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Calvin Nelms High School

Q: Is Calvin Nelms High School a good school?

Calvin Nelms High School ranks 201 st of 2009 Texas high schools. SchoolDigger rates this school 5 stars out of 5.

Public, Charter Grades 9-12

201^st

SchoolDigger Rank ?

of 2,009 Texas High Schools

Better than 90% of Texas high schools

Summary

Calvin Nelms High School in Katy, TX, is a small, high-performing charter school serving 183 students in grades 9-12, offering a personalized alternative to the much larger traditional high schools in the area. Part of the Calvin Nelms Charter Schools district, which holds a 5-star rating and ranks in the 94th percentile statewide, this school consistently ranks in the top 10% of all Texas high schools. Its academic performance is exceptional, with proficiency rates far exceeding state averages and nearby schools like Langham Creek High School, Cypress Park High School, and Morton Ranch High School. For example, Calvin Nelms achieves an 83.33% proficiency rate in Algebra I compared to around 34% at those larger schools, and an 87.5% rate in U.S. History versus roughly 72% at nearby schools.

What truly sets Calvin Nelms apart is its perfect 100% graduation rate and 0% dropout rate over the last several years, a stark contrast to neighboring schools like Mayde Creek High School (87.1% graduation) and Cypress Lakes High School (2.9% dropout rate). The school achieves these outstanding results with remarkable efficiency, spending just $8,584 per student—less than every nearby school, including those in the Katy Independent School District (Isd) and Cypress-Fairbanks Independent School District (Isd), which spend between $8,904 and $10,867 per student. This suggests a highly effective use of resources, driven by its focused charter model and supportive culture.

Calvin Nelms also excels with specific student groups, ranking in the 90th percentile or higher for African American, Hispanic, and low socio-economic status students, demonstrating its ability to close achievement gaps. However, recent data shows a notable decline in performance for special education and English language learner students, dropping from the 99th and 96th percentiles to the 57th and 69th percentiles, respectively—an area worth monitoring. The only nearby school with a comparable academic profile is Harmony School Of Discovery - Houston, another charter school, making Calvin Nelms a standout choice for families seeking top-tier academics in the Katy area.

183

Students ?

17.5

Student/teacher ratio ?

$8,385

Per pupil spending ?

43.1%

Free/discounted lunch ?

20625 Clay Rd
Katy, TX 77449

(281) 398-8031

District: Calvin Nelms Charter Schools

Racial breakdown:

Hispanic:

60.7%

White:

15.8%

African American:

15.8%

See top rated Texas high schools

Compare Calvin Nelms High School to nearby high schools!

At a glance

▬ Ranking trend: Holding steady — 86th percentile in 2016 → 90th in 2026

Strengths

✓Test scores above the Texas average (81% vs 62% meeting standards)

✓Ranks in the top 10% of Texas high schools

✓100% graduate within 4 years

Worth a look

!Some student groups rank well below the school's overall statewide standing

Students meeting standards (2025-2026) ?

This school81%

District avg83%

Texas avg62%

201^st of 2,009

Texas public high schools ?

Top 10%▲ up 4 pts since 2016

From top 14% (2016) to top 10% (2026)

See the entire ranking list of Texas High Schools →

★★★★★

SchoolDigger rating ?

57^th of 951Calvin Nelms Charter Schools among Texas districts

Statewide rank percentile over time (100 = the top-ranked school in the state; click a legend item to add a student group)

Show full rank history (all student groups)

All Students

Year	Avg score	Statewide rank	Texas percentile	Rating
2026	80.7	201 of 2009	90.0%	★★★★★
2025	84.4	147 of 1974	92.6%	★★★★★
2024	82.0	183 of 1990	90.8%	★★★★★
2023	86.7	100 of 1961	94.9%	★★★★★
2022	88.7	75 of 1876	96.0%	★★★★★
2021	83.0	148 of 1861	92.0%	★★★★★
2019	82.2	157 of 1857	91.5%	★★★★★
2018	82.4	154 of 1797	91.4%	★★★★★
2017	78.2	209 of 1777	88.2%	★★★★☆
2016	75.0	240 of 1762	86.4%	★★★★☆
2015	71.9	341 of 1743	80.4%	★★★★☆
2014	58.3	703 of 1734	59.5%	★★★☆☆
2013	47.9	938 of 1652	43.2%	★★☆☆☆
2012	52.3	761 of 1603	52.5%	★★★☆☆
2011	54.2	981 of 1672	41.3%	★★☆☆☆
2010	40.9	1223 of 1568	22.0%	★☆☆☆☆
2009	52.0	934 of 1539	39.3%	★★☆☆☆
2008	42.8	1075 of 1510	28.8%	★☆☆☆☆
2007	32.6	1195 of 1497	20.2%	★☆☆☆☆
2006	49.8	889 of 1430	37.8%	★★☆☆☆
2005	60.8	625 of 1429	56.3%	★★★☆☆
2004	57.5	726 of 1427	49.1%	★★☆☆☆

