Scaletron

Scaletron! is a scaling calculator, an electronic version of the old graphic arts proportion wheel, used for calculating enlargements and reductions.

In addition to calculating width and height, version 3 of Scaletron! can calculate the effective resolution of scaled images or artwork. Perfect for graphic artists, digital photographers, web designers, scanner operators and prepress technicians.
What's new in this version:
Optionally calculates scaled image resolution! New Preferences menu, allows you to work the way you want! Optionally remembers window position between launches! Cool NEW gigantic 128 x 128 pixel icon!