diff --git a/homeassistant/components/history_stats/data.py b/homeassistant/components/history_stats/data.py
index 33f32e72292d..d9b331d82bb7 100644
--- a/homeassistant/components/history_stats/data.py
+++ b/homeassistant/components/history_stats/data.py
@@ -18,7 +18,7 @@ MIN_TIME_UTC = datetime.datetime.min.replace(tzinfo=dt_util.UTC)
 class HistoryStatsState:
     """The current stats of the history stats."""
 
-    hours_matched: float | None
+    seconds_matched: float | None
     match_count: int | None
     period: tuple[datetime.datetime, datetime.datetime]
 
@@ -125,12 +125,12 @@ class HistoryStats:
             await self._async_history_from_db(current_period_start, current_period_end)
             self._previous_run_before_start = False
 
-        hours_matched, match_count = self._async_compute_hours_and_changes(
+        seconds_matched, match_count = self._async_compute_seconds_and_changes(
             now_timestamp,
             current_period_start_timestamp,
             current_period_end_timestamp,
         )
-        self._state = HistoryStatsState(hours_matched, match_count, self._period)
+        self._state = HistoryStatsState(seconds_matched, match_count, self._period)
         return self._state
 
     async def _async_history_from_db(
@@ -162,10 +162,10 @@ class HistoryStats:
             no_attributes=True,
         ).get(self.entity_id, [])
 
-    def _async_compute_hours_and_changes(
+    def _async_compute_seconds_and_changes(
         self, now_timestamp: float, start_timestamp: float, end_timestamp: float
     ) -> tuple[float, int]:
-        """Compute the hours matched and changes from the history list and first state."""
+        """Compute the seconds matched and changes from the history list and first state."""
         # state_changes_during_period is called with include_start_time_state=True
         # which is the default and always provides the state at the start
         # of the period
@@ -195,6 +195,6 @@ class HistoryStats:
             measure_end = min(end_timestamp, now_timestamp)
             elapsed += measure_end - last_state_change_timestamp
 
-        # Save value in hours
-        hours_matched = elapsed / 3600
-        return hours_matched, match_count
+        # Save value in seconds
+        seconds_matched = elapsed
+        return seconds_matched, match_count
diff --git a/homeassistant/components/history_stats/helpers.py b/homeassistant/components/history_stats/helpers.py
index 23143984f485..0c914e1fd415 100644
--- a/homeassistant/components/history_stats/helpers.py
+++ b/homeassistant/components/history_stats/helpers.py
@@ -79,7 +79,7 @@ def pretty_ratio(
     if len(period) != 2 or period[0] == period[1]:
         return 0.0
 
-    ratio = 100 * 3600 * value / (period[1] - period[0]).total_seconds()
+    ratio = 100 * value / (period[1] - period[0]).total_seconds()
     return round(ratio, 1)
 
 
diff --git a/homeassistant/components/history_stats/sensor.py b/homeassistant/components/history_stats/sensor.py
index fc3aedfde24c..2b02be17e9aa 100644
--- a/homeassistant/components/history_stats/sensor.py
+++ b/homeassistant/components/history_stats/sensor.py
@@ -163,13 +163,13 @@ class HistoryStatsSensor(HistoryStatsSensorBase):
     def _process_update(self) -> None:
         """Process an update from the coordinator."""
         state = self.coordinator.data
-        if state is None or state.hours_matched is None:
+        if state is None or state.seconds_matched is None:
             self._attr_native_value = None
             return
 
         if self._type == CONF_TYPE_TIME:
-            self._attr_native_value = round(state.hours_matched, 2)
+            self._attr_native_value = round(state.seconds_matched / 3600, 2)
         elif self._type == CONF_TYPE_RATIO:
-            self._attr_native_value = pretty_ratio(state.hours_matched, state.period)
+            self._attr_native_value = pretty_ratio(state.seconds_matched, state.period)
         elif self._type == CONF_TYPE_COUNT:
             self._attr_native_value = state.match_count