There are 2 ways to scaling a drawing in Autocad, Scaling by Factor and Scaling by Reference.

This tutorial will show you how to scale using Factor, you can read how to scale using Reference.

1 Open an AutoCAD file with lines/objects/groups/blocks/images that you can scale. If it’s a new file, just draw a line or insert an image.

Image titled Scale in AutoCAD Step 1

2 Select what you want to scale. 

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3 Find the scale option. You can type “sc” or “scale” and press the spacebar/enter button, or in the ribbon, in the modify tab, find the Scale button (It’s a blue square with a smaller grey square in the bottom left corner. If it’s not in your modify tab, click the drop down arrow for more modify options.)

Image titled Scale in AutoCAD Step 3

4 Specify your base point when asked. Your base point can be on the object itself or it can be anywhere in the workspace. You can even click a point on another object to use as a base point. You can for example select the edge of something, or the midpoint. Select your base point by clicking on it.

Image titled Scale in AutoCAD Step 4

5 Specify your scale factor. Using method 1 (scaling by a factor), you can now type a number (a scale factor) and press spacebar/enter. Your object will change size according to that number. If you use decimals, the thing you want to scale will become smaller. Voila! You’re done!

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Alternatively, you can scale by moving your cursor around. When you find a size that you want, just left click on the mouse to enter. This step makes it very difficult to scale down though.

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