The Screen Calculator is an Android application developed by Russell Waterson. It is a free utility and tool app that caters to your screen measuring and comparison needs. Whether you're a developer, designer, or architect, this app has the necessary features to calculate and compare screen measurements, aspect ratios, diagonal sizes, and pixel densities in DPI/PPI. The app also allows you to view the exact specifications of your device's screen, including dimensions, resolution, refresh rate, and HDR support. The Screen Calculator is ad-free and offers unlimited size and DPI entries for endless comparisons.

The app's main features include the ability to calculate and compare the measurements of a screen using its aspect ratio, diagonal size, or horizontal and vertical sides. The compare feature presents a visual representation of your saved screen sizes, allowing you to directly compare them with each other. Additionally, you can calculate and compare the pixel density in DPI/PPI of a screen from its size and resolution. The app's pro features, accessible through an in-app purchase, include an ad-free experience and unlimited size and DPI entries for endless comparisons.