diff --git a/src/app/[orgId]/settings/sites/SitesTable.tsx b/src/app/[orgId]/settings/sites/SitesTable.tsx
index c032800f..e2fba418 100644
--- a/src/app/[orgId]/settings/sites/SitesTable.tsx
+++ b/src/app/[orgId]/settings/sites/SitesTable.tsx
@@ -27,6 +27,7 @@ import { formatAxiosError } from "@app/lib/api";
 import { createApiClient } from "@app/lib/api";
 import { useEnvContext } from "@app/hooks/useEnvContext";
 import CreateSiteFormModal from "./CreateSiteModal";
+import { parseDataSize } from '@app/lib/dataSize';
 
 export type SiteRow = {
     id: number;
@@ -197,7 +198,12 @@ export default function SitesTable({ sites, orgId }: SitesTableProps) {
                         <ArrowUpDown className="ml-2 h-4 w-4" />
                     </Button>
                 );
-            }
+            },
+            sortingFn: (rowA, rowB) => {
+                const a = parseDataSize(rowA.original.mbIn);
+                const b = parseDataSize(rowB.original.mbIn);
+                return a > b ? 1 : a < b ? -1 : 0;
+            },
         },
         {
             accessorKey: "mbOut",
@@ -213,7 +219,12 @@ export default function SitesTable({ sites, orgId }: SitesTableProps) {
                         <ArrowUpDown className="ml-2 h-4 w-4" />
                     </Button>
                 );
-            }
+            },
+            sortingFn: (rowA, rowB) => {
+                const a = parseDataSize(rowA.original.mbOut);
+                const b = parseDataSize(rowB.original.mbOut);
+                return a > b ? 1 : a < b ? -1 : 0;
+            },
         },
         {
             accessorKey: "type",
diff --git a/src/lib/dataSize.ts b/src/lib/dataSize.ts
new file mode 100644
index 00000000..5ac4e4ae
--- /dev/null
+++ b/src/lib/dataSize.ts
@@ -0,0 +1,11 @@
+export function parseDataSize(sizeStr: string): number {
+  if (!sizeStr) return 0;
+  const match = sizeStr.trim().toUpperCase().match(/^([\d.]+)\s*([KMGT]?B)$/);
+  if (!match) return 0;
+  const [, numStr, unit] = match;
+  const num = parseFloat(numStr) || 0;
+  const multipliers: Record<string, number> = {
+    B: 1, KB: 1024, MB: 1024**2, GB: 1024**3, TB: 1024**4,
+  };
+  return num * (multipliers[unit] || 1);
+}
\ No newline at end of file