diff --git a/boards/models/tag.py b/boards/models/tag.py
--- a/boards/models/tag.py
+++ b/boards/models/tag.py
@@ -1,4 +1,4 @@
-from boards.models import Thread
+from boards.models import Thread, Post
 from django.db import models
 from django.db.models import Count
 
@@ -47,17 +47,14 @@ class Tag(models.Model):
         return self.threads.count()
 
     def get_popularity(self):
-        popularity = 0.0
+        all_post_count = Post.objects.all().count()
+
+        tag_reply_count = 0.0
 
         for thread in self.threads.all():
-            reply_count = thread.get_reply_count()
+            tag_reply_count += thread.get_reply_count()
 
-            thread_popularity = 0.0
-            thread_popularity += REPLY_POPULARITY * reply_count
-            thread_popularity += OPENING_POST_POPULARITY
-            if thread.archived:
-                thread_popularity *= ARCHIVE_POPULARITY_MODIFIER
-            popularity += thread_popularity
+        popularity = tag_reply_count / all_post_count
 
         return popularity