diff --git a/src/app/puzzle/layout/vppiece.cpp b/src/app/puzzle/layout/vppiece.cpp
index cf385fb76..775300376 100644
--- a/src/app/puzzle/layout/vppiece.cpp
+++ b/src/app/puzzle/layout/vppiece.cpp
@@ -49,9 +49,9 @@ QT_WARNING_POP
 
 namespace
 {
-constexpr qreal minStickyDistance = 3 / 25.4 * PrintDPI; // 3 mm
-constexpr qreal maxStickyDistance = 10 / 25.4 * PrintDPI; // 10 mm
-constexpr qreal stickyShift = 1 / 25.4 * PrintDPI; // 1 mm
+constexpr qreal minStickyDistance = MmToPixel(3.);
+constexpr qreal maxStickyDistance = MmToPixel(10.);
+constexpr qreal stickyShift = MmToPixel(1.);
 
 //---------------------------------------------------------------------------------------------------------------------
 auto CutEdge(const QLineF &edge) -> QVector<QPointF>
diff --git a/src/app/puzzle/vptilefactory.h b/src/app/puzzle/vptilefactory.h
index 403d9000a..8b9725b66 100644
--- a/src/app/puzzle/vptilefactory.h
+++ b/src/app/puzzle/vptilefactory.h
@@ -95,7 +95,7 @@ public:
     /**
      * @brief tileStripeWidth the width of the info / glueing stripe in Px
      */
-    static constexpr qreal tileStripeWidth = 10.0 / 25.4 * PrintDPI; // 1 cm to pixels
+    static constexpr qreal tileStripeWidth = CmToPixel(1.0);
 
     auto WatermarkData() const -> const VWatermarkData &;
 
diff --git a/src/libs/vgeometry/vabstractcurve.cpp b/src/libs/vgeometry/vabstractcurve.cpp
index e292b173d..02fe1a5a2 100644
--- a/src/libs/vgeometry/vabstractcurve.cpp
+++ b/src/libs/vgeometry/vabstractcurve.cpp
@@ -40,10 +40,6 @@
 #include "../vmisc/compatibility.h"
 #include "../ifc/exception/vexceptionobjecterror.h"
 
-#if defined(__cpp_constexpr) && __cpp_constexpr-0 < 201304
-const qreal VAbstractCurve::minLength = ToPixel(1, Unit::Mm);
-#endif
-
 VAbstractCurve::VAbstractCurve(const GOType &type, const quint32 &idObject, const Draw &mode)
     :VGObject(type, idObject, mode), d (new VAbstractCurveData())
 {}
diff --git a/src/libs/vgeometry/vabstractcurve.h b/src/libs/vgeometry/vabstractcurve.h
index b4f9949b0..71cd2365c 100644
--- a/src/libs/vgeometry/vabstractcurve.h
+++ b/src/libs/vgeometry/vabstractcurve.h
@@ -112,11 +112,7 @@ public:
 
     void SetAliasSuffix(const QString &aliasSuffix) override;
 
-#if defined(__cpp_constexpr) && __cpp_constexpr-0 >= 201304
-    static constexpr qreal minLength = ToPixel(1, Unit::Mm);
-#else
-    static const qreal minLength;
-#endif
+    static constexpr qreal minLength = MmToPixel(1.);
 
 protected:
     virtual void CreateName() =0;
diff --git a/src/libs/vgeometry/vellipticalarc.cpp b/src/libs/vgeometry/vellipticalarc.cpp
index 0ca6a3696..f9da95246 100644
--- a/src/libs/vgeometry/vellipticalarc.cpp
+++ b/src/libs/vgeometry/vellipticalarc.cpp
@@ -214,7 +214,7 @@ auto JoinVectors(const QVector<QPointF> &v1, const QVector<QPointF> &v2) -> QVec
 
     v = v1;
 
-    constexpr qreal accuracy = (0.0001/*mm*/ / 25.4) * PrintDPI;
+    constexpr qreal accuracy = MmToPixel(0.0001);
 
     for (auto p : v2)
     {
diff --git a/src/libs/vgeometry/vgeometrydef.h b/src/libs/vgeometry/vgeometrydef.h
index 75f2119cf..28571e649 100644
--- a/src/libs/vgeometry/vgeometrydef.h
+++ b/src/libs/vgeometry/vgeometrydef.h
@@ -97,7 +97,7 @@ private:
 };
 Q_DECLARE_METATYPE(VLayoutPassmark)
 
-constexpr qreal accuracyPointOnLine = (0.1555/*mm*/ / 25.4) * PrintDPI;
+constexpr qreal accuracyPointOnLine = MmToPixel(0.1555);
 