African American

Year	Avg score	Statewide rank	Texas percentile	Rating
2026	85.2	98 of 1086	91.0%	★★★★★
2024	95.9	27 of 1065	97.5%	★★★★★
2023	91.9	61 of 1069	94.3%	★★★★★
2022	95.0	38 of 1031	96.3%	★★★★★
2021	77.6	138 of 1020	86.5%	★★★★☆
2019	82.6	118 of 1024	88.5%	★★★★☆
2018	91.3	56 of 1013	94.5%	★★★★★

Asian

Year	Avg score	Statewide rank	Texas percentile	Rating
2024	48.6	315 of 530	40.6%	★★☆☆☆
2023	48.4	318 of 525	39.4%	★★☆☆☆

At Risk

Year	Avg score	Statewide rank	Texas percentile	Rating
2022	94.9	37 of 1837	98.0%	★★★★★
2021	90.8	56 of 1829	96.9%	★★★★★
2019	87.8	85 of 1810	95.3%	★★★★★
2018	81.8	135 of 1784	92.4%	★★★★★

English Language Learner

Year	Avg score	Statewide rank	Texas percentile	Rating
2026	55.9	370 of 1195	69.0%	★★★☆☆
2024	85.2	102 of 1437	92.9%	★★★★★
2023	94.0	48 of 1371	96.5%	★★★★★

Female

Year	Avg score	Statewide rank	Texas percentile	Rating
2026	85.1	98 of 1936	94.9%	★★★★★
2024	56.7	685 of 1880	63.6%	★★★☆☆
2023	81.6	160 of 1891	91.5%	★★★★★
2022	78.7	198 of 1841	89.2%	★★★★☆
2021	80.8	178 of 1815	90.2%	★★★★★
2019	79.3	203 of 1798	88.7%	★★★★☆
2018	82.5	152 of 1781	91.5%	★★★★★

Hispanic

Year	Avg score	Statewide rank	Texas percentile	Rating
2026	83.5	134 of 1860	92.8%	★★★★★
2024	82.8	132 of 1805	92.7%	★★★★★
2023	90.6	54 of 1820	97.0%	★★★★★
2022	88.2	86 of 1762	95.1%	★★★★★
2021	88.7	68 of 1743	96.1%	★★★★★
2019	86.1	117 of 1714	93.2%	★★★★★
2018	86.7	103 of 1691	93.9%	★★★★★

Low Socio Economic Status

Year	Avg score	Statewide rank	Texas percentile	Rating
2026	78.4	199 of 1937	89.7%	★★★★☆
2024	67.3	330 of 1884	82.5%	★★★★☆
2023	84.5	121 of 1897	93.6%	★★★★★
2022	91.4	56 of 1847	97.0%	★★★★★
2021	86.9	77 of 1848	95.8%	★★★★★
2019	89.3	80 of 1818	95.6%	★★★★★
2018	85.7	119 of 1794	93.4%	★★★★★

Male

Year	Avg score	Statewide rank	Texas percentile	Rating
2026	76.6	271 of 1954	86.1%	★★★★☆
2024	88.1	80 of 1891	95.8%	★★★★★
2023	88.7	80 of 1913	95.8%	★★★★★
2022	93.0	33 of 1853	98.2%	★★★★★
2021	83.4	147 of 1840	92.0%	★★★★★
2019	82.0	176 of 1824	90.4%	★★★★★
2018	78.0	224 of 1803	87.6%	★★★★☆

Special Education

Year	Avg score	Statewide rank	Texas percentile	Rating
2026	46.9	680 of 1581	57.0%	★★★☆☆
2024	94.8	42 of 1548	97.3%	★★★★★
2023	100.0	9 of 1478	99.4%	★★★★★
2022	100.0	7 of 1418	99.5%	★★★★★
2021	97.7	31 of 1382	97.8%	★★★★★
2019	86.3	79 of 1357	94.2%	★★★★★
2018	43.8	630 of 1347	53.2%	★★★☆☆

