diff --git a/CHANGELOG.md b/CHANGELOG.md
index f534bd35..0146b246 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,10 @@ Section Order:
 
 <!-- Your changes go here -->
 
+### Changed
+
+- Show ADM with always 1 decimal
+
 ## [5.1.0] - 2026-08-04
 
 > [!IMPORTANT]
diff --git a/sovtimer/tests/test_views.py b/sovtimer/tests/test_views.py
index 28bec5f3..5fee1666 100644
--- a/sovtimer/tests/test_views.py
+++ b/sovtimer/tests/test_views.py
@@ -238,7 +238,7 @@ def test_dashboard_data_handles_missing_vulnerability_levels(
 
         self.assertEqual(response.status_code, HTTPStatus.OK)
         self.assertEqual(len(response.json()), 1)
-        self.assertEqual(response.json()[0]["adm"], 1)
+        self.assertEqual(response.json()[0]["adm"], "1.0")
 
     @patch("sovtimer.views.Campaign.Type")
     @patch("sovtimer.views.timezone.now")
diff --git a/sovtimer/views.py b/sovtimer/views.py
index 13a55396..0f9a0be7 100644
--- a/sovtimer/views.py
+++ b/sovtimer/views.py
@@ -123,8 +123,10 @@ def dashboard_data(  # pylint: disable=too-many-statements too-many-locals
         region_name = region.name
         region_name_html = f'<a href="{region_url}" target="_blank" rel="noopener noreferer">{region_name}</a>'
 
-        # Activity defense multiplier (fast lookup)
-        structure_adm = occupancy_by_system.get(campaign.structure.solar_system_id, 1)
+        # Activity defense multiplier (fast lookup) formatted with one decimal
+        structure_adm = (
+            f"{occupancy_by_system.get(campaign.structure.solar_system_id, 1):.1f}"
+        )
 
         # Start time and remaining seconds (use timezone-aware now)
         start_time = campaign.start_time