diff --git a/src/controls/sizing.cpp b/src/controls/sizing.cpp
index 4b2c8c3..09cff96 100644
--- a/src/controls/sizing.cpp
+++ b/src/controls/sizing.cpp
@@ -105,3 +105,26 @@ float Sizing::dp(float value)
 {
     return value*m_dp_factor;
 }
+
+
+void Sizing::setMmScaleFactor(float value)
+{
+    if(value != 0)
+    {
+        qDebug() << "Set custom mm scale factor";
+
+        m_p_width = value;
+        setMmScaleFactor();
+    }
+}
+
+
+void Sizing::setDpScaleFactor(float value)
+{
+    if(value != 0)
+    {
+        qDebug() << "Set custom dp scale factor";
+
+        m_dp_factor = value;
+    }
+}
diff --git a/src/controls/sizing.h b/src/controls/sizing.h
index 57fc8c1..5fe7ac1 100644
--- a/src/controls/sizing.h
+++ b/src/controls/sizing.h
@@ -37,6 +37,9 @@ class Sizing : public QObject
     Q_INVOKABLE float mm(float value);
     Q_INVOKABLE float dp(float value);
 
+    Q_INVOKABLE void setMmScaleFactor(float value);
+    Q_INVOKABLE void setDpScaleFactor(float value);
+
 private:
     bool m_valid;