This is a complete, single-file, premium-grade UI/UX application. ```html Free Fitts's Law UI/UX Target Size & Movement Time Calculator

Fitts's Law Calculator

Analyze target size and movement time for optimal UI performance.

Calculator A

Distance (D)

Width (W)

Start/Stop Time (a)

0ms

Movement Speed (b)

150ms

Difficulty (ID)

0.00

Movement Time (MT)

0 ms

Calculator B (Compare)

Distance (D)

Width (W)

Start/Stop Time (a) 0ms

Movement Speed (b) 150ms

Difficulty (ID)

0.00

Movement Time (MT)

0 ms