Parents searching for a children's IQ test are usually asking one of two things: what a score is supposed to look like at their child's age, or whether there is a test built for a particular school year. Both have short answers, and the first one surprises people.
Why the average is 100 at every age
An IQ score is not a count of correct answers. It is a comparison. A child's performance is set against the performance of other children of the same age in the test's norming sample, and that comparison is then expressed on a scale whose average is fixed at 100.
The scaling is done separately for each age band. A six-year-old is compared with six-year-olds, a twelve-year-old with twelve-year-olds. Which means the average IQ for a 12-year-old is 100 — and so is the average for a four-year-old, an eight-year-old and an adult. It is 100 by construction, the way a percentage is out of a hundred by construction. There is no age at which the average drifts upward as children learn more.
Two things follow from that, and both matter to parents. A child's score does not rise simply because they grow older and know more: the yardstick grows with them. And a score only means anything against the norms of the test that produced it, which is one reason a result from an unsupervised online quiz cannot be read next to one from a professional assessment.
Ages 4 to 6: assessment before and around school entry
At preschool and reception age, cognitive assessment looks less like a test and more like structured play. A child sits with one examiner and works through short activities: naming pictures, matching and copying shapes, building block patterns, repeating sequences, answering simple why-questions. Sessions are short, and are often split across visits, because attention, hunger and mood affect a four-year-old more than they affect anyone older.
Results at this age are the least stable of any age band — young children's measured performance moves around more from session to session — so professionals treat an early result as a snapshot rather than a settled fact, and will often re-assess later. Referrals at this age usually come from a nursery, a preschool or a paediatrician rather than from a parent's own testing.
Ages 7 and 8: the early school years
By seven or eight, most children can sit through a full one-to-one battery in one or two sittings, and the activities widen: vocabulary and verbal reasoning, reasoning with numbers, matrix puzzles, block design, remembering digit and picture sequences, and timed pencil tasks that sample processing speed.
This is the band where a school's assessment service is most often involved, because the gap that prompts a referral — what a child manages in a busy classroom versus what they can do in a quiet room with one adult — is exactly what an individual assessment is designed to describe.
Ages 9 to 12, or grades 4 to 7
This is where most searches land: an IQ test for 5th graders, for 6th graders, for 7th graders. The plain answer is that professional IQ tests are not organised by grade. They are organised by age, because age is what the norms are built from. A test "for 5th graders" is a test for nine-, ten- and eleven-year-olds, and which instrument is used depends on the child's age and on the question being asked, not on the year group.
What schools do organise by grade are group-administered ability and achievement tests — the sit-in-a-classroom, answer-sheet kind used for screening and placement. Those are useful, and they are not the same thing as an individual IQ assessment: no examiner watches how one child works, and results are normally read as one input among several rather than as a standalone verdict.
It is also the band where children start comparing themselves with each other, which is worth keeping in mind before introducing the idea of a score at all. Ability testing answers questions adults have about support and provision; it is not a ranking to hand a ten-year-old, and children who hear a number about themselves rarely hear it as the range-with-error-bars that it actually is.
Teenagers
Teenagers sit the same school-age instruments as younger children until the adult scale takes over in the mid-teens. The content shifts toward abstract reasoning, working memory and longer sustained attention, and the sitting itself is longer.
Assessment at this age usually has a specific purpose attached — an exam access arrangement, a question about a learning difference, a placement or subject decision — and the written report matters far more than any single figure in it.
Teenagers also arrive with opinions about being tested, which is a genuine variable rather than an inconvenience. Someone who has decided the exercise is pointless, or who is anxious about what it will say, does not work the way the norming sample worked, and a good examiner will say so in the report rather than quietly ignoring it.
The instruments professionals use
Four names come up constantly. They are worth recognising, and that is all, because none of them can be bought or sat at home.
- WPPSI — the Wechsler preschool and primary scale, used with the youngest band.
- WISC — the Wechsler scale for school-age children, the most widely used children's battery.
- Stanford-Binet (SB5) — a single battery spanning early childhood into adulthood.
- KBIT-2, the Kaufman Brief — a short screener used mainly to decide whether a fuller assessment is warranted.
All four are restricted instruments: publishers sell them only to buyers who can document the required qualifications, and they are administered one-to-one by a psychologist or another trained professional, usually across an hour or more. What comes back is not a number but a report — a profile of index scores plus the examiner's account of how the child actually worked. Our guide to the types of IQ test covers who publishes what in more detail.
When to see a professional
If you have a real concern — school work that does not match what you see at home, something a teacher has raised, a question about a learning difference, a placement decision coming up — the useful step is a licensed psychologist or your school's assessment service, not a test you run yourself.
They choose the instrument, administer it under the conditions it was normed for, and interpret the result alongside school reports, developmental history and direct observation. A number without that context does not answer any question worth asking, and nothing on this page or anywhere else online is a substitute for it.
Our quizzes are written for adults
Ours are entertainment, and they are built for grown-ups. The IQ-style test on this site is a forty-item screener you sit yourself, unsupervised and unverified, for curiosity and self-reflection. It is not normed for children, it is not an assessment, and a result from it says nothing about a child's ability.
There is no harm in a curious eleven-year-old trying a puzzle quiz alongside a parent. There would be harm in treating what it prints as information about them. If the question behind your search is a serious one, it belongs with someone qualified to answer it.
