The Skolkoll score is a composite quality metric that combines five dimensions into a single number between 0 and 100. The purpose is to give a quick overview of a school's combined strengths — not to rank schools exactly, but to help parents and professionals identify patterns and make fair comparisons.
The five dimensions
| Dimension | Weight | Source | What it measures |
|---|---|---|---|
| Results | 30 % | Skolverket | Percentile rank of the school's Year 9 final-grade score (compulsory) or graduation rate (upper-secondary) versus all schools of the same type. |
| Staff | 25 % | Skolverket | Percentile rank for share of certified teachers versus all schools of the same type. |
| Value-added | 20 % | SALSA/Skolverket | The gap between actual and expected final-grade score (SALSA residual), normalised 0–100. Compulsory schools only. |
| Safety | 15 % | Schools survey | Safety index (0–100) computed from safety, study calm, anti-bullying and staff assessment. |
| Resources | 10 % | Skolverket | Teacher density (pupils per teacher) percentile rank. Lower ratio = higher score. |
How the calculation works
- Each dimension is normalised to 0–100 via percentile ranking among all schools of the same type (compulsory or upper-secondary).
- The dimensions are weighted together using the weights above. If a dimension is missing (e.g. Value-added for upper-secondary schools), it is excluded and the remaining weights scale up proportionally.
- The result is a weighted mean, rounded to a whole number.
What is a good Skolkoll score?
Because every dimension is percentile-based, an average school lands around 50. A score of 65+ means the school sits above average on most dimensions. A score below 40 signals there are areas for improvement, but should always be read in context — a school facing difficult conditions can perform excellently relative to its situation (see the Value-added dimension).
Confidence level
The score carries a confidence level: High (4–5 dimensions with actual data), Moderate (3 dimensions), Low (1–2 dimensions). Schools with fewer dimensions are harder to compare — a score based on just 2 dimensions needs to be read with caution.
Transparency
All weights and computations are open. Each school page shows the individual dimension values alongside the total. Source data comes from Skolverket, SCB and the Swedish Schools Inspectorate's survey. No paying customer can influence how the score is calculated.
When data is missing (fallback)
Every school always gets exactly 5 dimensions. If a dimension lacks school-specific data the neutral value 50 is used as a fallback. Dimensions with a fallback value are marked with * and a striped bar. The number of dimensions with actual data is shown next to the score.
Common reasons for missing data and what can be done about them:
- Value-added (SALSA): Only compulsory schools with Year 9 and a sufficient pupil base receive SALSA values. Skolverket publishes SALSA each February. If a school is missing SALSA, verify that grade statistics are correctly reported to SIRIS.
- Safety: Requires the school to take part in the Schools Inspectorate survey (Skolenkäten). Contact Skolinspektionen if the school is not receiving the survey.
- Results: Published via Skolverket's statistics database. Ensure the school's results data is reported on time.
- Staff/Resources: Sourced from Skolverket's personnel and cost statistics. Ensure the school unit is correctly registered in the School Unit Register.