I need a Wordpress plugin or custom code creating from a complex spreadsheet

General information for the website: 4,000 plus visits to website a month, government organisation Kind of development: Customization of existing website Num. of web pages/modules: 1 Description of every page/module: I have a spreadsheet of a cost flow model which currently has 6 user inputs to then calculate 6 outputs that highlight cost estimates Description of requirements/features: This is a complex and I would like to look at scoping these requirements first to see if they will work effectively before translating into a plugin. Specific technologies required: Excel, PHP, WordPress Extra notes: