diff --git a/flashcards/models.py b/flashcards/models.py
index 1b79d9c..0fceff2 100644
--- a/flashcards/models.py
+++ b/flashcards/models.py
@@ -10,6 +10,7 @@ from django.core.mail import send_mail
 from django.db import IntegrityError
 from django.db.models import *
 from django.utils.timezone import now, make_aware
+from flashy.settings import QUARTER_START
 from simple_email_confirmation import SimpleEmailConfirmationUserMixin
 from fields import MaskField
 from cached_property import cached_property
@@ -188,6 +189,10 @@ class Flashcard(Model):
         # By default, order by most recently pushed
         ordering = ['-pushed']
 
+    @property
+    def material_week_num(self):
+        return (self.material_date-QUARTER_START).days/7+1
+
     def is_hidden_from(self, user):
         """
         A card can be hidden globally, but if a user has the card in their deck,
diff --git a/flashcards/serializers.py b/flashcards/serializers.py
index cdc8c4f..a476ce7 100644
--- a/flashcards/serializers.py
+++ b/flashcards/serializers.py
@@ -125,6 +125,7 @@ class FlashcardSerializer(ModelSerializer):
     is_hidden = SerializerMethodField()
     is_in_deck = SerializerMethodField()
     # hide_reason = CharField(read_only=True)
+    material_week_num = IntegerField(read_only=True)
     material_date = DateTimeField(default=now)
     mask = MaskFieldSerializer(allow_null=True)
     score = FloatField(read_only=True)