diff --git a/src/gui/editorwidgets/qgshtmlwidgetwrapper.cpp b/src/gui/editorwidgets/qgshtmlwidgetwrapper.cpp
index 3a6d7226251b..d679d84a39ef 100644
--- a/src/gui/editorwidgets/qgshtmlwidgetwrapper.cpp
+++ b/src/gui/editorwidgets/qgshtmlwidgetwrapper.cpp
@@ -19,7 +19,7 @@
 #include "qgsexpressioncontextutils.h"
 #include "qgsapplication.h"
 #include "qgswebframe.h"
-
+#include <QScreen>
 
 QgsHtmlWidgetWrapper::QgsHtmlWidgetWrapper( QgsVectorLayer *layer, QWidget *editor, QWidget *parent )
   : QgsWidgetWrapper( layer, editor, parent )
@@ -46,7 +46,14 @@ void QgsHtmlWidgetWrapper::initWidget( QWidget *editor )
 
   mWidget->setHtml( mHtmlCode );
 #ifdef WITH_QTWEBKIT
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 10, 0)
   const int horizontalDpi = qApp->desktop()->screen()->logicalDpiX();
+#else
+  QScreen *screen = QGuiApplication::screenAt( mWidget->mapToGlobal( QPoint( mWidget->width() / 2, 0 ) ) );
+  const int horizontalDpi = screen->logicalDotsPerInchX();
+#endif
+
   mWidget->setZoomFactor( horizontalDpi / 96.0 );
 
   QWebPage *page = mWidget->page();
diff --git a/src/gui/layout/qgslayoutitemslistview.cpp b/src/gui/layout/qgslayoutitemslistview.cpp
index 9eaea30cd1dd..7e3cca77b0ca 100644
--- a/src/gui/layout/qgslayoutitemslistview.cpp
+++ b/src/gui/layout/qgslayoutitemslistview.cpp
@@ -100,8 +100,13 @@ void QgsLayoutItemsListView::setCurrentLayout( QgsLayout *layout )
 
   header()->setSectionResizeMode( 0, QHeaderView::Fixed );
   header()->setSectionResizeMode( 1, QHeaderView::Fixed );
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
   setColumnWidth( 0, Qgis::UI_SCALE_FACTOR * fontMetrics().width( QStringLiteral( "xxxx" ) ) );
   setColumnWidth( 1, Qgis::UI_SCALE_FACTOR * fontMetrics().width( QStringLiteral( "xxxx" ) ) );
+#else
+  setColumnWidth( 0, Qgis::UI_SCALE_FACTOR * fontMetrics().horizontalAdvance( 'x' ) * 4 );
+  setColumnWidth( 1, Qgis::UI_SCALE_FACTOR * fontMetrics().horizontalAdvance( 'x' ) * 4 );
+#endif
   header()->setSectionsMovable( false );
 
   connect( selectionModel(), &QItemSelectionModel::currentChanged, mModel, &QgsLayoutItemsListViewModel::setSelected );
diff --git a/src/gui/qgscolorschemelist.cpp b/src/gui/qgscolorschemelist.cpp
index e6d7f75cba47..408ff0fecd57 100644
--- a/src/gui/qgscolorschemelist.cpp
+++ b/src/gui/qgscolorschemelist.cpp
@@ -710,7 +710,12 @@ void QgsColorSwatchDelegate::paint( QPainter *painter, const QStyleOptionViewIte
   }
 
   QRect rect = option.rect;
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
   const int iconSize = Qgis::UI_SCALE_FACTOR * option.fontMetrics.width( 'X' ) * 4;
+#else
+  const int iconSize = Qgis::UI_SCALE_FACTOR * option.fontMetrics.horizontalAdvance( 'X' ) * 4;
+#endif
+
   const int cornerSize = iconSize / 6;
   //center it
   rect.setLeft( option.rect.center().x() - iconSize / 2 );
@@ -749,7 +754,11 @@ QSize QgsColorSwatchDelegate::sizeHint( const QStyleOptionViewItem &option, cons
 {
   Q_UNUSED( index )
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
   const int iconSize = Qgis::UI_SCALE_FACTOR * option.fontMetrics.width( 'X' ) * 4;
+#else
+  const int iconSize = Qgis::UI_SCALE_FACTOR * option.fontMetrics.horizontalAdvance( 'X' ) * 4;
+#endif
   return QSize( iconSize, iconSize * 32 / 30.0 );
 }
 
diff --git a/src/gui/qgscolorwidgets.cpp b/src/gui/qgscolorwidgets.cpp
index 56cb923823d6..6bb0355e7245 100644
--- a/src/gui/qgscolorwidgets.cpp
+++ b/src/gui/qgscolorwidgets.cpp
@@ -392,7 +392,11 @@ QgsColorWheel::~QgsColorWheel()
 
 QSize QgsColorWheel::sizeHint() const
 {
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
   int size = Qgis::UI_SCALE_FACTOR * fontMetrics().width( QStringLiteral( "XXXXXXXXXXXXXXXXXXXXXX" ) );
+#else
+  int size = Qgis::UI_SCALE_FACTOR * fontMetrics().horizontalAdvance( 'X' ) * 22;
+#endif
   return QSize( size, size );
 }
 
