diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7824f36..8e81e0b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@
 * game overview:
   * sort purchases also by date purchased (on top of date released)
   * improve header format 
+  * ignore manual sessions when calculating session average
 * stats: improve purchase name consistency
 * session list: use display name instead of sort name
 
diff --git a/games/models.py b/games/models.py
index 4288f58..da039cd 100644
--- a/games/models.py
+++ b/games/models.py
@@ -152,6 +152,19 @@ class SessionQuerySet(models.QuerySet):
         )
         return result["duration"]
 
+    def calculated_duration_formatted(self):
+        return format_duration(self.calculated_duration_unformatted())
+
+    def calculated_duration_unformatted(self):
+        result = self.aggregate(duration=Sum(F("duration_calculated")))
+        return result["duration"]
+
+    def without_manual(self):
+        return self.exclude(duration_calculated__iexact=0)
+
+    def only_manual(self):
+        return self.filter(duration_calculated__iexact=0)
+
 
 class Session(models.Model):
     class Meta:
diff --git a/games/templates/view_game.html b/games/templates/view_game.html
index 35061af..422770f 100644
--- a/games/templates/view_game.html
+++ b/games/templates/view_game.html
@@ -14,7 +14,7 @@
         <h2 class="text-lg my-2 ml-2 dark:text-slate-500">First Released: <span class="text-white">{{ game.year_released }}</span></h2>
         <h2 class="text-lg my-2 ml-2">
             <span class="dark:text-slate-500">Playtime: </span>
-            {{ hours_sum }} <span class="dark:text-slate-500">hours over</span> {{ session_count }} <span class="dark:text-slate-500">sessions (</span>{{ session_average }}<span class="dark:text-slate-500">/session)</span>
+            {{ hours_sum }} <span class="dark:text-slate-500">hours over</span> {{ session_count }} <span class="dark:text-slate-500">sessions (</span>{{ session_average_without_manual }}<span class="dark:text-slate-500">/session)</span>
         </h2>
         <h2 class="text-lg my-2 ml-2">
             <span class="dark:text-slate-500">Played in: </span>
diff --git a/games/views.py b/games/views.py
index 8a3250c..d354efe 100644
--- a/games/views.py
+++ b/games/views.py
@@ -175,6 +175,9 @@ def view_game(request, game_id=None):
         purchase__edition__game=game
     )
     session_count = sessions.count()
+    session_count_without_manual = (
+        Session.objects.without_manual().filter(purchase__edition__game=game).count()
+    )
 
     playrange_start = sessions.earliest().timestamp_start.strftime("%b %Y")
     latest_session = sessions.latest()
@@ -186,14 +189,21 @@ def view_game(request, game_id=None):
         else f"{playrange_start} — {playrange_end}"
     )
     total_hours = float(format_duration(sessions.total_duration_unformatted(), "%2.1H"))
-
+    total_hours_without_manual = float(
+        format_duration(sessions.calculated_duration_unformatted(), "%2.1H")
+    )
     context = {
         "edition_count": editions.count(),
         "editions": editions,
         "game": game,
         "playrange": playrange,
         "purchase_count": Purchase.objects.filter(edition__game=game).count(),
-        "session_average": round(total_hours / int(session_count), 1),
+        "session_average_without_manual": round(
+            safe_division(
+                total_hours_without_manual, int(session_count_without_manual)
+            ),
+            1,
+        ),
         "session_count": session_count,
         "sessions_with_notes_count": sessions.exclude(note="").count(),
         "sessions": sessions.order_by("-timestamp_start"),