Postal address
14785 TUMBA
Hammerstaskolan
After-school care, Compulsory school, Preschool class — Year 1–9 in Botkyrka , Stockholms län
6 values has limited history
This applies only to the values listed here.
There is still too little history to interpret the trend safely.
This affects
- Anti-bullying year 8
- Cost per student
- Permanently employed teachers
- Safety year 8
- Study environment year 8
- Number of pupils
- The school survey relies on voluntary responses and results can vary substantially between years for small samples.
- Costs are affected by accounting practices, rent levels, and service mix, and should mainly be compared across similar school types.
- This staffing metric is affected by FTE definitions, local reporting practices, and temporary vacancies.
- Pupil counts may be privacy-suppressed for small units and are not always updated on the same cadence as other indicators.
Other values here do not have this specific note.
Hammerstaskolan is a compulsory school in Botkyrka, Stockholms län. The school has 420 pupils and 12.5 pupils per teacher. Average merit value in year 9 is 228.6 points. 49.4% of teachers are qualified. Provider: Botkyrka kommun.
Statistics: school year 2023/24. Source: Skolverket, SCB, Kolada. Glossary · About the data. For the full Swedish profile with surveys, trend charts and extended commentary, you can also open the Swedish school page.
Warning signals
Objective assessment based on statistics — not a quality stamp. Glossary.
Low share of qualified teachers 49%
49% qualified teachers — significantly below the national average (73%).
High absence 782160%
782160% of pupils have more than 20% unauthorised absence.
Near average
compared to national averages Merit value yr 9
228.6 ↓
National: 227.2 Municipality: 234.4
Pupils/teacher
12.5 →
National: 12.1 Municipality: 14.0
Qualified teachers
49.4% ↑
National: 73.2% Municipality: 44.6%
Eligible for upper secondary
84.3% ↑
National: 86.1%
School National Municipality
Student support services in Botkyrka
Municipality-level data on student health and support resources. Source: Kolada and the Schools Inspectorate.
View all key figures for Botkyrka · Source: Kolada
After-school care in Botkyrka
Municipality-level key figures for after-school care (fritidshem) in Botkyrka. The data covers the entire municipality and may differ from this specific unit.
View all key figures for Botkyrka · Source: Kolada
Staff & stability
Staff stability and qualification data, shown first at school level and then at municipality level.
This school
Indicator based on the share of permanently employed, senior and qualified teachers. The school has moderate staff stability.
Medium
Teacher turnover: 13.4% — share of teachers who left or joined during the year
Municipal average qualified teachers: 44.6% (national: 73%).
A high share of permanently employed and qualified teachers indicates a more stable staff situation. Source: Skolverket Statistical Database.
Municipality
How stable the teaching workforce is in the municipality, measured as the trend in the share of qualified teachers over time. Municipality-level data from Kolada. School-specific trend is shown above under This school.
Trend: qualified teachers in Botkyrka (%)
2020: 61.5% 2024: 68%
Merit value vs. expected (SALSAStatistical model adjusting results for student demographics) ⓘ
SALSA compares the school's actual merit value with a modelled value based on pupil composition. School year 2024/25.
229 Actual merit value
197 Modelled value
+31.0
School's own contribution (2024/25)
Municipality avg. (Botkyrka): +18.9
−60 0 +60
✓ High certainty
Standard uncertainty: ±0.7 points
(420 pupils)
Large school — the SALSA score is statistically stable.
Large school — the SALSA score is statistically stable.
SALSA measures relative performance — not absolute school quality. The model explains approx. 53% of variation; the rest depends on factors like leadership, teaching, resources and pupil selection not captured by the model.
Background variables in the model
Positive SALSA score = higher results than expected given pupil composition. Source: SIRIS/Skolverket. Read more about SALSA.
Schools with similar pupil composition
Schools with similar SALSA background variables (parents' education, recently immigrated, gender). Shows how Hammerstaskolan performs compared to schools with similar conditions.
+31.0 Performs above expectations
Better SALSA score than 12 of 15 comparison schools
Average SALSA score among comparison schools: +15.5
| School | Municipality | Merit value | SALSA score | Qualified teachers |
|---|---|---|---|---|
| Hammerstaskolan | Botkyrka | 229 | +31.0 | 49.4% |
| Bjurbäcksskolan 7-9 | Emmaboda | 216 | +15.0 | 74.7% |
| Nya Skolan, Lilla Edet | Lilla Edet | 227 | +26.0 | 47.3% |
| Botkyrka Friskola F-9 | Botkyrka | 258 | +55.0 | 52% |
| Slottsskolan | Borgholm | 220 | +8.0 | 63.3% |
| Odenskolan | Örebro | 175 | -31.0 | 47.5% |
| Albäcksskolan 2 | Hultsfred | 200 | -8.0 | 48.7% |
| Communityskolan Tynnered | Göteborg | 221 | +26.0 | 54.6% |
| Kunskapsskolan Motala | Motala | 206 | -7.0 | 59.4% |
| Innovitaskolan Landskrona | Landskrona | 188 | -4.0 | 46.7% |
| Vallonskolan | Östhammar | 198 | -12.0 | 53.8% |
| Vittra Västra hamnen | – | 224 | +19.0 | – |
| Freinetskolan Kastanjen | Botkyrka | 269 | +59.0 | 49.3% |
| Vittangi skola | Kiruna | 264 | +55.0 | 42.1% |
| Grundskola Överkalix kommun | Överkalix | 204 | +7.0 | 51.9% |
| Järvaskolan | Stockholm | 216 | +24.0 | 57.7% |
SALSA score = actual merit value minus SALSA model's expected value. Positive (green) = better than expected. Source: SIRIS/Skolverket. School year 2024/25.
Statistics
Quality dataQuality and finance (Skolverket Statistical Database)
Costs, personnel data and school survey results from Skolverket's quality system.
Costs per pupil
Personnel
Absence
School survey (agree, %)
Share of pupils who fully or partly agree. Voluntary survey with varying response rates.
Demographics & safety
Pupil demographics
Safety in the municipality
Reported crimes at municipality level — not school-specific. Source: Kolada.
Basic informationAbout the school
Contact
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View contact details on Skolverket →
Addresses
Inspection and review
The Schools Inspectorate (Skolinspektionen) is responsible for supervision and quality reviews of schools in Sweden.
Search for Hammerstaskolan at the Schools Inspectorate →
Full inspection decisions, injunctions and quality reviews are available from the Schools Inspectorate.
Nearby grundskolor
Geographically nearest schools of the same type, regardless of municipality.
Compare these schools →Similar grundskolor in Stockholms län
Compare similar schools →Related
Keep exploring this school through its provider, group, municipality, and the most relevant statistics pages.
Schools in BotkyrkaOpen the municipality page with all schools, rankings, and local aggregates.Botkyrka kommunSee all schools, municipalities, and core metrics for the same provider.Stockholms länCompare municipalities and school patterns across the whole county.Merit value year 9Compare year-9 merit values across municipalities and school environments.Certification vs Merit valueSee how merit values and upper-secondary eligibility move together.School size by school typeSee how school forms and unit sizes are distributed nationally.School type distributionCompare how school forms are distributed across municipalities and operators.Compare schoolsBuild a side-by-side comparison with the schools you care about.
Watch this school
Get notified by email when new statistics are published, merit scores change significantly, or the School Inspectorate issues a new decision.
Statistics: school year 2023/24. Source: Skolverket, SCB, Kolada.
Glossary · About the data.
— = data not available from source.
