diff --git a/app/models/poll/stats.rb b/app/models/poll/stats.rb
index d7c9826c5..d7e0031da 100644
--- a/app/models/poll/stats.rb
+++ b/app/models/poll/stats.rb
@@ -89,6 +89,10 @@ class Poll::Stats
     end
   end
 
+  def total_no_demographic_data
+    super + total_unregistered_booth
+  end
+
   private
 
     def participant_ids
@@ -103,6 +107,14 @@ class Poll::Stats
       @recounts ||= poll.recounts
     end
 
+    def total_registered_booth
+      voters.where(origin: "booth").count
+    end
+
+    def total_unregistered_booth
+      [total_participants_booth - total_registered_booth, 0].max
+    end
+
     stats_cache(*stats_methods)
 
     def stats_cache(key, &block)
diff --git a/spec/models/poll/stats_spec.rb b/spec/models/poll/stats_spec.rb
index 0f0957dd5..8f8b3583d 100644
--- a/spec/models/poll/stats_spec.rb
+++ b/spec/models/poll/stats_spec.rb
@@ -186,6 +186,34 @@ describe Poll::Stats do
     end
   end
 
+  describe "#total_no_demographic_data" do
+    before do
+      create(:poll_voter, :from_web, poll: poll, user: create(:user, :level_two, gender: nil))
+    end
+
+    context "more registered participants than participants in recounts" do
+      before do
+        create(:poll_recount, :from_booth, poll: poll, total_amount: 1)
+        2.times { create(:poll_voter, :from_booth, poll: poll) }
+      end
+
+      it "returns registered users with no demographic data" do
+        expect(stats.total_no_demographic_data).to eq 1
+      end
+    end
+
+    context "more participants in recounts than registered participants" do
+      before do
+        create(:poll_recount, :from_booth, poll: poll, total_amount: 3)
+        2.times { create(:poll_voter, :from_booth, poll: poll) }
+      end
+
+      it "returns registered users with no demographic data plus users not registered" do
+        expect(stats.total_no_demographic_data).to eq 2
+      end
+    end
+  end
+
   describe "#channels" do
     context "no participants" do
       it "returns no channels" do