Change the drawing scale to resize all objects.
Scaling will be relative to the world coordinate system (WCS) origin and the location of the drawing origin will remain at the WCS origin.
For example, to convert from inches to centimeters enter 2.54 (there are 2.54 centimeters per inch). Or, to convert from centimeters to inches enter 0.3937 (the inverse of 2.54 centimeters per inch).