Hello, and thank you for your question. The website can calculate this for you, simply enter the tiles quantity in and add to basket, view basket and the website will have estimated the essential products such as sealer grout and adhesive. They are natural stone and are porous the sealer is to help protect against staining. For cutting we would recommend a wet cutter, and consulting with a professional tiler.
Im looking to order 20m of opus grey tumbled limestone please could you advise on quantities of grout needed. Thanks