Charter Schools vs Public Schools: What the Data Actually Shows (2026)
We compared 7,750 charter schools to 110,696 traditional public schools on test scores, class sizes, ratings, and more. Here's what the numbers say.
The charter school debate generates more heat than light. Supporters call charters innovation engines; critics call them resource drains. Both sides work from anecdotes.
We pulled data instead: 118,446 schools in School Scout’s database, 7,750 of them charter schools and 110,696 traditional public schools. We compared them on test scores, student-teacher ratios, composite quality ratings, and equity metrics. No opinions. Just the numbers.
The results are messier than either side usually admits.
The national numbers: charter vs. traditional public
Here’s the head-to-head comparison across every metric in our database:
| Metric | Traditional Public | Charter Schools | Difference |
|---|---|---|---|
| Number of Schools | 110,696 | 7,750 | n/a |
| Avg. Composite Score (0-10) | 5.52 | 4.96 | -0.56 |
| Avg. Academic Score | 5.55 | 4.90 | -0.65 |
| Avg. Equity Score | 5.53 | 5.18 | -0.35 |
| Avg. Environment Score | 5.59 | 4.51 | -1.08 |
| Avg. Student-Teacher Ratio | 14.4:1 | 20.7:1 | +6.3 |
| Avg. Enrollment | 444 | 492 | +48 |
| Avg. Math Proficiency | 41.7% | 34.7% | -7.0 pts |
| Avg. ELA Proficiency | 47.5% | 44.2% | -3.3 pts |
At the national level, traditional public schools outperform charter schools on every academic metric. Charters score lower on composite ratings (4.96 vs 5.52), lower on test scores (math: 34.7% vs 41.7% proficient), and run significantly larger classes (20.7:1 vs 14.4:1).
But the raw national averages don’t tell the full story. Here’s why.
Why national averages are misleading
Three things inflate the gap you see above.
1. Charter schools disproportionately serve urban, high-poverty communities
Charter schools cluster in cities with high poverty rates, exactly the environments where all schools struggle. A charter in inner-city Philadelphia or on Chicago’s South Side faces a different set of challenges than a suburban public school in Naperville.
Comparing raw national averages of charters against public schools is like comparing the batting average of a player who only faces elite pitchers to one who faces the whole league. The charter population isn’t a random sample of students.
2. Virtual charters drag down the average
A meaningful share of charter schools are online programs, and virtual schools score lower on standardized tests across the board. These schools sit inside the charter averages even though their operating model has almost nothing in common with a brick-and-mortar charter.
3. Charter quality varies wildly by state and network
The best charter networks, KIPP, Success Academy, BASIS, produce some of the highest-performing schools in America. The worst charters underperform even the weakest traditional public schools. The average flattens a distribution that’s actually bimodal.
State-by-state: where charters do better (and worse)
We compared charter and traditional public school performance in the 10 states with the most charter schools:
| State | Public Schools | Charter Schools | Public Avg. Score | Charter Avg. Score | Gap |
|---|---|---|---|---|---|
| California | 10,319 | 1,412 | 5.51 | 5.30 | -0.21 |
| Texas | 9,286 | 998 | 5.60 | 4.42 | -1.18 |
| Florida | 4,587 | 849 | 5.47 | 5.39 | -0.08 |
| New York | 5,676 | 329 | 5.52 | 4.50 | -1.02 |
| Ohio | 4,176 | 324 | 5.59 | 4.24 | -1.35 |
| Arizona | 1,618 | 637 | 5.55 | 5.36 | -0.19 |
| Michigan | 3,299 | 383 | 5.58 | 5.15 | -0.43 |
| Colorado | 1,721 | 318 | 5.59 | 5.10 | -0.49 |
| North Carolina | 3,027 | 204 | 5.52 | 5.18 | -0.34 |
| Pennsylvania | 4,276 | 174 | 5.55 | 3.78 | -1.77 |
A few things stand out:
The gap swings wildly by state. In Florida, charters run almost even with traditional schools, a gap of just 0.08. In Pennsylvania and Ohio, the gap is massive: 1.77 and 1.35 points.
Florida and Arizona have the most competitive charter sectors, likely a product of mature, well-regulated charter environments.
Pennsylvania has the weakest charter performance of any state on this list, with charters averaging 3.78 against 5.55 for traditional public schools. Large virtual charter schools in Philadelphia, which have struggled academically for years, drive most of that gap.
