Use rulers

When rulers show, they appear along the top and left sides of the document. You can change the unit of measure used in the rulers from the default of pixels to another unit. When you move an element on the Stage with the rulers displayed, lines indicating the element’s dimensions appear on the rulers.

• To show or hide rulers, select View > Rulers.

• To specify the rulers’ unit of measure for a document, select Modify > Document, and select a unit from the Ruler Units menu.