diff --git a/GraadDagen.java b/GraadDagen.java
new file mode 100644
index 0000000..04f8ae4
--- /dev/null
+++ b/GraadDagen.java
@@ -0,0 +1,49 @@
+
+    
+import java.util.ArrayList;
+
+public class GraadDagen extends Grootheid{
+    private ArrayList<Double> list;
+    private double graadDagen;
+    
+    //constructor
+    public GraadDagen(Measurement measurement1, ArrayList<Measurement> measurement2){
+        list = new ArrayList<Double>();
+        graadDagen = 0;
+        updateRecent(measurement1);
+        updatePeriod(measurement2);
+    }
+
+    
+    public void updateRecent(Measurement measurement1){
+        setCurrent(measurement1.getOutsideTemp());
+    }
+    public void updatePeriod(ArrayList<Measurement> measurement2){
+        createList(measurement2);
+                
+        graadDagen = StatisticsCalculator.graadDagen(list);
+    }
+    
+    public void display(){
+        GUIboard.writePageToMatrix("Aantal Graaddagen", graadDagen + "", "");
+    }
+    
+    public void displayGraph()
+    {
+        display();
+    }
+    
+    private void createList(ArrayList<Measurement> measurement2)
+    {
+        if(!list.isEmpty())
+        {
+            list.clear();
+        }
+        
+        for(Measurement ms : measurement2)
+        {
+            list.add(ms.getOutsideTemp());
+        }
+    }
+}
+