Calculation of roof tiles / Braas Tegalit

Dear Sir or Madam,

I am currently occupied with the construction of my garage.
I could use some help with this:
How many roof tiles from the company Braas, model Tegalit, are needed for a hipped roof that will be placed on a 7 x 7 m garage?
Unfortunately, the roof pitch is not yet known; I assume about 22 degrees.
I calculate about 55 sqm of required area and thus approximately 550 pieces.
Thank you very much.

Just ask Braas directly, I don't think roofers stand there calculating how many tiles they need. Or specification/m2 on the manufacturer's site!? But note that all the special tiles (ridge etc.) are also included there.