What tool can be used to calculate reduction and enlargement percentages?

The Proportion Wheel is specifically designed to assist in calculating reduction and enlargement percentages in graphic design and illustration. This tool allows users to easily visualize and determine the scale factors needed for resizing images or designs. By rotating the wheel, users can see the relationship between the original size and the desired size, which provides a direct percentage of reduction or enlargement.

Using the Proportion Wheel is advantageous because it simplifies the process of finding scaling factors without the need for complex calculations. It is particularly useful in graphic design, where achieving the proper dimensions while maintaining the proportions of an image or design is crucial.

Other tools, while potentially useful in related contexts, do not serve the same specific function. For instance, a scale ruler is primarily used for measuring and drawing to scale, rather than calculating percentages directly. A measurement guide provides overall guidance on dimensions but lacks the direct interactive functionality of a Proportion Wheel. A conversion chart offers conversions for numerical values but does not necessarily facilitate understanding of enlargements or reductions visually in the context of design.