Custom Calculator

A custom made, simple wallpaper calculator for WP website
Not looking for the entire room calculation. Just one wall will do.
Input fields envisaged are as follows:

1- Design of choice (dropdown menu)
2 - Wall dimensions input fields:
- Height
- Width

3 - Wallcovering of Choice:
Dropdown menu: Wallpaper or Mural

4 - Price per unit / roll :
Pre populated by design choice?

5 - Total needed (result)

6- 10% added

7 - Total rolls (rounded up)