 Q_REQUIRED_RESULT static inline bool VFuzzyComparePoints(const QPointF &p1, const QPointF &p2,
                                                          qreal accuracy = accuracyPointOnLine);
diff --git a/src/libs/vlayout/vabstractpiece.cpp b/src/libs/vlayout/vabstractpiece.cpp
index 456f0401b..2126a56ba 100644
--- a/src/libs/vlayout/vabstractpiece.cpp
+++ b/src/libs/vlayout/vabstractpiece.cpp
@@ -54,7 +54,7 @@ const quint16 VAbstractPieceData::classVersion = 3;
 const qreal maxL = 3.5;
 
 const qreal VSAPoint::passmarkFactor = 0.5;
-const qreal VSAPoint::maxPassmarkLength = (10/*mm*/ / 25.4) * PrintDPI;
+const qreal VSAPoint::maxPassmarkLength = MmToPixel(10.);
 const qreal VSAPoint::minSAWidth = accuracyPointOnLine + accuracyPointOnLine*0.5;
 
 namespace
diff --git a/src/libs/vlayout/vabstractpiece.h b/src/libs/vlayout/vabstractpiece.h
index beab83021..b830d147c 100644
--- a/src/libs/vlayout/vabstractpiece.h
+++ b/src/libs/vlayout/vabstractpiece.h
@@ -246,7 +246,7 @@ auto VAbstractPiece::RemoveDublicates(const QVector<T> &points, bool removeFirst
     p.append(ConstFirst(points));
 
     // Default accuracy is not enough
-    constexpr qreal accuracy = (0.5/*mm*/ / 25.4) * PrintDPI;
+    constexpr qreal accuracy = MmToPixel(0.5);
 
     for (int i = 0; i < points.size(); ++i)
     {
diff --git a/src/libs/vlayout/vposter.cpp b/src/libs/vlayout/vposter.cpp
index 7c2b2b986..4f0155b7b 100644
--- a/src/libs/vlayout/vposter.cpp
+++ b/src/libs/vlayout/vposter.cpp
@@ -120,7 +120,7 @@ QPixmap WatermarkImageFromCache(const VWatermarkData &watermarkData, const QStri
 
 //---------------------------------------------------------------------------------------------------------------------
 VPoster::VPoster(const QPrinter *printer)
-    :printer(printer), allowance(static_cast<quint32>(qRound(10./25.4*PrintDPI)))//1 cm
+    :printer(printer), allowance(static_cast<quint32>(qRound(CmToPixel(1.))))
 {
 }
 
diff --git a/src/libs/vmisc/def.h b/src/libs/vmisc/def.h
index 3d2d3cb8e..e43af650a 100644
--- a/src/libs/vmisc/def.h
+++ b/src/libs/vmisc/def.h
@@ -375,17 +375,21 @@ const int userMaterialPlaceholdersQuantity = 20;
 QPixmap QPixmapFromCache(const QString &pixmapPath);
 void SetItemOverrideCursor(QGraphicsItem *item, const QString & pixmapPath, int hotX = -1, int hotY = -1);
 
+template<typename T> Q_DECL_CONSTEXPR inline auto MmToPixel(T val) -> T { return (val / 25.4) * PrintDPI; }
+template<typename T> Q_DECL_CONSTEXPR inline auto CmToPixel(T val) -> T { return ((val * 10.0) / 25.4) * PrintDPI; }
+template<typename T> Q_DECL_CONSTEXPR inline auto InchToPixel(T val) -> T { return val * PrintDPI; }
+
 //---------------------------------------------------------------------------------------------------------------------
-Q_DECL_RELAXED_CONSTEXPR inline double ToPixel(double val, const Unit &unit)
+Q_DECL_RELAXED_CONSTEXPR inline auto ToPixel(double val, const Unit &unit) -> double
 {
     switch (unit)
     {
         case Unit::Mm:
-            return (val / 25.4) * PrintDPI;
+            return MmToPixel(val);
         case Unit::Cm:
-            return ((val * 10.0) / 25.4) * PrintDPI;
+            return CmToPixel(val);
         case Unit::Inch:
-            return val * PrintDPI;
+            return InchToPixel(val);
         case Unit::Px:
             return val;
         default:
@@ -394,17 +398,21 @@ Q_DECL_RELAXED_CONSTEXPR inline double ToPixel(double val, const Unit &unit)
     return 0;
 }
 
