diff --git a/src/managers/AllDayManager.ts b/src/managers/AllDayManager.ts
index 0d5d533..a813cb8 100644
--- a/src/managers/AllDayManager.ts
+++ b/src/managers/AllDayManager.ts
@@ -178,20 +178,20 @@ export class AllDayManager {
     let maxRows = 0;
 
     if (allDayEvents.length > 0) {
-      // Track which rows are actually used by checking grid positions
-      const usedRows = new Set<number>();
+      // Find the HIGHEST row number in use (not count of unique rows)
+      let highestRow = 0;
 
       (Array.from(allDayEvents) as HTMLElement[]).forEach((event: HTMLElement) => {
         const gridRow = parseInt(getComputedStyle(event).gridRowStart) || 1;
-        usedRows.add(gridRow);
+        highestRow = Math.max(highestRow, gridRow);
       });
 
-      // Max rows = highest row number in use
-      maxRows = usedRows.size > 0 ? Math.max(...usedRows) : 0;
+      // Max rows = highest row number (e.g. if row 3 is used, height = 3 rows)
+      maxRows = highestRow;
 
-      console.log('🔍 AllDayManager: Height calculation', {
+      console.log('🔍 AllDayManager: Height calculation FIXED', {
         totalEvents: allDayEvents.length,
-        usedRows: Array.from(usedRows).sort(),
+        highestRowFound: highestRow,
         maxRows
       });
     }