How Many Questions Are on an IQ Test?

Quick Answer

It varies by test: the professionally administered WAIS-IV contains roughly 400–500 items across 10 core subtests (not all are given to every examinee), Raven's Standard Progressive Matrices has 60 puzzles, the Wonderlic has 50, and most online IQ-style tests use 20–50 questions.

Question Counts by Test

Professional batteries are adaptive in practice: the WAIS-IV's subtests each contain 20–50 items of rising difficulty, and the examiner stops a subtest after a run of failures, so no one sees every item. The Stanford-Binet 5 works the same way, routing examinees to harder or easier item sets based on early performance.

Fixed-form tests are simpler: Raven's Standard Progressive Matrices presents exactly 60 matrix puzzles; the Advanced version has 36 harder ones. The Wonderlic packs 50 questions into 12 minutes. Mensa's supervised session includes two separate tests taken back-to-back.

Online IQ-style tests typically use 20–50 questions. Ours uses 30, sampling five domains — enough to produce a stable estimate while staying under 15 minutes.

Does More Questions Mean More Accurate?

Up to a point. Reliability rises with item count, which is why professional tests are long — but well-targeted items matter more than raw quantity. Adaptive tests achieve high precision with fewer questions by concentrating items near the examinee's ability level. A short test's main cost is a wider confidence interval: a 30-question estimate is honest at ±7–10 points, while a full WAIS administration narrows that to about ±4–5.

Frequently Asked Questions

How many questions are on the Mensa test?

The US Mensa supervised session includes two tests taken back-to-back in about two hours. Item counts vary by version, but each test contains several dozen questions; qualifying at the 98th percentile on either one suffices.

How many questions does the WAIS have?

The WAIS-IV contains roughly 400–500 items across its 10 core and 5 supplemental subtests, but discontinue rules mean a typical examinee answers far fewer — testing stops within each subtest after consecutive failures.

Is a 30-question IQ test accurate?

It can produce a reasonable estimate — enough for education and self-knowledge — but with a wider margin of error than professional testing (roughly ±7–10 points versus ±4–5). For any high-stakes purpose, use a professionally administered test.