Does Reading Make You Smarter? What the Research Shows

By the IQ Revealed Team · Updated October 3, 2026

Yes — reading does make you smarter, mainly by building vocabulary, general knowledge and verbal reasoning, the knowledge-based side of intelligence. Long-term studies suggest reading helps cause those gains, not just that clever people read more. The evidence that reading lifts problem-solving on unfamiliar puzzles is thinner, there is no reliable “IQ points per book” figure, and what you read matters more than how many pages you turn.

What “smarter” means here

Psychologists split general intelligence into two broad parts. Crystallized intelligence is what you know and can use: words, facts, concepts, the ability to follow and build an argument. Fluid intelligence is reasoning on new problems where knowledge does not help, such as the pattern puzzles in many IQ tests. Our guide to fluid vs crystallized intelligence explains the difference. Reading feeds the first part directly; its effect on the second is the open question.

The evidence that reading builds knowledge and verbal skill

The psychologist Keith Stanovich titled a 1993 research review with the same question this page asks. His studies measured “print exposure” — how much people actually read — and found that it predicted vocabulary, general knowledge and verbal skills even after controlling for abstract reasoning ability measured with Raven-style puzzles. In other words, two people with the same reasoning score differed in what they knew depending on how much they read. His conclusion: if “smarter” includes a larger vocabulary and more world knowledge, as it does in most people’s definition, reading may well make people smarter.

A follow-up of the same kind tracked first-graders for ten years. How quickly children learned to read in first grade predicted their reading volume, vocabulary and general knowledge in eleventh grade, even with cognitive ability taken into account — and differences in how much they read predicted how fast their comprehension grew.

The upward spiral

Does reading make people smarter, or do smarter people read more? Both. A 2011 meta-analysis of 99 studies with 7,669 participants found that leisure reading and language skills feed each other across development. The share of differences in oral language skills explained by print exposure grew with age:

preschool and kindergarten: about 12%
primary school: 13%
middle school: 19%
high school: 30%
college and university: 34%

Better readers read more; reading more makes them better readers again. The authors also found that weak readers benefit from leisure reading — the spiral is not reserved for the already able.

Can reading raise IQ itself?

The strongest test so far used identical twins, who share their genes and family. In a UK study of 1,890 identical twin pairs tested at ages 7, 9, 10, 12 and 16, the twin who read better earlier on tended to score higher on intelligence tests later. The association was not limited to verbal tests and was not explained by how much the twins read — it was reading ability that mattered. Because genes and home are matched within each pair, this design rules out many of the usual explanations, though the authors note the mechanism is still unclear.

There is no comparable experiment for adults who pick up more books. The best available yardstick is schooling, in which reading is central: a 2018 meta-analysis covering more than 600,000 people found that each additional year of education raised cognitive test scores by roughly 1 to 5 IQ points, across all broad abilities studied. That is a figure for education as a whole, not for reading alone. Our guide on whether you can increase your IQ sets it beside the methods that did not hold up, and the Flynn effect shows how much scores can shift across generations.

Reading for pleasure in childhood

A 2023 study of more than 10,000 young adolescents in a US national cohort compared children by how early and how long they had been reading for pleasure. Those who started early scored higher on cognitive tests and had fewer mental-health problems, after socio-economic status was taken into account. They also showed moderately larger total cortical area and volume. Early reading for pleasure was linked to higher crystallized cognition at follow-up, and about 12 hours a week was the level associated with the best cognitive results. Most of the evidence is observational, so the study points to reading as one healthy habit among many rather than proving cause.

Does fiction make you smarter about people?

In 2013 a study in Science reported that reading a short passage of literary fiction immediately improved people’s ability to judge others’ mental states. It became a widely shared headline. A replication by three independent groups with 792 participants then found no advantage for literary fiction over popular fiction, nonfiction or no reading. What did predict social understanding in both studies was lifetime exposure to fiction.

A 2018 meta-analysis of 14 studies settled on a modest middle: fiction reading produces a small, statistically significant improvement in social-cognitive performance compared with nonfiction or no reading. That links to emotional intelligence more than to IQ.