+template<typename T> Q_DECL_CONSTEXPR inline auto PixelToMm(T pix) -> T { return (pix / PrintDPI) * 25.4; }
+template<typename T> Q_DECL_CONSTEXPR inline auto PixelToCm(T pix) -> T { return ((pix / PrintDPI) * 25.4) / 10.0; }
+template<typename T> Q_DECL_CONSTEXPR inline auto PixelToInch(T pix) -> T { return pix / PrintDPI; }
+
 //---------------------------------------------------------------------------------------------------------------------
-Q_DECL_RELAXED_CONSTEXPR inline double FromPixel(double pix, const Unit &unit)
+Q_DECL_RELAXED_CONSTEXPR inline auto FromPixel(double pix, const Unit &unit) -> double
 {
     switch (unit)
     {
         case Unit::Mm:
-            return (pix / PrintDPI) * 25.4;
+            return PixelToMm(pix);
         case Unit::Cm:
-            return ((pix / PrintDPI) * 25.4) / 10.0;
+            return PixelToCm(pix);
         case Unit::Inch:
-            return pix / PrintDPI;
+            return PixelToInch(pix);
         case Unit::Px:
             return pix;
         default:
@@ -414,7 +422,7 @@ Q_DECL_RELAXED_CONSTEXPR inline double FromPixel(double pix, const Unit &unit)
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-Q_DECL_RELAXED_CONSTEXPR inline qreal UnitConvertor(qreal value, const Unit &from, const Unit &to)
+Q_DECL_RELAXED_CONSTEXPR inline auto UnitConvertor(qreal value, const Unit &from, const Unit &to) -> qreal
 {
     switch (from)
     {
@@ -489,14 +497,15 @@ Q_DECL_RELAXED_CONSTEXPR inline qreal UnitConvertor(qreal value, const Unit &fro
  * @brief UnitConvertor Converts the values of the given margin from given unit to the new unit.
  * returns a new instand of QMarginsF.
  */
-Q_DECL_RELAXED_CONSTEXPR inline QMarginsF UnitConvertor(const QMarginsF &margins, const Unit &from, const Unit &to)
+Q_DECL_RELAXED_CONSTEXPR inline auto UnitConvertor(const QMarginsF &margins, const Unit &from,
+                                                   const Unit &to) -> QMarginsF
 {
     const qreal left = UnitConvertor(margins.left(), from, to);
     const qreal top = UnitConvertor(margins.top(), from, to);
     const qreal right = UnitConvertor(margins.right(), from, to);
     const qreal bottom = UnitConvertor(margins.bottom(), from, to);
 
-    return QMarginsF(left, top, right, bottom);
+    return {left, top, right, bottom};
 }
 
 void InitLanguages(QComboBox *combobox);
diff --git a/src/libs/vpatterndb/vpassmark.cpp b/src/libs/vpatterndb/vpassmark.cpp
index 70e84f917..d1e7bed66 100644
--- a/src/libs/vpatterndb/vpassmark.cpp
+++ b/src/libs/vpatterndb/vpassmark.cpp
@@ -141,7 +141,7 @@ bool FixNotchPoint(const QVector<QPointF> &seamAllowance, const QPointF &notchBa
 
     return fixed;
 }
-const qreal passmarkGap = (1.5/*mm*/ / 25.4) * PrintDPI;
+const qreal passmarkGap = MmToPixel(1.5);
 
 //---------------------------------------------------------------------------------------------------------------------
 QVector<QLineF> CreateOnePassmarkLines(const QLineF &line)
diff --git a/src/libs/vtest/abstracttest.cpp b/src/libs/vtest/abstracttest.cpp
index 84907a2cc..ab15dbb9f 100644
--- a/src/libs/vtest/abstracttest.cpp
+++ b/src/libs/vtest/abstracttest.cpp
@@ -312,7 +312,7 @@ void AbstractTest::Comparison(const QVector<QPointF> &ekv, const QVector<QPointF
 {
     // Begin comparison
     QCOMPARE(ekv.size(), ekvOrig.size());// First check if sizes equal
-    const qreal testAccuracy = (1.0/*mm*/ / 25.4) * PrintDPI;
+    const qreal testAccuracy = MmToPixel(1.);
 
     for (int i=0; i < ekv.size(); i++)
     {
diff --git a/src/libs/vwidgets/vmaingraphicsscene.cpp b/src/libs/vwidgets/vmaingraphicsscene.cpp
index a05a59370..337b71e11 100644
--- a/src/libs/vwidgets/vmaingraphicsscene.cpp
+++ b/src/libs/vwidgets/vmaingraphicsscene.cpp
@@ -155,7 +155,7 @@ void VMainGraphicsScene::InitOrigins()
 {
     origins.clear();
 
-    QPen originsPen(Qt::green, (1.2 / 3.0) /*mm*/ / 25.4 * PrintDPI, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
+    QPen originsPen(Qt::green, MmToPixel(1.2 / 3.0), Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
     QBrush axisTextBrush(Qt::green);
     const qreal arrowAngle = 35.0;
     const qreal arrowLength = 12.0;
diff --git a/src/libs/vwidgets/vtextgraphicsitem.cpp b/src/libs/vwidgets/vtextgraphicsitem.cpp
index 95d7714dd..e251a5c58 100644
--- a/src/libs/vwidgets/vtextgraphicsitem.cpp
+++ b/src/libs/vwidgets/vtextgraphicsitem.cpp
@@ -45,12 +45,12 @@
 #include "../vmisc/compatibility.h"
 #include "vtextgraphicsitem.h"
 
-const qreal resizeSquare = (3./*mm*/ / 25.4) * PrintDPI;
-const qreal rotateCircle = (2./*mm*/ / 25.4) * PrintDPI;
+const qreal resizeSquare = MmToPixel(3.);
+const qreal rotateCircle = MmToPixel(2.);
 #define ROTATE_RECT                 60
 #define ROTATE_ARC                  50
-const qreal minW = (4./*mm*/ / 25.4) * PrintDPI + resizeSquare;
-const qreal minH = (4./*mm*/ / 25.4) * PrintDPI + resizeSquare;
+const qreal minW = MmToPixel(4.) + resizeSquare;
+const qreal minH = MmToPixel(4.) + resizeSquare;
 #define ACTIVE_Z                    10
 
 namespace