Children's books and reading: the statistics worth citing
Figures on children's reading, home libraries and book ownership, each one attributed to the study it came from, so you can check it before you cite it.
Statistics about children and books get repeated a great deal and sourced very rarely. What follows is a short, deliberately conservative list: every number below is linked to its primary study or the publishing body that produced it. Where a figure is commonly misquoted, we have said so.
If you are citing any of this, please link to the original study rather than to this page. The researchers did the work.
Reading aloud and vocabulary exposure
The best-known finding here comes from Jessica Logan and colleagues at Ohio State University, published in the Journal of Developmental and Behavioral Pediatrics in 2019 as “When Children Are Not Read to at Home: The Million Word Gap.” The study estimated cumulative words heard from books by age 5 at different reading frequencies:
- Never read to: about 4,662 words
- Read to 1–2 times per week: about 63,570 words
- Read to 3–5 times per week: about 169,520 words
- Read to daily: about 296,660 words
- Five books a day: about 1,483,300 words
This is the source of the widely repeated “1.4 million word” figure. It is worth quoting precisely: the 1.4 million gap describes the difference between children read five books a day and children never read to, not the difference between daily reading and none, which the same study puts at roughly 290,000 words. The larger number is frequently attached to the smaller claim.
The study estimates words heard from picture books specifically, based on word counts from a sample of board and picture books. It is a modelled estimate, not a measurement of individual children.
Source: Logan, Justice, Yumuş & Chaparro-Moreno (2019), Journal of Developmental and Behavioral Pediatrics; summary via Ohio State University.
Home libraries and educational outcomes
The most cited work on the size of a family’s book collection is Mariah Evans and colleagues’ “Family scholarly culture and educational success: Books and schooling in 27 nations,” published in Research in Social Stratification and Mobility in 2010, drawing on twenty years of data.
- Growing up in a home with 500 books was associated with 3.2 additional years of education on average, compared with an otherwise similar home with few or no books.
- The effect varied widely by country: about 6.6 years in China, and about 2.4 years in the United States.
- The researchers described the gap between a bookless home and a 500-book home as comparable in size to the gap between having barely literate parents and university-educated parents.
A caution worth stating plainly, because it is almost always omitted: this is an association across large populations, not a demonstration that buying books causes educational attainment. Households that accumulate books differ in many other ways.
Source: Evans, Kelley, Sikora & Treiman (2010), Research in Social Stratification and Mobility; summary via University of Nevada, Reno.
Book ownership among children
The National Literacy Trust surveys book ownership among children and young people in the UK annually. From its 2025 report:
- 89.7% of children and young people aged 5 to 18 said they had a book of their own at home, meaning roughly 1 in 10 did not.
- Ownership was higher among younger children: 92.2% of those aged 5 to 8, against 89.4% of those aged 8 to 18.
- There is a clear socioeconomic gap: 84.3% of children receiving free school meals reported owning a book, against 91.0% of those who did not.
- For year-on-year context, the equivalent overall figure was 90.2% in 2024.
Source: National Literacy Trust, Children and young people’s book ownership in 2025.
The children’s book market
For market context, Circana BookScan, which tracks roughly 85% of the US print market, reported that print book unit sales reached 762.4 million units in 2025, up 0.3% on 2024, with a rebound in children’s books offsetting softness in adult titles.
Source: Publishers Weekly, reporting Circana BookScan data.
The statistic that does not exist
There is no reliable published figure for how often families end up with duplicate copies of the same children’s book. We looked, because it is the number we would most like to cite. Nobody appears to measure it: retail data records sales, not household inventories, and literacy surveys ask whether children own books, not whether they own two of the same one.
We would rather say that plainly than repeat an invented number, which is the usual fate of a statistic nobody has. If we are ever in a position to measure it properly across a large enough sample, with permission and reported honestly including the limitations, we will publish it here and say exactly how it was calculated.
Using these figures
Two requests, both self-interested and sincere. First, link to the primary sources rather than to us; the studies deserve the traffic and readers deserve to check. Second, quote the million-word figure with its actual condition attached: five books a day, not simply “reading to your child”, because the overstated version has done real damage to how the finding is understood.
This page is maintained. If you spot a figure that has been superseded or a source that has moved, we would genuinely like to know.
Related: how to catalog a child’s bookshelf and why duplicate picture books happen.