I can create an interactive online calculator page / app for you

I can create a 1-page calculator app that you can use to compute just about anything.
Immediately after getting the formula for the computations, I'll send you a link to test the app and then you can embed it to your website.

Interacive Calculator apps

Calculator 1

Calculator 2

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Other features that we could include:

• Add special controls like "Date Range" from and to
• Style your form and add Dark, Light theme or add gradients
• Add Javascript validations like numeric only, with decimals, "Email only", etc
• Add Graphs & charts to your calculator app
• Add your "Conditional Formatting" or validation from your spreadsheet
• Add Multi language to your Calculator
• Add an EMAIL feature to send user's inputs to a designated email address
• Add special controls - sliders to change numbers easily

The source codes generated would be easy to understand and uses HTML5 codes. This is a carefully hand-crafted and easy to use app :)

What do we need to get started?

• Will need instructions of what the calculator should do.
• Inputs & Sample Outputs
• Formulas for each rows, Excel spreadsheet is good and clear
• Restrictions for example (Numbers only)
• If you have sample related webpage of a working similar calculator