If a surface is 144 square feet = 20,736 sq inches, you need at least (172,8 rounded to) 173 tiles (6 by 20 inches) to cover it.
Each tile is 6 inch*20inch= 120 sq inch. 20,736 sq inch / 120 sq inch = 172,8.
Depending on the shape of the surface you may need more if you have to cut some tiles to make them fit.
440 sq feet = 440 x 144 sq inchesanswer = 440 x 144/ (20 x 20) = 440 x 144 /400 = 1.1 x 144 = 158.4 tiles ~ 159 tiles
12 X 12 = 144 inches = 1 Square Foot of tile 165 X 144 = 23760 20 X 20 = 400 23760 / 400 = 60 tiles
7.35 Is what you need
Assuming that you mean 20" x 20" (inch) tiles. 600 (square feet) x 144 (square inches in a foot) = 86400 square inches 1 tile = 400 square inches. (20 x 20) 86400 / 400 = 216 tiles. This of course, assumes a square surface, which houses rarely are. ;)
Convert 20' x 10' to inches: 20*12 " x 10*12 " = 240x120. Then find the area of both: 28800 for 20 by 10 and 144 for 12 by 12. Divide: 28800/144 is equal to 200.
440 sq feet = 440 x 144 sq inchesanswer = 440 x 144/ (20 x 20) = 440 x 144 /400 = 1.1 x 144 = 158.4 tiles ~ 159 tiles
If you mean 20 in x 20 in tiles, the 240 sq ft room is 240 x 144 sq in = 34560 sq in. each tile is 20 x20 = 400 sq in tiles needed are 34560/400 = 86.4 tiles, say 90 tiles
12 X 12 = 144 inches = 1 Square Foot of tile 165 X 144 = 23760 20 X 20 = 400 23760 / 400 = 60 tiles
Assuming they are 20 by 20 inches, then the area of a tile is 400 feet2/144. 200 feet2/(400 feet2/144) = 72
To find out how many 20-inch tiles you will need to cover 100 sq ft, you first need to calculate the area of one tile. A 20-inch square tile covers 20 x 20 = 400 sq inches. Since 1 sq ft = 144 sq inches, you divide 400 by 144 to get approximately 2.78, meaning it will take about 2.78 tiles to cover 1 sq ft. Therefore, to cover 100 sq ft, you will need about 278 tiles.
144 assuming no waste.
You will need 250 tiles. First, you must calculate how many square feet there are in each tile: 20" X 20" = 400 square inches per tile. One square foot = 144 square inches (12" X 12" = 144 square inches) So, 400 square inches per tile divided by 144 square inches per foot = 2.778. That means there are 2.778 square feet per tile. Now you can calculate how many tiles you need to cover 660 square feet: 660 square feet divided by 2.778 square feet per tile = 237.58 tiles. However, in practice, you will also need about 5% for waste (cuts, breakage or defective tiles) - so add that amount: 237.58 X 1.05 = 249.46 tiles. Round up, and you will need at least 250 tiles. If you're doing a patterned design or laying tiles on the diagonal, you'll want to increase your waste factor a little bit. Typically, folks will just round pieces up to the next full box of tiles.
7.35 Is what you need
400
360 tiles.
Assuming that you mean 20" x 20" (inch) tiles. 600 (square feet) x 144 (square inches in a foot) = 86400 square inches 1 tile = 400 square inches. (20 x 20) 86400 / 400 = 216 tiles. This of course, assumes a square surface, which houses rarely are. ;)
Convert 20' x 10' to inches: 20*12 " x 10*12 " = 240x120. Then find the area of both: 28800 for 20 by 10 and 144 for 12 by 12. Divide: 28800/144 is equal to 200.