Determining the Fractional Scale of a Map or Scale Model

The fractional scale of a scale model is the ratio between two sets of
dimensions (as between those of a model car and its equivalent actual
car). The formula for determining the fractional scale of a map or scale
model is:

"AS" and "MS" should be in the same units, e.g., cm, so that the units 
will cancel.

Example: If a model car is 20cm long, and the actual car is 3m long, then 
what is the scale of the model car?

Therefore, one unit on the model is equivalent to 15 of the same units in
the real world. Every feature on the model is 1/15 of actual size; every
feature on the actual car is 15 times larger than the same model feature.

Copyright © 1997-2012 by Walter Sanford. All rights reserved.

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