@@ -750,7 +754,11 @@ QgsColorBox::~QgsColorBox()
 
 QSize QgsColorBox::sizeHint() const
 {
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
   int size = Qgis::UI_SCALE_FACTOR * fontMetrics().width( QStringLiteral( "XXXXXXXXXXXXXXXXXXXXXX" ) );
+#else
+  int size = Qgis::UI_SCALE_FACTOR * fontMetrics().horizontalAdvance( 'X' ) * 22;
+#endif
   return QSize( size, size );
 }
 
@@ -981,12 +989,20 @@ QSize QgsColorRampWidget::sizeHint() const
   if ( mOrientation == QgsColorRampWidget::Horizontal )
   {
     //horizontal
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
     return QSize( Qgis::UI_SCALE_FACTOR * fontMetrics().width( QStringLiteral( "XXXXXXXXXXXXXXXXXXXXXX" ) ), Qgis::UI_SCALE_FACTOR * fontMetrics().height() * 1.3 );
+#else
+    return QSize( Qgis::UI_SCALE_FACTOR * fontMetrics().horizontalAdvance( 'X' ) * 22, Qgis::UI_SCALE_FACTOR * fontMetrics().height() * 1.3 );
+#endif
   }
   else
   {
     //vertical
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
     return QSize( Qgis::UI_SCALE_FACTOR * fontMetrics().height() * 1.3, Qgis::UI_SCALE_FACTOR * fontMetrics().width( QStringLiteral( "XXXXXXXXXXXXXXXXXXXXXX" ) ) );
+#else
+    return QSize( Qgis::UI_SCALE_FACTOR * fontMetrics().height() * 1.3, Qgis::UI_SCALE_FACTOR * fontMetrics().horizontalAdvance( 'X' ) * 22 );
+#endif
   }
 }
 
@@ -1277,7 +1293,11 @@ QgsColorSliderWidget::QgsColorSliderWidget( QWidget *parent, const ColorComponen
 
   mSpinBox = new QSpinBox();
   //set spinbox to a reasonable width
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
   int largestCharWidth = mSpinBox->fontMetrics().width( QStringLiteral( "888%" ) );
+#else
+  int largestCharWidth = mSpinBox->fontMetrics().horizontalAdvance( QStringLiteral( "888%" ) );
+#endif
   mSpinBox->setMinimumWidth( largestCharWidth + 35 );
   mSpinBox->setMinimum( 0 );
   mSpinBox->setMaximum( convertRealToDisplay( componentRange() ) );
@@ -1588,7 +1608,11 @@ void QgsColorPreviewWidget::paintEvent( QPaintEvent *event )
 
 QSize QgsColorPreviewWidget::sizeHint() const
 {
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
   return QSize( Qgis::UI_SCALE_FACTOR *  fontMetrics().width( QStringLiteral( "XXXXXXXXXXXXXXXXXXXXXX" ) ), Qgis::UI_SCALE_FACTOR * fontMetrics().width( QStringLiteral( "XXXXXXXXXXXXXXXXXXXXXX" ) ) * 0.75 );
+#else
+  return QSize( Qgis::UI_SCALE_FACTOR * fontMetrics().horizontalAdvance( 'X' ) * 22, Qgis::UI_SCALE_FACTOR * fontMetrics().horizontalAdvance( 'X' ) * 22 * 0.75 );
+#endif
 }
 
 void QgsColorPreviewWidget::setColor2( const QColor &color )
diff --git a/src/gui/qgscompoundcolorwidget.cpp b/src/gui/qgscompoundcolorwidget.cpp
index 33632dedd939..0307ec4bf67a 100644
--- a/src/gui/qgscompoundcolorwidget.cpp
+++ b/src/gui/qgscompoundcolorwidget.cpp
@@ -65,7 +65,12 @@ QgsCompoundColorWidget::QgsCompoundColorWidget( QWidget *parent, const QColor &c
   QgsSettings settings;
 
   mSchemeList->header()->hide();
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
   mSchemeList->setColumnWidth( 0, static_cast< int >( Qgis::UI_SCALE_FACTOR * fontMetrics().width( 'X' ) * 6 ) );
+#else
+  mSchemeList->setColumnWidth( 0, static_cast< int >( Qgis::UI_SCALE_FACTOR * fontMetrics().horizontalAdvance( 'X' ) * 6 ) );
+#endif
+
 
