diff --git a/lcl/interfaces/cocoa/cocoaprivate.pas b/lcl/interfaces/cocoa/cocoaprivate.pas
index 881acae889..6320a33f84 100644
--- a/lcl/interfaces/cocoa/cocoaprivate.pas
+++ b/lcl/interfaces/cocoa/cocoaprivate.pas
@@ -1144,7 +1144,7 @@ begin
   params.isFirstCall:= not hasMarkedText();
 
   rect:= imeHandler.IMEGetTextBound( params );
-  LCLToNSRect( rect, NSGlobalScreenHeight, Result );
+  LCLToNSRect( rect, NSGlobalScreenBottom, Result );
 end;
 
 procedure TCocoaFullControlEdit.unmarkText;
diff --git a/lcl/interfaces/cocoa/cocoawinapi.inc b/lcl/interfaces/cocoa/cocoawinapi.inc
index 04f70edd99..01a11e832a 100644
--- a/lcl/interfaces/cocoa/cocoawinapi.inc
+++ b/lcl/interfaces/cocoa/cocoawinapi.inc
@@ -1074,7 +1074,7 @@ begin
 
   contentView := TCocoaWindowContent(Handle);
   if (not contentView.isembedded) and Assigned(contentView.window) then
-    NSToLCLRect(contentView.window.frame, NSGlobalScreenHeight, ARect)
+    ARect := ScreenRectFromNSToLCL( contentView.window.frame )
   else
     ARect := contentView.lclFrame;
   Result := 1;
@@ -1138,19 +1138,13 @@ end;
 
 function TCocoaWidgetSet.GetCursorPos(var lpPoint: TPoint ): Boolean;
 begin
-  with NSEvent.mouseLocation do
-  begin
-    lpPoint.x := Round(x);
-    // cocoa returns cursor with inverted y coordinate
-    lpPoint.y := Round(NSGlobalScreenHeight-y);
-  end;
+  lpPoint:= ScreenPointFromNSToLCL( NSEvent.mouseLocation );
   //debugln('GetCursorPos='+DbgS(lpPoint));
   Result := True;
 end;
 
 function TCocoaWidgetSet.GetMonitorInfo(hMonitor: HMONITOR; lpmi: PMonitorInfo): Boolean;
 var
-  globalScreenHeight:  CGFloat;
   ScreenID: NSScreen;
 begin
   Result := (lpmi <> nil) and (lpmi^.cbSize >= SizeOf(TMonitorInfo));
@@ -1159,9 +1153,8 @@ begin
   Result := Assigned(ScreenID);
   if not Result then Exit;
 
-  globalScreenHeight := NSGlobalScreenHeight;
-  NSToLCLRect(ScreenID.frame, globalScreenHeight, lpmi^.rcMonitor);
-  NSToLCLRect(ScreenID.visibleFrame, globalScreenHeight, lpmi^.rcWork);
+  lpmi^.rcMonitor:= ScreenRectFromNSToLCL( ScreenID.frame );
+  lpmi^.rcWork:= ScreenRectFromNSToLCL( ScreenID.visibleFrame );
   // according to the documentation the primary (0,0 coord screen)
   // is always and index 0
   if HMonitorToIndex(hMonitor) = 0 then
@@ -1477,7 +1470,7 @@ begin
     Exit;
 
   p.x:=Point.X;
-  p.y:=NSGlobalScreenHeight-Point.Y;
+  p.y:=NSGlobalScreenBottom-Point.Y;
   window := GetCocoaWindowAtPos(p);
   if Assigned(window) then
     Result:= HWND(window.contentView);
@@ -1876,7 +1869,7 @@ var
   i: Integer;
 begin
   Result:= 0;
-  point:= LCLToNSPoint( ptScreenCoords, NSGlobalScreenHeight );
+  point:= ScreenPointFromLCLToNS( ptScreenCoords );
   if point.y>=1 then         // NSPointInRect is (upper,left) inside
     point.y:= point.y-1;     // (lower,right) outside
 
