intelligence with education of about 0.56, with occupational level about 0.45, and with income about 0.23 (Strenze, 2007). Those are tendencies across many people, and the spread around them is wide. By the time you are an adult, your own record of work, learning and choices says far more about you than any single test score, which describes one kind of reasoning on one day.

Used well, an adult IQ estimate is a point of curiosity and self-knowledge: how your reasoning compares on a common scale, and which kinds of puzzles come more easily. Used badly, it becomes a label. We would rather you treat it as the first kind of thing.

Getting an estimated IQ as an adult

For a personal estimate, the full IQ Octopus test has 25 puzzles in five sections and takes about 12 minutes for most people. It reports an estimated IQ on the standard scale with a percentile and a confidence range. It is not a clinical instrument. If you need a score for a diagnosis, an accommodation or an admission decision, a licensed psychologist can give a full standardized assessment such as the Wechsler Adult Intelligence Scale, first introduced as the Wechsler-Bellevue in 1939, with WAIS-5 published in 2024 (Wikipedia: WAIS).

To understand your result once you have it, read how to read an IQ score, and for more on aging, the guide to IQ and age.