To convert from inches to centimeters enter 2.54 (there are 2.54 centimeters per inch).
Enter a base point of *0,0.Scaling will be relative to the world coordinate system (WCS) origin and the location of the drawing origin will remain at the WCS origin.At the Select Objects prompt, enter all.If you start a drawing in one system of measurement (imperial or metric) and then want to switch to the other system, use SCALE to resize the model geometry by the appropriate conversion factor to obtain correct distances and dimensions. How to Scale All drawing objects to Change Unit How to Calculate the Scale of Annotation Objects in Model Space.How to Scale Annotation Objects in AutoCAD?.How to Scale Selected Objects in AutoCAD?.How to Scale All drawing objects to Change Unit.