468 square feet. Multiply length by width - the result is the area in square feet.
There are 36 square yards in a room 18 feet by 18 feet
18 x 18 = 324 square feet
An example: A room 24 feet by 18 feet is 24 x 18 = 432 square feet.
144 square feet.
18 ft X 20 ft = 360 Square feet
45 x 18 square feet
You cannot convert '18 x 13' to square feet, because you have NOT hiven the units of '18' nor '13' .
18 x 12 = 216 square feet.
Square feet divided by 10.764 = square meters.
A simple rectangular room 20 feet by 18 feet has 360 square feet.
234 square feet.
you can't convert a linear measure - 18 feet to an area - square inches. If you meant what is 18 square feet in square inches then it is 18*12*12 - you can do the arithmetic!