Thumb Reach Heatmap Matrix

Physical limits of standard hand sizes on 6.5"+ screens.

As average smartphone screens stretch beyond 6.5" diagonally with 20:9 aspect ratios, the "Thumb Zone" (first proposed by Steven Hoober) has physically collapsed.

Over 60% of the screen area is now inaccessible to a single-handed bottom grip without shifting the device or risking a drop.

Ergonomic Action Placements
  • Top 20%: Destructive/Rare actions (Settings, Logout)
  • Middle 40%: Read-only content, scroll origin
  • Bottom 40%: Core navigation, Primary CTAs