Dyslexia Prevalence: Key Figures

Dyslexia is the most common neurodivergent condition in the world, affecting an estimated 5% to 20% of Americans, according to the Yale Center for Dyslexia & Creativity.¹ This wide range is due to differences in prevalence estimates across countries, languages, gender, and diagnostic practices. This report breaks down those differences using data from Yale’s dyslexia research center, peer-reviewed neuroscience journals, and U.S. federal health surveillance.

Dyslexia Prevalence: Fast Facts

• Dyslexia affects an estimated 5-20% of the U.S. population, making it the most common neurodivergent condition in the country.¹
• Rates run lower in “transparent” languages like Italian (~3.2%) than in English (5-17%), because a language’s spelling changes how visibly dyslexia shows up.²
• U.S. diagnoses of learning disabilities, such as dyslexia and dyscalculia, rose from 7.9% of children in 2016 to 9.2% in 2023, a 16% increase in seven years.³
• Dyslexia is diagnosed in males at roughly twice the rate of females.⁴
• Between 25% and 40% of people with dyslexia also have ADHD, and vice versa.⁵
• Dyslexia isn’t just a reading disorder; it’s linked to broader executive function difficulties, including inhibition and working memory, in both children and adults.¹¹

Dyslexia Prevalence by Country

No single global registry tracks dyslexia the way health agencies track autism or ADHD, so estimates are pieced together from national surveys and language-specific studies. The figures below represent the best available estimate for each region.

Dyslexia is one of the few neurodivergent conditions where these cross-country differences have a real linguistic basis, not just a diagnostic one. This is explained in further detail below.

Why Language Changes the Numbers

The reason Italy’s rate looks so much lower than the United States’ comes down to spelling. Italian is a “transparent” language, meaning its written form maps closely and consistently to how words sound. On the other hand, English is a deeper language full of irregular spellings and silent letters.

Reading in a deep orthography is harder for everyone, so the same underlying decoding difficulty is more likely to become visible and diagnosable in an English-speaking classroom than an Italian one.² Therefore, a child with mild dyslexia might read Italian reasonably well but struggle significantly with English. It’s the same disorder, but its disability looks different depending on the language a child is learning to read in.

Rising Diagnosis Rates

U.S. federal survey data tracks a broad “learning disability” category that includes both dyslexia and dyscalculia. That category grew from 2016 to 2023, the only two years for which comparable national data exists:

That’s a 16% increase in seven years, tracked through the National Survey of Children’s Health.³ Since dyslexia and dyscalculia are combined in this federal category, it isn’t possible to isolate exactly how much of that growth is dyslexia specifically. However, reading disorders make up the large majority of learning disability diagnoses, so the data is a reasonable comparison for rising dyslexia identification.

Despite more children being diagnosed, that doesn’t necessarily mean more children actually have dyslexia. The rise could just as easily reflect better screening, which is the same explanation researchers give for the parallel rise seen in autism and ADHD diagnoses over the same period.

The Gender Gap

Similar to most neurodivergent conditions, dyslexia is diagnosed more often in males than females:

Dyslexia’s roughly 2:1 ratio is more balanced than the diagnostic gaps in autism or ADHD, but it still suggests that girls with dyslexia may be underidentified relative to boys.

Overlap With Other Conditions

Dyslexia rarely occurs in isolation. It shares underlying neural and cognitive features with other executive-function-related conditions. 25% to 40% of people with dyslexia also have ADHD, and vice versa, according to a 2019 review in the Journal of Neurodevelopmental Disorders that found shared neural correlates between the two conditions.⁵

Dyslexia’s connection to executive functioning goes beyond its overlap with ADHD. A 2002 study in Neuropsychologia found that both dyslexic children and adults underperformed on tasks requiring inhibition and working memory compared to non-dyslexic peers. This is evidence that difficulties with executive control are a feature of dyslexia in their own right, not just a byproduct of co-occurring ADHD.¹¹

A 2025 Psychological Science study puts a sharper number on how far overlap extends across all three learning-related conditions. Among children with at least one of ADHD, dyslexia, or dyscalculia, most have only one, but nearly a quarter have two or more.

Source: van Bergen et al., Psychological Science, 2025.⁸

Diagnosed vs. Estimated True Prevalence

Unlike ADHD or Tourette’s syndrome, where national surveillance systems measure both diagnosed and estimated prevalence, dyslexia has no equivalent U.S. tracking system. The Yale Center for Dyslexia & Creativity notes that up to 20% of the population may have dyslexia, yet only a minority are ever formally diagnosed during their school years.¹

Since there isn’t a dyslexia-specific registry comparable to the CDC’s autism and ADHD surveillance networks, the true share of undiagnosed cases can’t be measured directly. Furthermore, the wide 5% to 20% range of prevalence estimates is itself a signal of how inconsistently identification happens from school to school and country to country.

