Literacy is the quietest measure of how a society is doing. It rarely makes headlines, yet it sits underneath almost everything else: employment, health, income, and whether a child in fourth grade will still be in school at sixteen. The long-run story is genuinely good news. Two centuries ago only about one person in ten could read. Today nearly nine in ten adults can.
But the recent story is more unsettling. Global progress has slowed, the gender gap has barely budged, and in the United States both adult and childhood reading scores have slipped to levels not seen in decades. Below are the latest literacy statistics, pulled from UNESCO, the World Bank, the US Nation’s Report Card (NAEP), the OECD’s PIAAC survey, and Gallup, with the year of each figure stated so you can see exactly how current it is.
Global Literacy Statistics
The Global Adult Literacy Rate Reached 88% in 2024
The share of adults aged 15 and older who can read and write reached 88% in 2024, according to UNESCO, up from 86% in 2015. That leaves roughly 12% of the world’s adult population unable to read and write a simple statement about everyday life.
For historical context, the World Bank series shows the global adult rate climbing from about 67% in the early 1970s. The gains are real, but the pace has flattened in recent years as the hardest-to-reach populations remain the last unserved.
739 Million Adults Still Cannot Read
Even at 88%, the absolute number of people left behind is large. UNESCO estimates 739 million adults lacked basic literacy skills in 2024, down from 754 million in 2023. Much of that year-over-year drop reflects revised UN population estimates and updated national data rather than a sudden surge in schooling.
The burden is heavily concentrated. Sub-Saharan Africa alone saw its number of illiterate adults rise from 196 million to 225 million between 2015 and 2024, as population growth outran gains in schooling.
Nearly Two-Thirds of Illiterate Adults Are Women
The literacy gender gap has proven stubborn. Of the 739 million adults who cannot read, 466 million are women, close to two-thirds of the total. That imbalance has held roughly steady for decades and is widest in the lowest-income regions, where girls are still more likely to be pulled out of school for work or family duties.
The divide is starkest among older adults. In sub-Saharan Africa, only 31% of elderly women are literate, compared with 55% of elderly men.
Youth Literacy Sits at 93%
The most hopeful global number is the youth rate. Among people aged 15 to 24, the global literacy rate was 93% in 2024. Because young people read at higher rates than their grandparents, overall literacy will keep drifting upward as older, less-literate generations age out, even if schooling stopped improving tomorrow.
The Highest and Lowest Rates by Country
Country-level literacy varies enormously. Several nations report rates at or near 100%, including Uzbekistan, Norway, Finland, Luxembourg, and Andorra, according to World Population Review. At the other end, South Sudan sits near the bottom at roughly 27%, weighed down by conflict, poverty, and a shortage of schools and teachers.
These figures come with a caveat: countries define and measure literacy differently, and many do not report every year, so the lowest-ranked numbers in particular should be read as estimates rather than precise counts.
US Literacy Statistics
54% of US Adults Read Below a 6th-Grade Level
The single most-cited US figure comes from a 2020 Gallup analysis for the Barbara Bush Foundation, which found that 54% of adults aged 16 to 74, about 130 million people, read below the equivalent of a 6th-grade level. It is a modeled estimate rather than a direct test of every adult, but it draws on the same federal skills data used across the field.
The income link is direct. That same study found adults reading at a 6th-grade level earned about $63,000 a year on average, versus roughly $34,000 for those at the lowest literacy levels.
28% of US Adults Now Score at the Lowest Literacy Level
More recent testing points the wrong way. In the OECD’s 2023 PIAAC survey, released by the US NCES in late 2024, 28% of adults aged 16 to 65 scored at Level 1 or below in literacy, up sharply from 19% in 2017. Average US adult literacy scores fell 12 points over that same six-year window.
In other words, the share of American adults with the weakest reading skills grew by nearly half in just six years, a decline that shows up across nearly every demographic group.
Only 31% of US 4th Graders Are Proficient Readers
The pipeline into adult literacy runs through elementary school, and here the news is difficult. On the 2024 NAEP reading assessment, just 31% of fourth graders scored at or above the Proficient level, down from 35% in 2019. Reading scores were 5 points lower than in 2019 and had not recovered from the pandemic.
Fourth grade matters because it is the point where children shift from learning to read toward reading to learn. Students who are not proficient by then tend to fall further behind in every subject that depends on reading.
40% of 4th Graders Fell Below the Basic Level
The bottom of the distribution is where the alarm is loudest. In 2024, 40% of fourth graders scored below the NAEP Basic level in reading, the largest share since 2002. Among eighth graders, 33% scored below Basic, the highest percentage ever recorded, and fewer than a third reached Proficient.
“Below Basic” means a student cannot reliably locate information, make simple inferences, or identify the main idea of an age-appropriate passage. That struggling cohort is now larger than it has been at any point in the modern testing era. For families weighing alternatives, the pressure shows up in rising interest in homeschooling and other options outside the traditional classroom.
The Cost of Low Literacy
Low Literacy Costs the US Economy an Estimated $2.2 Trillion a Year
Weak literacy is expensive. The Gallup and Barbara Bush Foundation study estimated that bringing every US adult up to a 6th-grade reading level would generate an additional $2.2 trillion in annual income, close to 10% of GDP. The gap flows through lost productivity, lower earnings, and higher public spending on health and welfare.
Globally the toll is larger still. The World Literacy Foundation estimates that illiteracy costs the world economy well over a trillion dollars each year in lost output and higher social costs, and it notes that every dollar invested in early reading returns many times over.
Literacy, Employment, and the Path Forward
Literacy shapes who works and who earns. Adults with the weakest literacy skills are far more likely to be unemployed or stuck in low-wage roles, and low literacy tends to pass from one generation to the next, since a child’s earliest reading model is usually a parent.
The encouraging part is that literacy responds to investment. Adult education programs, phonics-based early instruction, and the growth of online learning and e-learning have widened access to reading support for both children and adults who missed it the first time. The tools to close the gap exist; the challenge is reaching the people who need them.
The Bottom Line
Zoom out and the two-century trend is one of the great human success stories: from one reader in ten to nearly nine in ten. Zoom in on the last decade and the picture is more mixed. Global gains have slowed, 739 million adults still cannot read, and women remain two-thirds of that total.
In the United States the warning signs are sharper. More than half of adults read below a 6th-grade level, the share scoring at the lowest literacy band jumped from 19% to 28% between 2017 and 2023, and childhood reading scores have fallen to their weakest point in decades. Literacy is not a solved problem. It is a fragile gain that each generation has to earn again, and the most current data suggests the US is at risk of losing ground unless the trend in classrooms turns around.
