Website with calculator.

Website Project
I am requiring a website home page. The home page will allow someone with a user name and a password to access a Excel calculator created by me. The calculator must reside on the website for accessibility by approved personnel. The website calculator must prevent tampering while having certain limited user friendly cells for inputting critical data. Once the data is input, the remainder of cells should automatically calculate. Once a user has completed working on the calculator they should have the ability to download the information in a pdf format onto a legal size 8 ½” x 11 sheet.
In addition, I would like the following:
1) The website should track all activity.
- User
- Time on the site
- A copy of all pdf calculator results
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2) The calculator must be updateable with each revision kept in a back-up file.
3) All calculator formulas should not be viewable by users with the website code password protected.
4) It would be preferable that the calculator be constructed in a manner that Petro-logic, LLC (owner) be allowed to update it. A beta calculator should be created to insure any updated calculator is in accurate working order prior to allowing user access.
5) Petro-logic will provide content for the Home page.
6) Contractor will assist in setting up Petro-logic.com email addresses.
- info@petro-logicusa.com
- contact@petrologicusa.com
- Scott.orth@petro-logicusa.com
- sales@petro-logicusa.com
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7) The website should be expandable for additional website pages in the future. Probably Q3 & Q4 of 2023.
8) Calculator should have notes or tutorial or video on how to use.
9) SEO