# ZOOMFACTOR System Variable [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [System Variables](Help%20System/GSTARCAD/2021/System%20Variables/(System%20Variables).md) → [Z](Help%20System/GSTARCAD/2021/System%20Variables/Z/(Z).md) **Function Description:** The ZOOMFACTOR system variable is used to control how much the magnification changes when the mouse wheel moves forward or backward. | | | | --- | --- | | Type | Integer | | Saved in | Registry | | Initial value | 60 | | Range | 3 \~ 100 | The larger of the value, the greater of the change. --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/Z/ZOOMFACTOR%20System%20Variable--b776c9cdcf26.md) · [GstarCAD 2017](Help%20System/GSTARCAD/2017/System%20Variables/Z/ZOOMFACTOR%20System%20Variable--b776c9cdcf26.md) · [GstarCAD 2018](../../../2018/System%20Variables/Z/ZOOMFACTOR%20System%20Variable--b776c9cdcf26.md) · [GstarCAD 2019](../../../2019/System%20Variables/Z/ZOOMFACTOR%20System%20Variable--b776c9cdcf26.md) · [GstarCAD 2020](../../../2020/System%20Variables/Z/ZOOMFACTOR%20System%20Variable--b776c9cdcf26.md) · [GstarCAD 2022](Help%20System/GSTARCAD/2022/System%20Variables/Z/ZOOMFACTOR%20System%20Variable--b776c9cdcf26.md)