Can IQ be improved with practice?

It depends on what you mean by 'improve IQ'. If you mean 'improve your score on a particular IQ test', the answer is yes — practice with similar items reliably produces 0.3 to 0.8 standard deviation improvements on subsequent administration. If you mean 'improve your underlying general cognitive ability', the evidence is much weaker. Working-memory training, n-back tasks, and commercial brain-training apps produce reliable gains on the trained tasks but transfer to general fluid intelligence is small and inconsistent in well-controlled studies. The most reliable cognitive interventions across studies are aerobic exercise (small to moderate gains across attention and executive function), adequate sleep (large effects on working memory and processing speed), and reading volume (substantial gains on crystallized intelligence over years).

This question comes up frequently from users of free online IQ tests and from people considering whether to pursue a clinical evaluation. The full answer depends on context — what the score will be used for, how recently the test was administered, and what other information is available. The brief answer above captures the broad consensus from the published research literature; the linked deep-dive articles cover the underlying evidence in more detail.

Related considerations include the standard error of measurement on the relevant test, the population the test was normed against, and the specific cognitive abilities the test samples. A score is much more informative when interpreted alongside these contextual variables than when reported as a bare number.

If this answer raises further questions, see the related FAQ entries listed in the sidebar and the longer-form articles on the same topic in the article library. The site is designed to provide layered depth: the FAQ entries offer concise answers, the deep-dive articles offer the underlying research, and the score-interpretation pages tie the abstract concepts to specific result bands.