Enrollment
183
High
DISTRICT 172 · STATE 796
SCHOOL COMMUNITY·CALVIN NELMS CHARTER SCHOOLS·NCES 480012408248
Calvin Nelms High School
20625 CLAY RD, KATY, TX 77449 · (281) 398-8031 · Harris County
GRADES 09–12HIGH21-SUBURBCHARTERREGULAR SCHOOL183 STUDENTS
Student : Teacher
17.6:1
10 FTE teachers
DISTRICT 19.3:1 · STATE 15.1:1
Free / Reduced Lunch
,
Title I proxy
STATE 65%
Community
0
0 members
Enrollment and student:teacher ratio compared against other high schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 9 | 49 | 27% |
| Grade 10 | 43 | 23% |
| Grade 11 | 54 | 30% |
| Grade 12 | 37 | 20% |
Student demographics
58%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 58% · STATE 63% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
School pathway
Feeds from
Based on grade levels within CALVIN NELMS CHARTER SCHOOLS. Attendance zones can vary; confirm enrollment with the district.
Test scores
STAAR 2025-26 . % Meets Grade Level or AboveReading
75.0%
TX avg 54.5% . +11.0pp since 2020
Mathematics
70.0%
TX avg 45.3% . +41.0pp since 2020
What this means: On the STAAR, Texas's statewide test, about 75 of every 100 students at this school read at grade level and about 70 of 100 do math at grade level. Across all Texas schools, those numbers are about 55 and 45. Reading scores are up about 11 points since 2020, while math scores are up about 41 points.
Performance levels, 2025-26
| Subject | Masters Grade Level | Meets Grade Level | Approaches Grade Level | Did Not Meet Grade Level |
|---|---|---|---|---|
| Reading | 14.0% | 61.0% | 18.0% | 7.0% |
| Mathematics | 33.0% | 37.0% | 28.0% | 2.0% |
Share of tested students at each STAAR level. Each student counts in one level, so a row adds to about 100%.
STAAR results by year
| School year | Reading | Mathematics |
|---|---|---|
| 2025-26 | 75.0% | 70.0% |
| 2024-25 | 83.0% | 76.0% |
| 2023-24 | 86.0% | 58.0% |
| 2022-23 | 60.0% | 71.0% |
| 2021-22 | 58.0% | 67.0% |
| 2020-21 | 64.0% | 29.0% |
% Meets Grade Level or Above, all students and all tested grades.
Source: STAAR. All students, all grades. See all years and grades →
Where Calvin Nelms High School ranks
Among high schools| Measure | This school | In Texas | In Harris County |
|---|---|---|---|
| Math proficiency ranked highest first | 70.0% | #138 of 1,425 ▼ 75 | #27 of 155 ▼ 13 |
| Reading proficiency ranked highest first | 75.0% | #260 of 1,425 ▼ 142 | #37 of 155 ▼ 17 |
| 3-year test score change ranked biggest gain first | +7.0pp | #903 of 1,184 | #126 of 151 |
| Enrollment ranked largest first | 183 | #1,373 of 2,107 | #162 of 223 |
Ranked against other public high schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
183
+18 (+11%) vs 2020
+9% since 2000-01, when it was 168
Student : Teacher
17.6:1
was 18.3:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 183 | 10.4 | 17.6:1 | N/A |
| 2023-24 | 168 | 10 | 16.8:1 | N/A |
| 2022-23 | 169 | 10 | 16.9:1 | N/A |
| 2020-21 | 165 | 9 | 18.3:1 | 21% (34) |
| 2017-18 | 164 | 10.7 | 15.3:1 | 39% (64) |
| 2015-16 | 165 | 12 | 13.8:1 | 28% (46) |
| 2010-11 | 156 | 11 | 14.2:1 | 30% (47) |
| 2000-01 | 168 | 9 | 18.7:1 | 1% (2) |
Source: NCES Common Core of Data. Rows are the federal collections on file for Calvin Nelms High School.
Since 2017-18: students up 12% (164 to 183); teachers down 3% (10.7 to 10.4).
About Calvin Nelms High School
Calvin Nelms High School is a very small high school in KATY, Texas, (ZIP code 77449). Students in grades 9 through 12 make up the school's enrollment of 183 students. That puts enrollment 77% below the 796-student average for high schools in Texas.
CALVIN NELMS CHARTER SCHOOLS oversees Calvin Nelms High School and 1 other school, with 343 students in total.
The student body at Calvin Nelms High School is 61% Hispanic. The rest of enrollment is 16% White, 16% Black, 4% Asian, and 4% multiracial. Among all residents of Harris County, the Hispanic share is about 44%. A diversity index of 58% means there is a 58% chance two randomly chosen students at Calvin Nelms High School are from different groups.
The school lists 10.4 full-time-equivalent teachers and a student-to-teacher ratio of 17.6:1. The average for high schools in Texas, 15.1:1, is lower.
Harris County is the school's county. There, the median household earns about $74,983 a year, a bachelor's degree or higher is held by about 34% of adults, and the share of residents below the poverty line is 13%. Public schools in Harris County number 1,205, with about 886,911 students.
Calvin Nelms Middle School sits less than a tenth of a mile from Calvin Nelms High School. Inside a five-mile radius, there are at least 8 other public schools.
The NCES locale for Calvin Nelms High School is Suburb: Large, which covers schools in a suburban area outside a principal city, within an urbanized area with a population of 250,000 or more. Calvin Nelms High School is a public charter school.
From 2020-21 to 2024-25, enrollment increased from 165 to 183, an 11% rise.
This community page is for conversations about athletics, class schedules, and weather closures. You can also rate the school on this page.
Harris County at a glance
View full county profilePopulation
4,838,303
Census ACS
Median income
$74,983
Household, ACS
Bachelor's+
34%
Adults 25+
Poverty rate
13%
Below federal line
Schools in county
1,205
886,911 students
Quick facts
Related schools
Other schools in CALVIN NELMS CHARTER SCHOOLS
- Calvin Nelms Middle SchoolMiddle · 160 students
Other schools in KATY
- Seven Lakes High SchoolHigh · 3,773 students
- Cinco Ranch High SchoolHigh · 3,740 students
- Katy High SchoolHigh · 3,543 students
- Paetow High SchoolHigh · 3,447 students
- Taylor High SchoolHigh · 3,384 students
- Jordan High SchoolHigh · 3,330 students
Nearby schools
- Calvin Nelms Middle School0.0 mi · 160
- Brosnahan Elementary School0.6 mi · 1,035
- Robinson Elementary School0.6 mi · 908
- T H McDonald Junior High School0.7 mi · 966
- Loraine T Golbow Elementary School0.8 mi · 640
- McRoberts Elementary School0.9 mi · 864
Frequently asked questions
About Calvin Nelms High SchoolWhat is the total enrollment at Calvin Nelms High School?
Calvin Nelms High School enrolls approximately 183 students in grades 09-12.
What age range does Calvin Nelms High School serve?
Calvin Nelms High School serves students from grade 09 through grade 12.
How many students per teacher at Calvin Nelms High School?
Approximately 17.6:1 students per teacher at Calvin Nelms High School.
How diverse is Calvin Nelms High School?
Calvin Nelms High School reports a student body of 16% White, 61% Hispanic, 16% Black, 4% Asian, 4% Two or more.
Who oversees Calvin Nelms High School?
Calvin Nelms High School is overseen by CALVIN NELMS CHARTER SCHOOLS in Harris County.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.