   //get schemes with ShowInColorDialog set
   refreshSchemeComboBox();
diff --git a/src/gui/qgsdetaileditemdelegate.cpp b/src/gui/qgsdetaileditemdelegate.cpp
index 9c332e01fe8a..223f420b2f9b 100644
--- a/src/gui/qgsdetaileditemdelegate.cpp
+++ b/src/gui/qgsdetaileditemdelegate.cpp
@@ -253,7 +253,7 @@ void QgsDetailedItemDelegate::paintAsWidget( QPainter *thepPainter,
   {
     drawHighlight( option, thepPainter, height( option, data ) );
   }
-  QPixmap myPixmap = QPixmap::grabWidget( mpWidget );
+  QPixmap myPixmap = mpWidget->grab();
   thepPainter->drawPixmap( option.rect.x(),
                            option.rect.y(),
                            myPixmap );
@@ -348,7 +348,7 @@ QStringList QgsDetailedItemDelegate::wordWrap( const QString &string,
       myPreviousSpacePos = i;
     }
     myCumulativeLine += myChar;
-    if ( metrics.width( myCumulativeLine ) >= width )
+    if ( metrics.boundingRect( myCumulativeLine ).width() >= width )
     {
       //time to wrap
       //TODO deal with long strings that have no spaces
diff --git a/src/gui/qgsfieldexpressionwidget.cpp b/src/gui/qgsfieldexpressionwidget.cpp
index 3ca57b3f5ac7..eb5955de5009 100644
--- a/src/gui/qgsfieldexpressionwidget.cpp
+++ b/src/gui/qgsfieldexpressionwidget.cpp
@@ -323,7 +323,7 @@ void QgsFieldExpressionWidget::currentFieldChanged()
 
   // display tooltip if widget is shorter than expression
   QFontMetrics metrics( mCombo->lineEdit()->font() );
-  if ( metrics.width( fieldName ) > mCombo->lineEdit()->width() )
+  if ( metrics.boundingRect( fieldName ).width() > mCombo->lineEdit()->width() )
   {
     mCombo->setToolTip( fieldName );
   }
diff --git a/src/gui/qgsfontbutton.cpp b/src/gui/qgsfontbutton.cpp
index 2018fe20f2bf..1bcbfaf0bfbb 100644
--- a/src/gui/qgsfontbutton.cpp
+++ b/src/gui/qgsfontbutton.cpp
@@ -53,7 +53,11 @@ QgsFontButton::QgsFontButton( QWidget *parent, const QString &dialogTitle )
   //make sure height of button looks good under different platforms
   QSize size = QToolButton::minimumSizeHint();
   int fontHeight = Qgis::UI_SCALE_FACTOR * fontMetrics().height() * 1.4;
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
   int minWidth = Qgis::UI_SCALE_FACTOR * fontMetrics().width( 'X' ) * 20;
+#else
+  int minWidth = Qgis::UI_SCALE_FACTOR * fontMetrics().horizontalAdvance( 'X' ) * 20;
+#endif
   mSizeHint = QSize( std::max( minWidth, size.width() ), std::max( size.height(), fontHeight ) );
 }
 
diff --git a/src/gui/qgsratiolockbutton.cpp b/src/gui/qgsratiolockbutton.cpp
index 9dbd15aa5b8d..906fce1f662f 100644
--- a/src/gui/qgsratiolockbutton.cpp
+++ b/src/gui/qgsratiolockbutton.cpp
@@ -27,7 +27,11 @@ QgsRatioLockButton::QgsRatioLockButton( QWidget *parent )
   : QToolButton( parent )
 {
   setMinimumSize( QSize( 24, 24 ) );
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
   setMaximumWidth( fontMetrics().width( QStringLiteral( "000" ) ) );
+#else
+  setMaximumWidth( fontMetrics().horizontalAdvance( '0' ) * 3 );
+#endif
   setCheckable( true );
   setAutoRaise( true );
   connect( this, &QPushButton::clicked, this, &QgsRatioLockButton::buttonClicked );
diff --git a/src/gui/raster/qgsrasterlayerproperties.cpp b/src/gui/raster/qgsrasterlayerproperties.cpp
index d966ca954ac6..dca8f84c7e25 100644
--- a/src/gui/raster/qgsrasterlayerproperties.cpp
+++ b/src/gui/raster/qgsrasterlayerproperties.cpp
@@ -76,6 +76,7 @@
 #include <QVector>
 #include <QUrl>
 #include <QMenu>
+#include <QScreen>
 
 QgsRasterLayerProperties::QgsRasterLayerProperties( QgsMapLayer *lyr, QgsMapCanvas *canvas, QWidget *parent, Qt::WindowFlags fl )
   : QgsOptionsDialogBase( QStringLiteral( "RasterLayerProperties" ), parent, fl )
@@ -440,7 +441,14 @@ QgsRasterLayerProperties::QgsRasterLayerProperties( QgsMapLayer *lyr, QgsMapCanv
 
 #ifdef WITH_QTWEBKIT
   // Setup information tab
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 10, 0)
   const int horizontalDpi = qApp->desktop()->screen()->logicalDpiX();
+#else
+  QScreen *screen = QGuiApplication::screenAt( mapToGlobal( QPoint( width() / 2, 0 ) ) );
+  const int horizontalDpi = screen->logicalDotsPerInchX();
+#endif
+
   // Adjust zoom: text is ok, but HTML seems rather big at least on Linux/KDE
   if ( horizontalDpi > 96 )
   {