Use rulers

Rulers help you accurately place and measure objects in the illustration window or in an artboard. The point where 0 appears on each ruler is called the ruler origin.

Document rulers appear at the top and left sides of the illustration window. The default ruler origin is located at the lower-left corner of the illustration window.

Artboard rulers appear at the top and left sides of the active artboard. The default artboard ruler origin is located at the lower-left corner of the artboard.

To show or hide rulers, choose View > Show Rulers or View > Hide Rulers.
To show or hide artboard rulers, choose View > Show Artboard Rulers or View > Hide Artboard Rulers.
To change the ruler origin, move the pointer to the upper-left corner where the rulers intersect, and drag the pointer to where you want the new ruler origin.
As you drag, a cross hair in the window and in the rulers indicates the changing ruler origin.

Note: Changing the ruler origin affects the tiling of patterns.
To restore the default ruler origin, double-click the upper-left corner where the rulers intersect.