diff --git a/lib/models/expense.dart b/lib/models/expense.dart
index 374ec58..f983812 100644
--- a/lib/models/expense.dart
+++ b/lib/models/expense.dart
@@ -15,4 +15,8 @@ class Expense {
   String toString() {
     return "$name, $cost, ${frequency.title}, $description";
   }
+
+  double calcComparableCost() {
+    return cost * frequency.timesPerYear;
+  }
 }