diff --git a/hdyc-svelte/src/lib/data/calculators.ts b/hdyc-svelte/src/lib/data/calculators.ts
index 9b4c474..8ed026b 100644
--- a/hdyc-svelte/src/lib/data/calculators.ts
+++ b/hdyc-svelte/src/lib/data/calculators.ts
@@ -22,7 +22,7 @@ export const categories: Record<string, { label: string; icon: string }> = {
   temperature:     { label: 'Temperature',         icon: '🌡️' },
   volume:          { label: 'Volume',              icon: '🧪' },
   fluids:          { label: 'Fluids',              icon: '💧' },
-  area:            { label: 'Area',                icon: '🟦' },
+  area:            { label: 'Area',                icon: '🔳' },
   speed:           { label: 'Speed / Velocity',    icon: '💨' },
   pressure:        { label: 'Pressure',            icon: '🔽' },
   energy:          { label: 'Energy',              icon: '⚡' },