# ZOOMFACTOR System Variable [GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) → [System Variables](Help%20System/GSTARCAD/2026/System%20Variables/(System%20Variables).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. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables/ZOOMFACTOR.html) · © Gstarsoft Co., Ltd.