Fitts's Law

Summary

The time to reach a target depends on its size and distance — bigger, closer targets are faster and easier to hit, which is why frequently-used buttons should be large and conveniently placed.

• 1Identify a frequently-used but too-small tap target in an app you use.
• 2Apply Fitts's Law to justify the size and placement of a primary call-to-action button.
• 3Learn why this law is especially important for mobile touch targets and accessibility.