diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index d76743250..47e6bc89f 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.32.12",
+    "version": "2.32.13",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",
diff --git a/packages/hydrooj/src/entry/common.ts b/packages/hydrooj/src/entry/common.ts
index 323e8baf4..d8f22a642 100644
--- a/packages/hydrooj/src/entry/common.ts
+++ b/packages/hydrooj/src/entry/common.ts
@@ -31,6 +31,7 @@ export const builtinHandler = [
 
 export const builtinScript = [
     'rating', 'problemStat', 'blacklist', 'deleteUser', 'updateFilelist',
+    'storageUsage',
 ];
 
 function getFiles(folder: string, base = ''): string[] {
diff --git a/packages/hydrooj/src/script/storageUsage.ts b/packages/hydrooj/src/script/storageUsage.ts
new file mode 100644
index 000000000..a4b165214
--- /dev/null
+++ b/packages/hydrooj/src/script/storageUsage.ts
@@ -0,0 +1,41 @@
+/* eslint-disable no-await-in-loop */
+import { STATUS } from '../model/builtin';
+import storage from '../model/storage';
+
+export const description = 'Calculate storage usage';
+
+export async function run(_: {}, report: Function) {
+    const cursor = storage.coll.find({ path: { $regex: /^problem\//i } }).sort({ path: 1 });
+    const count = await cursor.count();
+    report({ message: `Total ${count} files` });
+    let current: string;
+    let memory = 0;
+    let start = new Date().getTime();
+    // eslint-disable-next-line no-constant-condition
+    while (true) {
+        const doc = await cursor.next();
+        const id = doc?.path.split('problem/')[1].split('/')[0]!;
+        if (!current) current = id;
+        if (!doc || current !== id) {
+            const end = new Date().getTime();
+            report({
+                case: {
+                    message: current,
+                    memory: Math.floor(memory / 102.4) / 10,
+                    time: end - start,
+                    status: STATUS.STATUS_ACCEPTED,
+                    score: 0,
+                },
+            });
+            start = end;
+            memory = 0;
+            current = id;
+            if (!doc) break;
+        }
+        memory += doc.size || 0;
+    }
+}
+
+export const validate = {};
+
+global.Hydro.script.storageUsage = { run, description, validate };