Tile Size (centimetres) Number of tiles per metre2 Standard quantity of tiles per box Number of tiles needed to cover “x” square metres: (NB Please remember to add 10% extra tiles to your quantity to allow for cutting)       1 2 3 4 5 6 7 8 9 10 15 20 30 40 50 10x10 100 100 100 200 300 400 500 600 700 800 900 1000 1500 2000 3000 4000 5000 10x30 33.3 33 33 67 100 133 167 200 233 267 300 333 500 667 1000 1333 1667 10x45 22.2 22 22 44 67 89 111 133 156 178 200 222 333 444 667 889 1111 11.7x60 14.4 14 14 28 43 57 71 85 100 114 128 142 214 285 427 570 712 12x12 69.4 69 69 139 208 278 347 417 486 556 625 694 1042 1389 2083 2778 3472 12.5x33.3 24 24 24 48 72 96 120 144 168 192 216 240 360 480 721 961 1201 13x13 59 59 59 118 178 237 296 355 414 473 533 592 888 1183 1775 2367 2959 735 1102 1469 1837 20x20 25 25 25 50 75 100 125 150 175 200 225 250 375 500 750 1000 1250 20.5x20.5 23.7 24 24 48 71 95 119 143 167 190 214