diff --git a/dist/image-editor.js b/dist/image-editor.js
index db3146b..574776e 100644
--- a/dist/image-editor.js
+++ b/dist/image-editor.js
@@ -1210,7 +1210,9 @@ function ImageEditor(canvasId, args) {
         dimensions: {
             width: 800,
             height: 600
-        }
+        },
+        // Default unit
+        unit: 'cm'
     }, args);
 
 
@@ -1269,14 +1271,14 @@ function ImageEditor(canvasId, args) {
      * Crops image to desired dimensions
      * @param  {int} width  [description]
      * @param  {int} height [description]
-     * @param  {string} units cm|inch
+     * @param  {string} unit cm|inch
      * @return {ImageEditor}
      */
-    this.crop = function (width, height, units) {
-
+    this.crop = function (width, height, unit) {
+        unit = typeof unit !== 'undefined' ? unit : _settings.unit;
         _canvas.getImageData().removeCropData();
 
-        _canvas.getViewport().set(width, height, units);
+        _canvas.getViewport().set(width, height, unit);
 
         var shouldBeCropped = util.isAspectChanged(_canvas.getImage().width, _canvas.getImage().height, width, height);
 
diff --git a/examples/photo-wallpaper/index.html b/examples/photo-wallpaper/index.html
index 9894685..bdd1a75 100644
--- a/examples/photo-wallpaper/index.html
+++ b/examples/photo-wallpaper/index.html
@@ -17,7 +17,7 @@
             });
 
             function cropImage() {
-                editor.crop(width.value, height.value, 'cm');
+                editor.crop(width.value, height.value);
             }
 
             function resizeEditor() {
diff --git a/src/ImageEditor.js b/src/ImageEditor.js
index dfcfb4e..7d59955 100644
--- a/src/ImageEditor.js
+++ b/src/ImageEditor.js
@@ -24,7 +24,9 @@ function ImageEditor(canvasId, args) {
         dimensions: {
             width: 800,
             height: 600
-        }
+        },
+        // Default unit
+        unit: 'cm'
     }, args);
 
 
@@ -83,14 +85,14 @@ function ImageEditor(canvasId, args) {
      * Crops image to desired dimensions
      * @param  {int} width  [description]
      * @param  {int} height [description]
-     * @param  {string} units cm|inch
+     * @param  {string} unit cm|inch
      * @return {ImageEditor}
      */
-    this.crop = function (width, height, units) {
-
+    this.crop = function (width, height, unit) {
+        unit = typeof unit !== 'undefined' ? unit : _settings.unit;
         _canvas.getImageData().removeCropData();
 
-        _canvas.getViewport().set(width, height, units);
+        _canvas.getViewport().set(width, height, unit);
 
         var shouldBeCropped = util.isAspectChanged(_canvas.getImage().width, _canvas.getImage().height, width, height);