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Drawing scale factor is a single number that represents a multiplier, such as 96, 20, or 0.5. The drawing scale factor for a drawing is the conversion factor between a measurement on the plot and a measurement in the real world.

The “Drawing scale versus drawing scale factor” sidebar explains how you arrive at the scale factor, but this isn’t an issue until it comes time to annotate your drawing. I cover noncontinuous linetype scaling in ssss1, text sizing in ssss1, dimensions in ssss1, and crosshatching in ssss1. The good news is that AutoCAD can now take care of all this automatically, but a well-placed rumor has it that there may still be a few drawings out there that did it the old way, so I cover both methods in the appropriate chapters.

ssss1 lists some common architectural drawing scales, using both imperial and metric systems of measure. The table also lists the drawing scale factor corresponding to each drawing scale and the common uses for each scale. If you work in industries other than those listed here, ask drafters or coworkers what the common drawing scales are and for what kinds of drawings they’re used.