What you read matters

A 2025 study of students by Ivar Bråten and colleagues asked whether reading still makes people smarter in the age of the web. Experience with printed books and with websites carrying news and cultural content predicted higher verbal ability, directly and through better reading comprehension. Familiarity with entertainment and social-media sites had no such effect. The difference is not the screen but the text: sustained reading of substantial material builds the skills; skimming feeds does not.

Reading across the lifespan

In older age, the question turns from gaining ability to keeping it. A 2013 study followed 294 older people with yearly cognitive tests and examined their brains after death. More frequent mentally stimulating activity, in childhood, middle age and late life, was associated with slower cognitive decline — independent of the brain damage found at autopsy. Reading is one of the most common such activities. The finding is an association, but it fits the idea of “cognitive reserve”.

How to read for the benefit

Read things slightly above your level. New words and ideas in context are how vocabulary and knowledge grow.
Mix fiction and nonfiction. Nonfiction adds knowledge; fiction is linked to social understanding.
Choose sustained text over feeds. Books, long articles and serious journalism count; scrolling short posts does not seem to.
Make it a habit, not a sprint. The studies point to years of regular reading, not a few books read fast.
Start children early. Reading to and with children feeds the spiral before school begins.

Other promises of an easy upgrade have fared worse: the Mozart effect and the 10% of the brain myth did not survive testing. Reading, by comparison, has decades of consistent evidence behind it.

Trust and scope notes

This page summarises published research for general information. Most of the studies are correlational or quasi-experimental; we say so where it matters. The IQ Revealed test is an online reasoning test of 40 original items for adults aged 18 and over; it is not a clinical assessment. Our guide to how IQ tests work explains what an online test can and cannot tell you.

IQ Revealed is not affiliated with, endorsed by or connected to the journals, publishers, universities, researchers or study cohorts named on this page, or with the publisher of Raven’s Progressive Matrices. Names are used only to identify the research being described.

Frequently asked questions

Does reading make you smarter?＋

Yes, in a specific way. People who read more have larger vocabularies, more general knowledge and stronger verbal skills, and long-term studies suggest reading helps cause those gains rather than only reflecting them. That is the knowledge-based side of intelligence. Evidence that reading also raises reasoning on unfamiliar problems is thinner, though a large UK twin study found that early reading ability predicted later intelligence beyond verbal skills.

How much does reading increase IQ?＋

No study gives a reliable number for reading on its own. The closest figure is for education as a whole: a 2018 meta-analysis of more than 600,000 people found that each extra year of schooling raised cognitive test scores by roughly 1 to 5 IQ points. Reading is a large part of schooling, but that estimate covers everything a school year does, not books alone.

Do people who read a lot have a higher IQ?＋

On average, yes, but the link runs both ways. Children who read well find reading easier and enjoy it, so they read more; the extra reading then builds vocabulary and comprehension further. Researchers call this an upward spiral. A correlation alone cannot tell you how much of the gap is caused by reading.

Does reading fiction make you smarter?＋

Fiction seems to help social understanding a little. A 2013 study reported that reading a short passage of literary fiction improved people's ability to read emotions; a larger replication with 792 people did not find that effect. A 2018 meta-analysis of 14 studies found a small, real benefit of fiction on social-cognitive tasks. Lifetime fiction reading is more consistently linked to these skills than any single reading session.

Does reading on a phone count?＋

It depends on what you read. A 2025 study of students found that experience with printed books and with news and cultural websites predicted higher verbal ability, while familiarity with entertainment and social-media sites did not. The screen matters less than the text: sustained reading of substantial material is what the research links to verbal gains.

How much should you read to benefit?＋

There is no proven dose for adults. In a study of more than 10,000 young adolescents in the United States, children who had started reading for pleasure early scored higher on cognitive tests, and around 12 hours a week was the level linked to the best results. The study was mostly observational, so treat that as a pointer, not a prescription.