--- /dev/null
+#ifndef __UNITS_H__
+#define __UNITS_H__
+
+#include <QString>
+#include "structs.h"
+
+#define INCHES_TO_MM 25.4
+#define MM_TO_INCHES (1.0 / 25.4)
+
+QString GetDimensionText(Container *, double);
+QString MakeFraction(double, int);
+
+#endif // __UNITS_H__