The 40-question IQ test, explained

Why 40 questions?

Short tests (10–15 items) are noisy: a couple of lucky or unlucky answers can move the result by a full band. Long clinical batteries (100+ items) take hours. A 40-question format is a deliberate middle ground — long enough to average out random noise, short enough to finish in one sitting.

Every question follows the same principle: there is a single best answer that does not depend on language-specific trivia or school knowledge, so results stay comparable across ages, countries, and education levels.

What the questions cover

The item set draws on classic fluid-reasoning formats used in widely studied tests:

• Pattern and matrix completion
• Number and letter sequences
• Analogies and rule application
• Logical deduction from short premises

How scoring works

Your answers determine how many items you solve correctly; the result is then placed on the scale by comparing your performance with the full dataset rather than fixed cut-offs. That dataset includes hundreds of thousands of submissions across 29 language versions.

The result page reports your IQ-style score, your percentile within the dataset, and comparisons by age band, education level, and country where enough data exists. Because the comparison base is this dataset, percentile statements refer to our test-takers — a self-selected online group.

Making the most of your attempt

• Take the test somewhere quiet, on a device you are comfortable with
• Do not rush — you can think through each item before answering
• Do not obsess over any single hard question; keep moving
• Treat the score as an estimate with a margin of error, not a verdict