Learning Disability Diagnosis by Family Income

U.S. survey data show a clear income pattern in learning disability diagnosis, a category dominated by dyslexia and dyscalculia. A 2023 JAMA Pediatrics study tracked this using nationally representative data on 188,449 U.S. children and adolescents from 1997 to 2021, breaking diagnosis rates into four income tiers:

The data shows that children in the lowest income bracket are diagnosed at roughly twice the rate of children in the highest bracket.⁹ This may seem counterintuitive if you expect wealthier families to have more access to diagnosis, but learning disabilities are identified mainly through public school evaluations, which U.S. law guarantees for free regardless of income. A 2011 study in the Journal of Learning Disabilities found that income, not race, explains most of the gap in who gets diagnosed with a learning disability.¹⁰

Key Findings

Dyslexia is the most common neurodivergent condition, affecting an estimated 5-20% of Americans and a comparable 5-10% globally.^{1, 2} Unlike most other neurodivergent conditions, its prevalence has a real linguistic basis, with transparent-spelling languages like Italian showing lower rates than English, independent of screening quality.² U.S. diagnosis of learning disabilities, which is the closest tracked proxy for dyslexia, rose 16% between 2016 and 2023. This is consistent with the trend of rising identification seen across neurodivergent conditions.³

Males are diagnosed at roughly twice the rate of females, and dyslexia overlaps substantially with ADHD (25-40% of cases in both directions).^4,5 Finally, no national system tracks the gap between diagnosed and undiagnosed dyslexia, leaving a wide range between the 5% floor and 20% ceiling of current estimates.¹

Sources

1. Yale Center for Dyslexia & Creativity. (n.d.). Yale Dyslexia. https://dyslexia.yale.edu/dyslexia/dyslexia-faq/
2. Hale, T. (2023, December 7). Dyslexia. IFLScience. https://www.iflscience.com/dyslexia-differs-across-languages-especially-when-it-comes-to-english-71884
3. Xu, C., Li, Y., Yu, H., Li, Q., Liang, Y., Zhou, K., Li, Q., Yu, X., Zeng, X., Qu, Y., & Yang, W. (2025). Rising prevalence of parent-reported learning disabilities among U.S. children and adolescents aged 6–17 years: NSCH, 2016–2023. PLoS ONE, 20(10), e0333850. https://doi.org/10.1371/journal.pone.0333850
4. Hawke, J. L., Olson, R. K., Willcut, E. G., Wadsworth, S. J., & DeFries, J. C. (2009). Gender ratios for reading difficulties. Dyslexia, 15(3), 239–242. https://doi.org/10.1002/dys.389
5. McGrath, L. M., & Stoodley, C. J. (2019). Are there shared neural correlates between dyslexia and ADHD? A meta-analysis of voxel-based morphometry studies. Journal of Neurodevelopmental Disorders, 11(1), 31. https://doi.org/10.1186/s11689-019-9287-8
6. Shaw, K. A., Williams, S., Patrick, M. E., Valencia-Prado, M., Durkin, M. S., Howerton, E. M., Ladd-Acosta, C. M., Pas, E. T., Bakian, A. V., Bartholomew, P., Nieves-Muñoz, N., Sidwell, K., Alford, A., Bilder, D. A., DiRienzo, M., Fitzgerald, R. T., Furnier, S. M., Hudson, A. E., Pokoski, O. M., . . . Maenner, M. J. (2025). Prevalence and early identification of autism spectrum disorder among children aged 4 and 8 years — Autism and Developmental Disabilities Monitoring Network, 16 sites, United States, 2022. MMWR Surveillance Summaries, 74(2), 1–22. https://doi.org/10.15585/mmwr.ss7402a1
7. Martin J. Why are females less likely to be diagnosed with ADHD in childhood than males? The Lancet Psychiatry. 2024. https://www.thelancet.com/journals/lanpsy/article/PIIS2215-0366(24)00010-5/fulltext
8. Van Bergen, E., De Zeeuw, E. L., Hart, S. A., Boomsma, D. I., De Geus, E. J. C., & Kan, K. (2025). *Co-Occurrence and causality among ADHD, dyslexia, and dyscalculia. Psychological Science, 36(3), 204–217. https://doi.org/10.1177/09567976241293999
9. Li Y, Li Q, Zheng J, Zeng X, Shen T, Chen Q, Yang W. Prevalence and Trends in Diagnosed Learning Disability Among US Children and Adolescents From 1997 to 2021. JAMA Pediatrics. 2023;177(9):969–972. https://doi.org/10.1001/jamapediatrics.2023.2117
10. Shifrer, D., Muller, C., & Callahan, R. (2010). Disproportionality and learning disabilities: parsing apart race, socioeconomic status, and language. Journal of Learning Disabilities, 44(3), 246–257. https://doi.org/10.1177/0022219410374236
11. Brosnan, M., Demetre, J., Hammil, S., et al. (2002). Executive functioning in adults and children with developmental dyslexia. Neuropsychologia, 40(12), 2144-2155. https://pubmed.ncbi.nlm.nih.gov/12208010/