Average government primary school class sizes by school size (2009-2024)

The class size audit is conducted in all NSW government primary, infant and central (primary grades only) schools in March each year.

### Data notes
* Students attending schools for specific purposes (SSPs), students in support classes in regular schools and distance education students are excluded from average class size calculations.

* The average class size for each year level is calculated from regular and multi-age classes that contain a student from that year level. This can result in a lower K-6 average class size than any individual year level.

* From 2017, school size is based on primary enrolment rather than school classification.

* Data from earlier years is not replaced in the Class Size fact sheet. Schools change size. Historical data displays the data that was correct in that year.

* Refer to the individual class size factsheet publication for further information and policy context.

### Data source
Education Statistics and Measurement Unit, Centre for Education Statistics and Evaluation.

### Data quality statement
The [Class Size Audit Data Quality Statement](https://metadata.nsw.gov.au/item/13132/qualitystatement/class-size-audit-data-quality-statement) addresses the quality of the Class Size Audit dataset using the dimensions outlined in the NSW Department of Education's data quality management framework: institutional environment, relevance, timeliness, accuracy, coherence, interpretability and accessibility. It provides an overview of the dataset's quality and highlights any known data quality issues.