diff --git a/src/box/lua/slab.cc b/src/box/lua/slab.cc
index 0a88bd0c9ce5a5604878e3418a67213a6f123f93..f7e298157ec1fe1b12f7dc780223e0ce8c05a1d9 100644
--- a/src/box/lua/slab.cc
+++ b/src/box/lua/slab.cc
@@ -97,6 +97,24 @@ lbox_slab_info(struct lua_State *L)
 	lua_pushstring(L, "arena_size");
 	luaL_pushnumber64(L, totals.total);
 	lua_settable(L, -3);
+
+	char value[32];
+	double items_used_ratio = 100
+		* ((double)totals.used)
+		/ ((double)talloc.cache->arena->prealloc + 0.0001);
+	snprintf(value, sizeof(value), "%0.1lf%%", items_used_ratio);
+	lua_pushstring(L, "items_used_ratio");
+	lua_pushstring(L, value);
+	lua_settable(L, -3);
+
+	double arena_used_ratio = 100
+		* ((double)talloc.cache->arena->used)
+		/ ((double)talloc.cache->arena->prealloc + 0.0001);
+	snprintf(value, sizeof(value), "%0.1lf%%", arena_used_ratio);
+	lua_pushstring(L, "arena_used_ratio");
+	lua_pushstring(L, value);
+	lua_settable(L, -3);
+
 	return 1;
 }
 
diff --git a/test/box/misc.result b/test/box/misc.result
index 59d1a1f60e010132f48ee7731552a3e2b23ba1fc..bea2b767b878b0df1cc20b092ebffa6235ae7ec6 100644
--- a/test/box/misc.result
+++ b/test/box/misc.result
@@ -148,9 +148,11 @@ end;
 ...
 t;
 ---
-- - slabs
-  - arena_size
+- - arena_used_ratio
+  - items_used_ratio
   - arena_used
+  - arena_size
+  - slabs
 ...
 ----------------
 -- # box.error