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IQ Test

Five short parts — logic, numbers, shapes, memory and speed — in about 20 minutes. You get an honest profile of your strengths, not a made-up number.

  1. 1
    Logic12 picture puzzles — find the missing tile
    10 min
  2. 2
    Numbers8 number series — what comes next
    6 min
  3. 3
    Shapes8 shapes to turn in your head
    4 min
  4. 4
    MemoryDigits forwards and backwards, then tiles
    no limit
  5. 5
    SpeedSpot whether two codes match
    90 sec

Why there is no IQ number at the end. A real IQ score compares you with thousands of people who took exactly the same test. This one has not been tried on such a group, so printing “IQ 124” would be made up. You get a percentage for each part, your memory compared with published averages, and a plain-words summary instead.

Before you start

  • Find 20 quiet minutes. Put the phone on silent; the memory part is easily spoiled by a notification.
  • Paper is allowed, a calculator is not. Jotting down numbers in part 2 is fine.
  • The puzzles get hard. The last few in each part are meant to stop most people. Skip and come back if you are stuck.
  • A bigger screen helps for the picture puzzles, but everything works on a phone.

What each part measures

PartWhat it asksKnown in psychology as
LogicFind the rules in a 3 × 3 grid of pictures and pick the missing oneMatrix reasoning — the idea behind Raven’s Progressive Matrices; a core measure of fluid reasoning
NumbersFind the rule in a row of numbers and give the nextNumber series — inductive reasoning with numbers
ShapesFind the one shape that is the target turned, not mirroredMental rotation, after Shepard and Metzler’s experiments of 1971
MemoryRepeat digits in order and backwards, then a path of tilesDigit span (part of the Wechsler scales) and the Corsi block-tapping test
SpeedDecide quickly whether two codes matchProcessing speed — perceptual comparison

Every picture puzzle, number series and shape is made by the page from a fixed seed and checked before use: in the picture puzzles, every common rule that fits the eight tiles shown must point to the same missing tile; in the number series, no other common rule may give a different next number; and the shapes are chosen so that a mirror image can never be turned to match. There are three versions of the test (forms A, B and C), so a second attempt gets new questions of the same kinds and difficulty.

How real IQ tests work

An IQ (“intelligence quotient”) is not a raw score. A test such as the Wechsler Adult Intelligence Scale (WAIS) is first given to a large sample of people chosen to match the population by age and background. Their results are then scaled so that the average is 100 and the standard deviation is 15. About two people in three score between 85 and 115, and about 19 in 20 between 70 and 130. When you take the test, your raw answers are turned into an IQ by looking up where they would fall in that sample.

That is why a test that has never been given to a matched sample cannot honestly report an IQ. It is also why scores drift: average raw scores rose for most of the twentieth century (the Flynn effect), so the big tests are re-normed every so often.

A full test is also given one to one by a trained psychologist, takes an hour or more, and covers things this page does not, such as vocabulary, general knowledge and verbal reasoning. If you need a real score — for a learning assessment, for example — ask a qualified clinical or educational psychologist.

Reading your result

Each part is shown as a percentage. For logic, numbers and shapes it is simply how many you got right out of the questions asked. Memory turns your three spans into a percentage on a scale from 3 to 9 digits or tiles (2 to 8 backwards), and also tells you how each span compares with what most adults manage: about 6 or 7 digits in order, 4 or 5 backwards, and 5 or 6 tiles. Speed counts right answers minus wrong ones in 90 seconds, with 60 as the top of the scale.

The overall percentage is the average of the five, and the label above it — Getting started, Fair, Good, Strong or Exceptional — describes how much of the test you solved, not how you compare with anyone else. Your result also names your strongest part and suggests a game in Brain Games to practise the weakest.

Treat a single result lightly. Sleep, stress, the device and simple practice all move scores by several points; a second attempt is usually a little higher.

Questions

Will this test tell me my IQ?

No, and no free online test honestly can. An IQ compares you with a large group who took the same test; this test has not been given to such a group. Instead it shows how much of each part you solved and compares your memory with published averages.

How long does it take?

About 20 to 25 minutes. You can pause between parts and continue later on the same device; a part that was interrupted starts again from its first question.

Can I take it again?

Yes. Forms A, B and C have different questions of the same kinds; each new attempt on this device gets the next form. Expect a few points of rise from practice alone.

Does it work on a phone?

Yes. The picture puzzles are easier to see on a larger screen, so turn the brightness up or use a tablet or laptop if you have one.

How do I get a real IQ score?

From a qualified psychologist using a standardised test such as the WAIS or Raven’s Progressive Matrices, given in person. Schools, hospitals and private clinical or educational psychologists can arrange one.

Is my result saved or sent anywhere?

Results are kept in this browser only. Nothing is uploaded. Copy link and Share make a link that carries just the scores and the date.

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