SICIS WaterGlass Glass Mosaics Color / Style: Crimson Tile Size: 5/8" x 5/8" Sheet Size: 11-5/8" x 11-5/8" x 1/8" Thick Supplied on paper face mounted sheets. The material is sold by the sheet which equals 0.94 square feet. This is because each sheet measures 11-5/8 inch by 11-5/8 inch. We recommend adding 10-15% to your quantity for waste resulting from cuts and shaping during installation to your space. If you need assistance calculating your quantity or space dimensions, please use the chat or call customer support.