Click on "inches" to change the ruler units from pixels to inches. Click on the units button again and change the ruler's units to centimeters instead.

Learn how to change Ruler unit in Word, Excel, PowerPoint from default inches to cm, mm, points, picas via Settings, Registry or Group Policy Editor.

Traditional Uses 72.27 points per inch, as traditionally used in printing. How to use the Ruler Tool in Photoshop The ruler tool is located on the left tools panel.