IQ Test for 15 Year Olds

A 15 year old can take this IQ test in about 12 minutes: 25 visual puzzles, no sign-up to start, and no school knowledge needed.

What's your IQ?

Take the IQ test

25 questions · about 12 minutes

Want the average rather than a test? The average IQ of a 15 year old is 100, at every age.

The test at a glance

Questions: 25 visual puzzles
Question types: 5 sets, each easy to hard
Time: 12-minute timer
Scoring: Same for every age, not age-adjusted
Cost: No sign-up to start. When you finish, you choose a report to see your result.

Scores are not age-normed, and this is not a clinical or diagnostic test.

For many 15 year olds this is a GCSE or mock-exam year in England, or ninth or tenth grade in the US. Tests are everywhere, so it is natural to wonder what an IQ number would say.

Here is what it says at 15, and what it does not.

How this test works for a 15 year old

You get 25 visual puzzles across five sets, each starting easy and getting harder, with a 12-minute timer. The scoring is the same for every age and is not age-adjusted. Fifteen is close to adult level on this kind of puzzle, so the gap from not being age-normed is smaller than for a younger teen but still present.

Take it rested. Tiredness from revision lowers scores more than most people expect.
Do it in one sitting, with no searching or help.
A second attempt scores higher partly from familiarity, so wait a good while before retaking.

What scores mean at 15

On an age-normed test such as the WISC-V, which covers ages 6 to 16, 100 is average for a 15 year old and about two thirds of 15 year olds score between 85 and 115. 130 is roughly the top 2%. The table applies to a properly normed test, not to ours.

Reasoning does predict exam results on average, but it leaves a lot unexplained. A study of more than 70,000 English children by Ian Deary and colleagues found reasoning at 11 correlated about 0.8 with GCSE results at 16 when both were measured as broad factors. Effort, teaching and interest account for much of the rest.

IQ	Higher than	How rare
85	15.9% of people	Common
100	50.0% of people	Common
115	84.1% of people	about 1 in 6 this high
122	92.9% of people	about 1 in 14 this high
126	95.8% of people	about 1 in 24 this high
130	97.7% of people	about 1 in 44 this high

Computed from the normal curve (mean 100, standard deviation 15). Applies to properly normed tests.

Would I score higher at 16?

Probably a little, but not because the test changes. Our test treats a 15 year old and a 16 year old the same, so there is no age adjustment either way. Raw reasoning on timed puzzles keeps improving into the late teens. Processing speed peaks around 18 or 19, according to a large study of online testers by Joshua Hartshorne and Laura Germine. A retake a year later will probably feel easier.

If you want to know how the test treats a 16 year old, see the IQ test for 16 year olds.