Scale

Shortcut "S"

This command asks for an object to scale, then a base point and a scale factor. Instead of entering the "Scale" factor, right mouse click to see the following options:

Reference by X

This option automatically calculates the scale factor. Enter the outermost size in X.

Reference by Y

This option automatically calculates the scale factor. Enter the outermost size in Y.

Reference

Asks for a reference length and then a new length. All objects will be scaled by reference to this length.

Non-uniform

Define a scale factor in X and in Y. An input of 2, 3 will make the object two times the original size in X and three times in Y.

Box scale

This option lets different entries for the outermost size in X and Y. In this option it is best to have the zero point at the lower left corner of the selected objects.