Incorporating Excel

I have been asked to create a website that is pretty much out of my league. It involves a home page where the user can work out how much the price of a shipment will be depending on the mass and size from a series of drop down menu’s. The website will then calculate the answer. The guy, wants it done through excel so that the data comes back this way, because its easier for him to work everything out.

Anyone got any ideas how or where I could start?

I have got an example in excel here but am unable to upload it so anyone is welcome to email me and I will send it on.

Thanks

George