figure out
phrasal verb with figure verb uk/ˈfɪɡər/ us
to understand or solve something:
figure out how/why/what, etc. If they know the cause of the problem, they might be able to figure out how to prevent it happening again.
It takes most people some time to figure out new software.
to calculate an amount:
It is difficult to access funding before the elements of an outline business plan have been figured out.