diff --git a/contents/code/halflayout.js b/contents/code/halflayout.js
index 0a906d2..25f62d9 100644
--- a/contents/code/halflayout.js
+++ b/contents/code/halflayout.js
@@ -30,7 +30,8 @@ function HalfLayout(screenRectangle) {
     } catch(err) {
         print(err, "in HalfLayout");
     }
-    this.firstWidth = this.screenRectangle.width / 2;
+    this.masterRatio = 100 / KWin.readConfig("halfLayoutMasterRatio", 50);
+    this.firstWidth = this.screenRectangle.width / this.masterRatio;
     this.master = 0;
     this.masterCount = 1;
 };
@@ -57,7 +58,7 @@ HalfLayout.prototype.addTile = function() {
                 var newWidth = this.screenRectangle.width / (this.tiles.length + 1);
                 var newSWidth = newWidth;
             } else {
-                this.firstWidth = this.screenRectangle.width / 2;
+                this.firstWidth = this.screenRectangle.width / this.masterRatio;
                 var newWidth = this.firstWidth / (this.tiles.length);
                 var newSWidth = this.screenRectangle.width - this.firstWidth;
             }
@@ -253,7 +254,7 @@ HalfLayout.prototype.decrementMaster = function() {
         var newSWidth = this.screenRectangle.width - (newMWidth * newC);
         var newSHeight = this.screenRectangle.height / (this.tiles.length - newC);
     } else if (this.tiles.length == oldC) {
-        var newMWidth = (this.screenRectangle.width / 2) / newC ;
+        var newMWidth = (this.screenRectangle.width / this.masterRatio) / newC ;
         var newSWidth = this.screenRectangle.width - (newMWidth * newC);
         var newSHeight = this.screenRectangle.height / (this.tiles.length - newC);
     } else {
@@ -277,6 +278,6 @@ HalfLayout.prototype.decrementMaster = function() {
     if(newC != 0) {
         this.firstWidth = this.getMasterWidth();
     } else {
-        this.firstWidth = this.screenRectangle.width / 2;
+        this.firstWidth = this.screenRectangle.width / this.masterRatio;
     }
 };
diff --git a/contents/config/main.xml b/contents/config/main.xml
index 1cc3b5e..475fd21 100644
--- a/contents/config/main.xml
+++ b/contents/config/main.xml
@@ -69,5 +69,9 @@
 		  <label>Remove empty desktops</label>
 		  <default>false</default>
 		</entry>
+		<entry name="halfLayoutMasterRatio" type="int">
+		  <label>Default Half Layout master ratio</label>
+		  <default>50</default>
+		</entry>
     </group>
 </kcfg>
diff --git a/contents/ui/config.ui b/contents/ui/config.ui
index 5b551fe..d1ae84c 100644
--- a/contents/ui/config.ui
+++ b/contents/ui/config.ui
@@ -210,6 +210,62 @@
        </item>
       </layout>
      </widget>
+     <widget class="QWidget" name="halfLayoutTab">
+      <attribute name="title">
+       <string>Half Layout</string>
+      </attribute>
+      <layout class="QGridLayout" name="gridLayout_3">
+       <item row="0" column="2">
+        <spacer name="horizontalSpacer">
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>40</width>
+           <height>20</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item row="1" column="2">
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item row="0" column="1">
+        <widget class="QSpinBox" name="kcfg_halfLayoutMasterRatio">
+         <property name="suffix">
+          <string notr="true">%</string>
+         </property>
+         <property name="minimum">
+          <number>10</number>
+         </property>
+         <property name="maximum">
+          <number>90</number>
+         </property>
+         <property name="value">
+          <number>50</number>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="0">
+        <widget class="QLabel" name="label_11">
+         <property name="text">
+          <string>Default master width</string>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
     </widget>
    </item>
   </layout>