diff --git a/include/mcl/memory/literals.hpp b/include/mcl/memory/literals.hpp
new file mode 100644
index 0000000..3345f7c
--- /dev/null
+++ b/include/mcl/memory/literals.hpp
@@ -0,0 +1,36 @@
+// This file is part of the mcl project.
+// Copyright (c) 2022 merryhime
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include "mcl/stdint.hpp"
+
+namespace mcl::memory::literals {
+
+constexpr u64 operator""_KiB(unsigned long long int x)
+{
+    return 1024ULL * x;
+}
+
+constexpr u64 operator""_MiB(unsigned long long int x)
+{
+    return 1024_KiB * x;
+}
+
+constexpr u64 operator""_GiB(unsigned long long int x)
+{
+    return 1024_MiB * x;
+}
+
+constexpr u64 operator""_TiB(unsigned long long int x)
+{
+    return 1024_GiB * x;
+}
+
+constexpr u64 operator""_PiB(unsigned long long int x)
+{
+    return 1024_TiB * x;
+}
+
+}  // namespace mcl::memory::literals
\ No newline at end of file