White

Year	Avg score	Statewide rank	Texas percentile	Rating
2026	63.9	460 of 1584	71.0%	★★★★☆
2024	80.2	124 of 1556	92.0%	★★★★★
2023	67.2	388 of 1576	75.4%	★★★★☆
2022	93.6	15 of 1525	99.0%	★★★★★
2021	61.9	458 of 1510	69.7%	★★★☆☆
2019	64.3	445 of 1526	70.8%	★★★★☆
2018	59.3	517 of 1539	66.4%	★★★☆☆

How student groups rank statewide ? (each group's percentile vs the same group at other schools — higher is better; the +/- beside each compares the group with this school's overall percentile)

At Risk (2022)98th percentile~ school

Female (2026)95th percentile+5 vs school

Hispanic (2026)93rd percentile+3 vs school

African American (2026)91st percentile~ school

Low Socio Economic Status (2026)90th percentile~ school

Male (2026)86th percentile-4 vs school

White (2026)71st percentile-19 vs school

English Language Learner (2026)69th percentile-21 vs school

Special Education (2026)57th percentile-33 vs school

Asian (2024)41st percentile-50 vs school

By subject vs Texas (2025-2026) ?

U.S. History88%+17 vs state

Biology85%+15 vs state

English II Reading84%+24 vs state

Algebra I83%+29 vs state

English I Reading69%+13 vs state

5.0

1 rating · 1 written review

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What people are saying

by a parent
Monday, April 24, 2017

Awesome teacher student ratio. One on one type education is top notch! The best public school in a private school setting. Getting ready to send my 4th child there in 2017. Close Quote

Schools Near Calvin Nelms High School

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Ranking:

