diff --git a/src/Gui/CommandStd.cpp b/src/Gui/CommandStd.cpp
index d696adaeb..f649f22d9 100644
--- a/src/Gui/CommandStd.cpp
+++ b/src/Gui/CommandStd.cpp
@@ -649,12 +649,12 @@ void StdCmdMeasurementSimple::activated(int iMsg)
     commitCommand();
 }
 //===========================================================================
-// Std_UnitsCalculater
+// Std_UnitsCalculator
 //===========================================================================
 DEF_STD_CMD(StdCmdUnitsCalculator);
 
 StdCmdUnitsCalculator::StdCmdUnitsCalculator()
-  : Command("Std_UnitsCalculater")
+  : Command("Std_UnitsCalculator")
 {
     sGroup        = QT_TR_NOOP("Tools");
     sMenuText     = QT_TR_NOOP("&Units calculator...");
diff --git a/src/Gui/DlgUnitsCalculator.ui b/src/Gui/DlgUnitsCalculator.ui
index 480c4b102..054336674 100644
--- a/src/Gui/DlgUnitsCalculator.ui
+++ b/src/Gui/DlgUnitsCalculator.ui
@@ -11,7 +11,7 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Units calculater</string>
+   <string>Units calculator</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
diff --git a/src/Gui/Workbench.cpp b/src/Gui/Workbench.cpp
index 8a40656cb..1e9ba4296 100644
--- a/src/Gui/Workbench.cpp
+++ b/src/Gui/Workbench.cpp
@@ -492,7 +492,7 @@ MenuItem* StdWorkbench::setupMenuBar() const
     *tool << "Std_DlgParameter" << "Separator"
           << "Std_ViewScreenShot" << "Std_SceneInspector" 
           << "Std_ExportGraphviz" << "Std_ProjectUtil"
-          << "Std_DemoMode" << "Std_UnitsCalculater" << "Separator" << "Std_DlgCustomize";
+          << "Std_DemoMode" << "Std_UnitsCalculator" << "Separator" << "Std_DlgCustomize";
 
     // Macro
     MenuItem* macro = new MenuItem( menuBar );