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Calculating how many tiles in a room

· 12"X12" is DUH 144 sq inches & 1 sq foot

· so multiply any tile size by its 2 dimensions ie 12"X12" or 16"X16" divide by 144 & that = the sq ft per tile.

· 13"X13" is 169 sq inches divided by 144 sq inches in a sq foot =1.174 per tile

· 18"X18" is 324 sq inches per tile divided by 144 sq inches per sq ft= 2.25 sq ft per tile

· 20"x20" tiles are 2.778 per tile

· 24X24 tiles are 4 sq ft per tile

Formula would look like this

(Tile L"x W"= sq inches)divided by 144 sq inches=sq ft per tile) room area divided by sq ft per tile= how many tiles

Soooo once you know the sq feet you need, add a little for waste & breakage & ooops cuts & you will have enough..

Q: How many 18x18 tiles do you need for 40sq ft room?

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288

71.11 (72) plus 20%

You'll need 200 18-inch tiles.

30 tiles! But you'll need more than 30 tiles to cover wastage, breakage, etc.

71 and 1/2 Get 80 to be safe.

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288

12...

71.11 (72) plus 20%

144/2.25=64. 18x18 tile cover 2.25 sq ft area.

You'll need 200 18-inch tiles.

94 (93.33)

Depends on how many are in each box?

30 tiles! But you'll need more than 30 tiles to cover wastage, breakage, etc.

71 and 1/2 Get 80 to be safe.

To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.

18" x 18" = 1.5' x 1.5' = 2.25 square feet90/2.25 = 40 tiles.

The answer will depend on the units used for measuring the tiles which you have failed to specify.