# 2.2.1 Change Scale

Change Scale is used to change the size and gauge of selected (Section 2.2.14) objects. The amount to resize can be specified

- by the modeling scale, e.g., convert from HO to O scale
- by the modeled gauge, e.g., convert from standard gauge to narrow gauge, or
- by ratio (by 181.5%).

If resizing by modeling scale then track dimensions, e.g., lengths and radii, will be changed as well. An option is available to disable the resizing of the selected objects.