CustomCalc offers 10 dimensional groups listed above to convert from any unit to another.
Any of these Unit Conversion Function can be assigned to any place in the keyboard (as any other in CustomCalc) so you can execute it in just one click (or touch), avoiding the need to browse for it.
Also in CustomCalc, all functions are available though the menu so you don't need to assign a function to the keyboard to execute it only once.
Dimensional units group