diff --git a/src/core/common/timer.hpp b/src/core/common/timer.hpp
index 18c3db12e..a081ba287 100644
--- a/src/core/common/timer.hpp
+++ b/src/core/common/timer.hpp
@@ -233,22 +233,6 @@ public:
      */
     static uint32_t MsecToSec(uint32_t aMilliseconds) { return aMilliseconds / 1000u; }
 
-    /**
-     * This static method returns the number of milliseconds given hours.
-     *
-     * @returns The number of milliseconds.
-     *
-     */
-    static uint32_t HoursToMsec(uint32_t aHours) { return SecToMsec(aHours * 3600u); }
-
-    /**
-     * This static method returns the number of hours given milliseconds.
-     *
-     * @returns The number of hours.
-     *
-     */
-    static uint32_t MsecToHours(uint32_t aMilliseconds) { return MsecToSec(aMilliseconds / 3600u); }
-
 private:
     /**
      * This method indicates if the fire time of this timer is strictly before the fire time of a second given timer.