E = Elementary, M = Middle, H = High, A = Alternative, P = Private

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Finance All

School													Students/Teachers											Ranking (2026)				Ranking (2025)				STAAR EOC Algebra I (2026)	STAAR EOC Biology (2026)	STAAR EOC English I Reading (2026)	STAAR EOC English II Reading (2026)	STAAR EOC U.S. History (2026)	STAAR Reading (2026)			STAAR Mathematics (2026)			STAAR Social Studies (2026)	Per Pupil Expenditures (2024)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/Discounted Lunch Recipients	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2026)	Statewide Rank (2026)	State Percentile (2026)	SchoolDigger Rating (2026)	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	Rank Change from Previous Year	STAAR EOC Algebra I End of Course	STAAR EOC Biology End of Course	STAAR EOC English I Reading End of Course	STAAR EOC English II Reading End of Course	STAAR EOC U.S. History End of Course	STAAR Reading 6th Grade	STAAR Reading 7th Grade	STAAR Reading 8th Grade	STAAR Mathematics 6th Grade	STAAR Mathematics 7th Grade	STAAR Mathematics 8th Grade	STAAR Social Studies 8th Grade	Total
Calvin Nelms High School	Public, Charter	9-12	20625 Clay Rd	Katy	77449	Harris County	Calvin Nelms Charter Schools	Yes	No	(n/a)	No	(281) 398-8031	183	10	17.5		29 (15.8%)	29 (15.8%)	111 (60.7%)	7 (3.8%)	0 (0.0%)	0 (0.0%)	7 (3.8%)	80.7	201^st of 2009 public high schools	90.0%		84.4	147^th of 1974 public high schools	92.6%	54	83.3	85.4	68.8	83.6	87.5								$8,385
Morton Ranch High School	Public	9-12	21000 Franz Rd	Katy	77449	Harris County	Katy Independent School District (Isd)	No	No	(n/a)	No	(281) 237-7800	2,944	212	13.9	69.6%	369 (12.5%)	663 (22.5%)	1,694 (57.5%)	127 (4.3%)	11 (0.4%)	4 (0.1%)	76 (2.6%)	49.6	959^th of 2009 public high schools	52.3%		49.7	920^th of 1974 public high schools	53.4%	39	34.5	72.2	54.9	59.9	71.3								$10,087
Cypress Lakes High School	Public	9-12	5750 Greenhouse Rd	Katy	77449	Harris County	Cypress-Fairbanks Independent School District (Isd)	No	No	(n/a)	No	(281) 856-3800	3,175	214	14.8	73.4%	192 (6.0%)	873 (27.5%)	1,817 (57.2%)	179 (5.6%)	27 (0.9%)	4 (0.1%)	83 (2.6%)	49.3	967^th of 2009 public high schools	51.9%		48.8	942^nd of 1974 public high schools	52.3%	25	41.1	69.1	55.5	55.7	73.1								$8,017
Paetow High School	Public	9-12	23111 Stockdick School Rd	Katy	77493	Harris County	Katy Independent School District (Isd)	No	No	(n/a)	No	(281) 234-4906	3,447	233	14.8	64.7%	381 (11.1%)	1,112 (32.3%)	1,538 (44.6%)	263 (7.6%)	5 (0.1%)	10 (0.3%)	138 (4.0%)	56.5	779^th of 2009 public high schools	61.2%		56.9	750^th of 1974 public high schools	62.0%	29	52.9	76.3	58.9	59.8	72.1								$8,519
Mayde Creek High School	Public	9-12	19202 Groschke Rd	Houston	77084	Harris County	Katy Independent School District (Isd)	No	No	(n/a)	No	(281) 237-3063	3,036	213	14.2	76.5%	313 (10.3%)	624 (20.6%)	1,820 (59.9%)	179 (5.9%)	14 (0.5%)	2 (0.1%)	84 (2.8%)	49.3	969^th of 2009 public high schools	51.8%		45.6	1028^th of 1974 public high schools	47.9%	59	59.0	68.4	55.2	50.3	70.5								$9,909
Alternative Learning Center - West	Public	6-12	19350 Rebel Yell	Katy	77449	Harris County	Cypress-Fairbanks Independent School District (Isd)	No	No	(n/a)	No	(281) 855-4310	0	33	.0		0 ()	0 ()	0 ()	0 ()	0 ()	0 ()	0 ()								(n/a)
Taylor High School	Public	9-12	20700 Kingsland Blvd	Katy	77450	Harris County	Katy Independent School District (Isd)	No	No	(n/a)	No	(281) 237-3100	3,384	209	16.2	41.7%	1,256 (37.1%)	322 (9.5%)	1,186 (35.0%)	481 (14.2%)	5 (0.1%)	0 (0.0%)	134 (4.0%)	79.7	217^th of 2009 public high schools	89.2%		80.8	212^th of 1974 public high schools	89.3%	5	67.4	86.2	76.0	77.6	88.4								$8,808
Cypress Park High School	Public	9-12	7425 Westgreen Blvd	Cypress	77433	Harris County	Cypress-Fairbanks Independent School District (Isd)	No	No	(n/a)	No	(281) 897-4000	3,117	195	16.0	71.5%	172 (5.5%)	913 (29.3%)	1,785 (57.3%)	152 (4.9%)	15 (0.5%)	6 (0.2%)	74 (2.4%)	52.4	891^st of 2009 public high schools	55.6%		52.4	851^st of 1974 public high schools	56.9%	40	34.8	73.2	55.1	59.3	76.0								$7,913
Harmony School Of Discovery - Houston	Public, Charter	6-12	6270 Barker Cypress Rd	Houston	77084	Harris County	Harmony Public Schools - Houston North	Yes	No	(n/a)	Yes	(281) 861-5105	858	54	15.8	73.7%	127 (14.8%)	205 (23.9%)	349 (40.7%)	161 (18.8%)	6 (0.7%)	0 (0.0%)	10 (1.2%)	82.8	159^th of 2009 public high schools	92.1%		89.5	70^th of 1974 public high schools	96.5%	89	90.9	86.3	80.7	79.2	83.2	76.4	72.0	84.6	73.3	55.4	80.3	43.6	$11,927
Cypress Springs High School	Public	9-12	7909 Fry Rd	Cypress	77433	Harris County	Cypress-Fairbanks Independent School District (Isd)	No	No	(n/a)	No	(281) 345-3000	2,800	189	14.8	69.4%	188 (6.7%)	1,041 (37.2%)	1,284 (45.9%)	179 (6.4%)	18 (0.6%)	3 (0.1%)	87 (3.1%)	48	995^th of 2009 public high schools	50.5%		43.1	1082^nd of 1974 public high schools	45.2%	87	39.2	62.1	54.9	60.6	72.5								$8,207

Frequently Asked Questions about Calvin Nelms High School

Is Calvin Nelms High School a good school?

Calvin Nelms High School ranks 201^st of 2009 Texas high schools. SchoolDigger rates this school 5 stars out of 5.

What district is Calvin Nelms High School in?

Calvin Nelms Charter Schools

What is the racial makeup of Calvin Nelms High School?

Students at Calvin Nelms High School are 61% Hispanic, 16% White, 16% African American, 4% Asian, 4% Two or more races.

How many students attend Calvin Nelms High School?

In the 2024-25 school year, 183 students attended Calvin Nelms High School.

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SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the Texas Education Agency.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.