diff --git a/include/ratio b/include/ratio
index f623a062..8f708ce4 100644
--- a/include/ratio
+++ b/include/ratio
@@ -62,6 +62,19 @@ typedef ratio<      1000000000000000000, 1> exa;
 typedef ratio<   1000000000000000000000, 1> zetta;  // not supported
 typedef ratio<1000000000000000000000000, 1> yotta;  // not supported
 
+  // 20.11.5, ratio comparison
+  template <class R1, class R2> constexpr bool ratio_equal_v
+    = ratio_equal<R1, R2>::value;                                       // C++17
+  template <class R1, class R2> constexpr bool ratio_not_equal_v
+    = ratio_not_equal<R1, R2>::value;                                   // C++17
+  template <class R1, class R2> constexpr bool ratio_less_v
+    = ratio_less<R1, R2>::value;                                        // C++17
+  template <class R1, class R2> constexpr bool ratio_less_equal_v
+    = ratio_less_equal<R1, R2>::value;                                  // C++17
+  template <class R1, class R2> constexpr bool ratio_greater_v
+    = ratio_greater<R1, R2>::value;                                     // C++17
+  template <class R1, class R2> constexpr bool ratio_greater_equal_v
+    = ratio_greater_equal<R1, R2>::value;                               // C++17
 }
 */
 
@@ -485,6 +498,26 @@ struct __ratio_gcd
                   __static_lcm<_R1::den, _R2::den>::value> type;
 };
 
+#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES)
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_equal_v
+    = ratio_equal<_R1, _R2>::value;
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_not_equal_v
+    = ratio_not_equal<_R1, _R2>::value;
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_less_v
+    = ratio_less<_R1, _R2>::value;
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_less_equal_v
+    = ratio_less_equal<_R1, _R2>::value;
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_greater_v
+    = ratio_greater<_R1, _R2>::value;
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_greater_equal_v
+    = ratio_greater_equal<_R1, _R2>::value;
+#endif
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif  // _LIBCPP_RATIO