diff --git a/src/printsupport/kernel/qplatformprintersupport_qpa.cpp b/src/printsupport/kernel/qplatformprintersupport_qpa.cpp
index aeb4599955..b6f65ee893 100644
--- a/src/printsupport/kernel/qplatformprintersupport_qpa.cpp
+++ b/src/printsupport/kernel/qplatformprintersupport_qpa.cpp
@@ -124,6 +124,26 @@ void QPlatformPrinterSupport::setPrinterInfoCupsPrinterIndex(QPrinterInfo *p, in
 #endif
 }
 
+/*
+    Converts QSizeF in millimeters to a predefined PaperSize (returns Custom if
+    the size isn't a standard size)
+*/
+QPrinter::PaperSize QPlatformPrinterSupport::convertQSizeFToPaperSize(const QSizeF &sizef)
+{
+    extern QPrinter::PaperSize qSizeFTopaperSize(const QSizeF &);
+    return qSizeFTopaperSize(sizef);
+}
+
+/*
+    Converts a predefined PaperSize to a QSizeF in millimeters (returns
+    QSizeF(0.0, 0.0) if PaperSize is Custom)
+*/
+QSizeF QPlatformPrinterSupport::convertPaperSizeToQSizeF(QPrinter::PaperSize paperSize)
+{
+    extern QSizeF qt_paperSizeToQSizeF(QPrinter::PaperSize size);
+    return qt_paperSizeToQSizeF(paperSize);
+}
+
 QT_END_NAMESPACE
 
 #endif // QT_NO_PRINTER
diff --git a/src/printsupport/kernel/qplatformprintersupport_qpa.h b/src/printsupport/kernel/qplatformprintersupport_qpa.h
index 53f5900cce..5dba56579c 100644
--- a/src/printsupport/kernel/qplatformprintersupport_qpa.h
+++ b/src/printsupport/kernel/qplatformprintersupport_qpa.h
@@ -66,6 +66,9 @@ public:
     virtual QList<QPrinterInfo> availablePrinters();
     virtual QPrinterInfo defaultPrinter();
 
+    static QPrinter::PaperSize convertQSizeFToPaperSize(const QSizeF &sizef);
+    static QSizeF convertPaperSizeToQSizeF(QPrinter::PaperSize paperSize);
+
 protected:
      static QPrinterInfo printerInfo(const QString &printerName, bool isDefault = false);
      static void setPrinterInfoDefault(QPrinterInfo *p, bool isDefault);