Create Calculator with Form

Hi,

I want to create on a website a calculator tool that allows companies to calculate their carbon emissions.

I want to do the website on WordPress and though about using a form plugin (Caldera, Weforms, Ninja, WPForms, Gravity or Formidable Forms) to do it.
What I need is a tool that can :
– calculate complicated fields (coming originally from an excel file, transposed in the form)
– Do at the end of the process Graphs and Charts presenting the results of calculations (using another plugin maybe ? how to connect charts and form plugin ? )
– Allows the client to do an account and save the form and if he quit the website, he can return on it, everything he did will be saved
– Export the data, graphs and results in an excel file, or a pdf
– Use multi pages form

Do you think a Form with wordpress would be the best tool to help me doing this platform/calculator ? If yes which one would you recommend that can do all this features ? Is there another way (maybe more appropriate) to do this platform ? Maybe coding directly in PHP ?

Thanks a lot for your answers,
Pierre F.