If the tiles are 3'X3' - when you add the edge piece to a tile, now much extra length does it add to the total as my room is exactly 9'X9,' but I am afraid the edges will add an extra couple of inches when attached and then it will not fit?

When you interlock our 3/8" Sport-Lock Rubber Tiles, you will lose about an inch. This inch is made back up by the edging. So you would need 9 tiles to cover that space.
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