Index: Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Data/DuneLocationCalculation.cs
===================================================================
diff -u -rf515fbd73e83548678552ed9e637957e1db0a3d0 -rbae137524febd2b8418ea3ceb47a6330d3c53c1e
--- Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Data/DuneLocationCalculation.cs	(.../DuneLocationCalculation.cs)	(revision f515fbd73e83548678552ed9e637957e1db0a3d0)
+++ Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Data/DuneLocationCalculation.cs	(.../DuneLocationCalculation.cs)	(revision bae137524febd2b8418ea3ceb47a6330d3c53c1e)
@@ -21,13 +21,14 @@
 
 using System;
 using Core.Common.Base;
+using Ringtoets.Common.Data.Calculation;
 
 namespace Ringtoets.DuneErosion.Data
 {
     /// <summary>
     /// Adapter class for a dune location calculation.
     /// </summary>
-    public class DuneLocationCalculation : Observable
+    public class DuneLocationCalculation : Observable, ICalculatable
     {
         /// <summary>
         /// Creates a new instance of <see cref="DuneLocationCalculation"/>.
@@ -54,5 +55,13 @@
         /// Gets the dune location the calculation belongs to.
         /// </summary>
         public DuneLocation DuneLocation { get; }
+
+        public bool ShouldCalculate
+        {
+            get
+            {
+                return Output == null;
+            }
+        }
     }
 }
\ No newline at end of file
Index: Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneLocationCalculationTest.cs
===================================================================
diff -u -re5e17b215166c0d4451d922e477cc4d0a4c15205 -rbae137524febd2b8418ea3ceb47a6330d3c53c1e
--- Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneLocationCalculationTest.cs	(.../DuneLocationCalculationTest.cs)	(revision e5e17b215166c0d4451d922e477cc4d0a4c15205)
+++ Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneLocationCalculationTest.cs	(.../DuneLocationCalculationTest.cs)	(revision bae137524febd2b8418ea3ceb47a6330d3c53c1e)
@@ -22,6 +22,7 @@
 using System;
 using Core.Common.Base;
 using NUnit.Framework;
+using Ringtoets.Common.Data.Calculation;
 using Ringtoets.DuneErosion.Data.TestUtil;
 
 namespace Ringtoets.DuneErosion.Data.Test
@@ -50,9 +51,42 @@
             var calculation = new DuneLocationCalculation(duneLocation);
 
             // Assert
+            Assert.IsInstanceOf<ICalculatable>(calculation);
             Assert.IsInstanceOf<Observable>(calculation);
             Assert.AreSame(duneLocation, calculation.DuneLocation);
             Assert.IsNull(calculation.Output);
         }
+
+        [Test]
+        public void ShouldCalculate_OutputNull_ReturnsTrue()
+        {
+            // Setup
+            var calculation = new DuneLocationCalculation(new TestDuneLocation())
+            {
+                Output = null
+            };
+
+            // Call
+            bool shouldCalculate = calculation.ShouldCalculate;
+
+            // Assert
+            Assert.IsTrue(shouldCalculate);
+        }
+
+        [Test]
+        public void ShouldCalculate_OutputSet_ReturnsFalse()
+        {
+            // Setup
+            var calculation = new DuneLocationCalculation(new TestDuneLocation())
+            {
+                Output = new TestDuneLocationCalculationOutput()
+            };
+
+            // Call
+            bool shouldCalculate = calculation.ShouldCalculate;
+
+            // Assert
+            Assert.IsFalse(shouldCalculate);
+        }
     }
 }
\ No newline at end of file