Recommend Screen Protractor Mac Edition 3.2

The Screen Protractor allows you to easily and quickly measure any angle on the screen to the nearest Degree or Radian. This perfect compliment to the Screen Calipers, the Protractor is simple and easy to use with any program.

By rotating the slider points to fit your design, sketch or diagram any angle can be calculated, in any engineering unit that you need. You can also perform simple calculations like multiplying the angle.