diff --git a/home/roles/aerospace/default.nix b/home/roles/aerospace/default.nix
index 7a7a1eb..486158d 100644
--- a/home/roles/aerospace/default.nix
+++ b/home/roles/aerospace/default.nix
@@ -599,21 +599,28 @@ in
     };
 
     # SketchyBar memory monitoring plugin
+    # Shows actual memory pressure (excludes file cache/inactive pages)
     home.file.".config/sketchybar/plugins/memory.sh" = mkIf cfg.sketchybar.enable {
       executable = true;
       text = ''
         #!/bin/bash
 
-        MEMORY_STATS=$(vm_stat)
-        PAGES_FREE=$(echo "$MEMORY_STATS" | grep "Pages free" | awk '{print $3}' | tr -d '.')
-        PAGES_ACTIVE=$(echo "$MEMORY_STATS" | grep "Pages active" | awk '{print $3}' | tr -d '.')
-        PAGES_INACTIVE=$(echo "$MEMORY_STATS" | grep "Pages inactive" | awk '{print $3}' | tr -d '.')
-        PAGES_WIRED=$(echo "$MEMORY_STATS" | grep "Pages wired down" | awk '{print $4}' | tr -d '.')
-        PAGES_COMPRESSED=$(echo "$MEMORY_STATS" | grep "Pages stored in compressor" | awk '{print $5}' | tr -d '.')
-
-        TOTAL_PAGES=$((PAGES_FREE + PAGES_ACTIVE + PAGES_INACTIVE + PAGES_WIRED + PAGES_COMPRESSED))
-        USED_PAGES=$((PAGES_ACTIVE + PAGES_INACTIVE + PAGES_WIRED + PAGES_COMPRESSED))
-        MEMORY_PERCENT=$((USED_PAGES * 100 / TOTAL_PAGES))
+        # Use awk for all arithmetic to avoid bash integer overflow on large RAM systems
+        # Memory pressure = Anonymous (app memory) + Wired + Compressor RAM
+        # - Anonymous pages: app-allocated memory (heap, stack) - matches Activity Monitor's "App Memory"
+        # - Wired: kernel/system memory that can't be paged out
+        # - Pages occupied by compressor: actual RAM used by compressor (NOT "stored in compressor")
+        TOTAL_RAM=$(sysctl -n hw.memsize)
+        MEMORY_PERCENT=$(vm_stat | awk -v total_ram="$TOTAL_RAM" '
+          /page size of/ { page_size = $8 }
+          /Anonymous pages/ { anon = $3 + 0 }
+          /Pages wired/ { wired = $4 + 0 }
+          /Pages occupied by compressor/ { compressor = $5 + 0 }
+          END {
+            used = (anon + wired + compressor) * page_size
+            printf "%.0f", used / total_ram * 100
+          }
+        ')
 
         ${pkgs.sketchybar}/bin/sketchybar --set $NAME label="$MEMORY_PERCENT%"
       '';