diff --git a/lcl/interfaces/cocoa/cocoawindows.pas b/lcl/interfaces/cocoa/cocoawindows.pas
index 8ad080b81d..dd1c18fbc1 100644
--- a/lcl/interfaces/cocoa/cocoawindows.pas
+++ b/lcl/interfaces/cocoa/cocoawindows.pas
@@ -446,7 +446,7 @@ begin
   if not isembedded then
   begin
     //Window bounds should return "client rect" in screen coordinates
-    NSToLCLRect(window.frame, NSGlobalScreenHeight, wfrm);
+    wfrm := ScreenRectFromNSToLCL(window.frame);
     Types.OffsetRect(Result, -Result.Left+wfrm.Left, -Result.Top+wfrm.Top);
   end;
 end;
@@ -1250,7 +1250,7 @@ var
 begin
   f := frame;
   inc(X, Round(f.origin.x));
-  inc(Y, Round(NSGlobalScreenHeight - NSMaxY(f)));
+  inc(Y, Round(NSGlobalScreenBottom - NSMaxY(f)));
 end;
 
 procedure LCLWindowExtension.lclScreenToLocal(var X, Y: Integer);
@@ -1259,15 +1259,15 @@ var
 begin
   f := frame;
   dec(X, Round(f.origin.x));
-  dec(Y, Round(NSGlobalScreenHeight - NSMaxY(f)));
+  dec(Y, Round(NSGlobalScreenBottom - NSMaxY(f)));
 end;
 
 function LCLWindowExtension.lclFrame: TRect;
 begin
   if Assigned(contentView) then
-    Result:=contentView.lclFrame
+    Result:= contentView.lclFrame
   else
-    NSToLCLRect(frame, NSGlobalScreenHeight, Result);
+    Result:= ScreenRectFromNSToLCL( frame );
 end;
 
 function LCLWindowExtension.lclGetTopBarHeight:integer;
@@ -1288,12 +1288,12 @@ var
   ns : NSRect;
   h  : integer;
 begin
-  LCLToNSRect(r, NSGlobalScreenHeight, ns);
+  ns:= ScreenRectFromLCLToNS( r );
 
   // add topbar height
-  h:=lclGetTopBarHeight;
-  ns.size.height:=ns.size.height+h;
-  ns.origin.y:=ns.origin.y-h;
+  h:= lclGetTopBarHeight;
+  ns.size.height:= ns.size.height + h;
+  ns.origin.y:= ns.origin.y - h;
   {$ifdef BOOLFIX}
   setFrame_display_(ns, Ord(isVisible));
   {$else}
diff --git a/lcl/interfaces/cocoa/cocoawscommon.pas b/lcl/interfaces/cocoa/cocoawscommon.pas
index e8bf47905e..978e15265c 100644
--- a/lcl/interfaces/cocoa/cocoawscommon.pas
+++ b/lcl/interfaces/cocoa/cocoawscommon.pas
@@ -536,8 +536,8 @@ begin
   if lWindow <> nil then
   begin
     f := lWindow.frame;
-    Point.x := Point.x+f.origin.x;
-    Point.y := lWindow.screen.frame.size.height- f.origin.y - Point.y;
+    Point.x := Point.x + f.origin.x;
+    Point.y := NSGlobalScreenBottom - ( Point.y + f.origin.y );
   end;
 end;
 
diff --git a/lcl/interfaces/cocoa/cocoawsmenus.pas b/lcl/interfaces/cocoa/cocoawsmenus.pas
index f4a4a489fd..830716b2e2 100644
--- a/lcl/interfaces/cocoa/cocoawsmenus.pas
+++ b/lcl/interfaces/cocoa/cocoawsmenus.pas
@@ -963,7 +963,7 @@ begin
   point:= TPoint.Create( x, y );
   screen:= getScreenFromHMonitor( CocoaWidgetSet.MonitorFromPoint(point, MONITOR_DEFAULTTONULL) );
 
-  mouseY:= NSGlobalScreenHeight - y;
+  mouseY:= NSGlobalScreenBottom - y;
   if Assigned(screen) then begin
     menuY:= screen.visibleFrame.origin.y + menu.size.height + 1;
     menuY:= max( mouseY, MenuY );