How many sf in a 18x18 tile?

To calculate the square footage of an 18x18 tile, you multiply the length by the width. Thus, 18 inches multiplied by 18 inches equals 324 square inches. To convert square inches to square feet, divide by 144 (since there are 144 square inches in a square foot). Therefore, an 18x18 tile covers 2.25 square feet.