Excel 2007 : Calculate via list box options

Hi Everyone

Another newbie here.

I have what should be a simple worksheet that will calculate the cost of a cushion based on three dimension and a square foot price. My problem is, I want to basically get all this info into one line using a list box. For instance, i have a list box containing approx 6 types of filling ie Feather, Fibre and seveal grades of foam. I have another list box that list quantities 1 through to 10. each filling has its own price.

So, what i want to do is have my customers first select a filling then enter manually the sizes ( 3 cell containing random numbers chosen by the customer), the quantity from a list box.
Cell A1 Cell B1 Cell C1 Cell D1 Cell E1 Cell F1
Filling Inches Inches Inches Quantity Price
Example: Feather 12 12 1 1 £0.92

The price in cell F1 is based on cell F1 =B1*B2*D1/144*E1*0.92

The 0.92 in the formula is the square foot price of a feather cushion.

So, the filling needs to be linked with a set sq ft price and the quantity which are all going to be list boxes where they can be calulated according to user input

If anyone can help a novies with this it would be appreciated.