Transfer Window Planner Mod is an useful mod with some advances.
This mod lets you visualise planetary transfer efficiency in-game. Using it you can select your planet of Origin and planet of Destination and it will present you with details about the required Delta-V to travel from Origin to Destination.
How to use:
You access the tool by clicking on the Porkchop icon in either the AppLauncher or Common Toolbar – your choice – then follow the instructions in the main window. Once you have selected a transfer you can use the Copy buttons to copy that text to any other plugin or window.
Test it and leave some feedback.