Excel to online form - repost

I have an Excel sheet that I want to transform into an online form. The user will input some data in the online form and Excel does the calculations to give an online instant cost. I have attached the file, which has two sheets: one for the calculations and another one for the design. The form is now in English just for the sake of communication but I will translate it in Greek when it is finished. I should be able to upload this form at my site where it is going to be used.