Prestashop - calculate price on the fly

I have a prestashop website selling window blinds. I need it so customer can enter a desired width and height of any size and then be provided with a set price.

For example we have a window blind 610mm by 610mm, so if a customer enter a desired size of 555mm by 605mm they are given the price for the 610mm by 610mm.

we also have a window blind with size 610mm by 792mm, so if a customer enters a desired size of 555mm by 615mm they would be given the price of the 610mm by 792mm

I've attached a spreadsheet of prices to help understand.

I just need this set up or the module created and i will add all the products.

many thanks
colin.