diff --git a/teamsnap/dashboard/templatetags/availability_percentage.py b/teamsnap/dashboard/templatetags/availability_percentage.py
new file mode 100644
index 0000000..dc62e8b
--- /dev/null
+++ b/teamsnap/dashboard/templatetags/availability_percentage.py
@@ -0,0 +1,14 @@
+from django import template
+
+register = template.Library()
+
+
+@register.simple_tag
+def availability_percentage(availability_summary, status: str):
+    total = (
+        availability_summary.data["player_going_count"]
+        + availability_summary.data["player_maybe_count"]
+        + availability_summary.data["player_not_going_count"]
+        + availability_summary.data["player_unknown_count"]
+    )
+    return availability_summary.data[status + "_count"] / total * 100