Calibrating Scale and Measuring Drawings

1. 1

   Find a known dimension

   Use a labelled wall, grid line, door width, scale bar, or other dimension printed on the drawing.

2. 2

   Open calibration

   Choose Set Scale from the toolbar or press S, then click the two endpoints of the known distance.

3. 3

   Enter the real length

   Type the real-world length and unit shown on the drawing. Scale is stored per page, so each sheet in a mixed-scale set can have its own calibration.

1. 1

   Choose a measurement tool

   Select Measure Distance (M), Measure Area (P), Perimeter (Shift+N), or Measure Volume (Shift+V) from the toolbar. If the page is not calibrated yet, the tool prompts you to set scale first.

2. 2

   Trace the object

   Click the endpoints or boundary points on the drawing. Complete polygon-style measurements by closing the shape.

3. 3

   Review the value

   The measured value appears on the markup and in the Measurements panel. Editing the geometry recalculates the quantity.

Recalibrate if the page scale changes, the drawing was scanned at the wrong size, a page was rotated or replaced, or one PDF contains pages with different sheet sizes or drawing scales.