You will need more than javascript for this. Despite the gossip of the web guru, I have earned. You need IIS and Excel on the server. People get stuck on second demand, but you have to use what is available. SpreadSheet Gear - an alternative.
But the first question you need to ask yourself is, do you really need a web interface? I would explore creating your front-end in excel; with a cell mapping tab that displays your user interface elements in the cells of your calculator spreadsheet and the macro copies / pastes contents from one table to another.
The beauty of this setting is that you can run a batch through a calculator spreadsheet.
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