You would need a total of 36 tiles to cover that area.
Take the are of the room and divide it by 6 and there's your answer.If the room is 8 square feet you would need 32 tiles.If the room is 8 by 8 feet you would need 256 tiles.
You would need 56 tiles to do the floor
I assume you mean an 8ft x 6ft room, which is 48ft2. I assume you mean 12in x 12in tiles, which are 1ft2 tiles. I don't know how many tiles are in a box, but you would need 48 12in x 12in tiles.
You would need 216 tiles if you left no space between them for grout.
184 would do it but get 185.
If the carpet tiles you are using are the standard 12" square, then multiple your length and width to get the square footage. In this case your room would need a minimum of 196 tiles. CHeck the box for pattern repeat and remember to add tiles for damage and waste.
If the floor tiles are measured in inches and the room is measured in feet then the tiles are 1sq feet and the room is 6x8 = 48 sq feet so you would need 48 tiles.