Measure Distance & Angle in Blender

Blender 2.79

To create and edit measurement Rulers & Protractors:

  1. In the Tool Shelf > Grease Pencil,
    Press Ruler/Protractor to activate Ruler/Protractor mode.
  2. LMB Click & Drag the 3D Viewport to create a measuring Ruler.
    * Hold Ctrl while creating the Ruler to snap its start and end points to 3D elements.
    * If a one or more measuring Rulers already exist, Ctrl must be held anyway to create a new Ruler.
  3. LMB Click & Drag along an existing Ruler line to turn it into a Protractor for angle measurement.
    * Hold Ctrl while creating the Protractor to snap its apex to 3D elements.
  4. LMB Click & Drag a point in an existing Ruler or Protractor to change its location.
  5. LMB Click an existing Ruler or Protractor and Press Delete to delete it.
  6. When finished creating measurement Rulers & Protractors,
    Press Enter to save them for later use of the Ruler/Protractor mode,
    Or Press Escape to discard them (without discarding Rulers / Protractors that were previously saved).






To Delete all Ruler / Protractor data:
In the Properties Panel > Grease Pencil Layers,
Delete the RulerData3D Layer.