PDF (adobe.com)

Change the unit of measurement

  1. Do one of the following:

    • Double-click a ruler.

    • (Windows) Choose Edit > Preferences > Units & Rulers, or right-click the ruler and then choose a new unit from the context menu.

    • (Mac OS) Choose Photoshop > Preferences > Units & Rulers, or Control-click the ruler and then choose a new unit from the context menu.

  2. For Rulers, choose a unit of measurement.
    Note: Changing the units on the Info panel automatically changes the units on the rulers.
  3. For Point/Pica Size, choose from the following options:
    PostScript (72 points per inch)
    Sets a unit size compatible for printing to a PostScript device.

    Traditional
    Uses 72.27 points per inch, as traditionally used in printing.

  4. Click OK.