Fitts' Law Calculator
Explore Fitts' Law interactively
Overlay for Fitts' law measurement and UX tinkering.
A Chrome extension that overlays visual tools for exploring Fitts' law — the relationship between target size, distance, and interaction time in user interfaces. It sits alongside an interactive visualisation of Shannon's formulation of Fitts' Law, showing how the time to reach a target changes with distance and approach angle.
Not yet published on the Chrome Web Store.
How to use it
- Install the extension
- Click the Fitts' Law Overlay icon in your toolbar
- An overlay appears on the page to help you measure or visualise interface elements
- Use it to experiment with target sizes, distances, and interaction costs
Built for UX designers, researchers, and anyone curious about interaction design fundamentals.