diff --git a/src/ImageProcessor.UnitTests/Imaging/RotationUnitTests.cs b/src/ImageProcessor.UnitTests/Imaging/RotationUnitTests.cs
index 6e71079c6..0e33eb5dc 100644
--- a/src/ImageProcessor.UnitTests/Imaging/RotationUnitTests.cs
+++ b/src/ImageProcessor.UnitTests/Imaging/RotationUnitTests.cs
@@ -23,6 +23,9 @@
         [TestCase(100, 100, 45, 1.41f)]
         [TestCase(100, 100, 15, 1.22f)]
         [TestCase(100, 200, 45, 2.12f)]
+        [TestCase(200, 100, 45, 2.12f)]
+        [TestCase(600, 450, 20, 1.39f)]
+        [TestCase(600, 450, 45, 1.64f)]
         public void RotationZoomIsCalculated(int imageWidth, int imageHeight, float angle, float expected)
         {
             float result = Rotation.ZoomAfterRotation(imageWidth, imageHeight, angle);
diff --git a/src/ImageProcessor/Imaging/Rotation.cs b/src/ImageProcessor/Imaging/Rotation.cs
index b2ecd30cc..421216e00 100644
--- a/src/ImageProcessor/Imaging/Rotation.cs
+++ b/src/ImageProcessor/Imaging/Rotation.cs
@@ -56,7 +56,7 @@
             double widthRotated = (imageWidth * radiansCos) + (imageHeight * radiansSin);
             double heightRotated = (imageWidth * radiansSin) + (imageHeight * radiansCos);
 
-            return (float)(Math.Max(widthRotated, heightRotated) / 100);
+            return (float)Math.Max(widthRotated / imageWidth, heightRotated / imageHeight);
         }
     }
 }
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