Texas shows a wide gap too (-1.18), but its charter sector is also growing fast, with real variation between established networks and newer schools still finding their footing.
The class size problem
The most consistent finding in our data: charter schools run dramatically higher student-teacher ratios.
| State | Public School STR | Charter STR | Difference |
|---|---|---|---|
| Nationally | 14.4:1 | 20.7:1 | +6.3 |
| New York | 11.1:1 | 16.3:1 | +5.2 |
| Ohio | 16.3:1 | 21.8:1 | +5.5 |
| Texas | 13.4:1 | 17.4:1 | +4.0 |
| North Carolina | 14.2:1 | 18.2:1 | +4.0 |
| Pennsylvania | 13.0:1 | 14.1:1 | +1.1 |
In every state on this list, charter schools operate with fewer teachers per student. Nationally, the average charter has 6.3 more students per teacher than the average traditional public school.
That matters because research consistently shows smaller class sizes improve outcomes, especially for younger students and kids from lower-income families. Larger class sizes may explain part of the charter academic gap, but they also point to a real tradeoff: families choosing charters are often trading individual teacher attention for a different educational philosophy.
What charters do differently
The data shows real structural differences, not just a performance gap.
Smaller gap on equity
Charter schools score closer to traditional public schools on equity (5.18 vs 5.53, a gap of 0.35) than on any other metric. Some charter networks were built specifically to serve underrepresented communities, and the equity scores reflect that mission.
Larger average enrollment
Charter schools average 492 students against 444 for traditional public schools. That cuts against the common image of charters as small, intimate schools. Plenty of charter networks run large campuses.
Biggest gap: environment score
The environment score, which factors in student-teacher ratio, resources, and school climate, shows the widest gap: 4.51 for charters against 5.59 for traditional public schools. Most of that 1.08-point gap traces back to the student-teacher ratio difference.
What this means for parents
If you’re considering a charter school
1. Look at the specific school, not the category. “Charter” describes a governance structure, not a quality level. A top-quartile charter will outperform most traditional public schools nearby. A bottom-quartile charter may lag behind every other option in the area. Check the school’s ratings individually.
2. Ask about class sizes. If the charter you’re considering runs a 22:1 or 25:1 ratio, know that your child will get less individual teacher time than at most traditional public schools. Ask how the school compensates: teaching assistants, small-group instruction, technology-assisted learning.
3. Check the network. Schools inside established charter networks (KIPP, Success Academy, Great Hearts, BASIS) generally outperform independent charters. The network supplies curriculum support, teacher training, and quality control that a standalone school has to build from scratch.
4. Understand the tradeoffs. Charters often offer something different: a STEM or classical or arts focus, extended school days, a different discipline approach, unconventional teaching methods. Any of these might be exactly right for your child even when the aggregate numbers look middling.
If you’re choosing between specific schools
Don’t compare “charter vs public” as categories. Compare the actual schools on your list:
- Look up each school’s School Scout rating and see how they compare on student growth, poverty-adjusted academics, environment, and, for high schools, college readiness
- Check test scores for the grades your child will attend
- Visit both schools and talk to current parents
The best school for your child is the one that fits how they learn, meets their needs, and gets strong results for students like yours, whether the sign out front says “charter” or “public.”
The bottom line
The data shows that, on average, traditional public schools outperform charter schools nationally and in most states. But averages don’t choose schools. Parents do. And the variation within each category dwarfs the variation between them.
Some charter schools rank among the best in America. Some rank among the worst. The same is true of traditional public schools. The label matters less than the school.
Use the data to make the comparison. Look at schools in California, Texas, Florida, or any state →
Methodology
Data source: School Scout’s database of 118,446 public schools (traditional and charter), compiled from NCES Common Core of Data, state test scores, and computed composite ratings.
Charter identification: Schools are classified as charter based on the NCES is_charter flag in the Common Core of Data. Schools with null charter status were excluded.
Metrics: Composite scores (0-10) come from School Scout’s methodology: student growth, poverty-adjusted academic performance, and environment, plus college readiness for high schools, with weights that vary by school level. Equity is shown for context, not scored. Test proficiency data comes from state-reported standardized test scores.
Limitations: Charter school performance varies significantly by network, model (brick-and-mortar vs virtual), and state regulatory environment. National and state averages include all charter types. For school-level comparisons, visit individual school profiles on School Scout.
Data source: NCES Common Core of Data and state test score databases via MySchoolScout. Based on 2023-24 school year data. Last updated March 2026.
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