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Mosaic Tile Calculator

Calculate how much tile you will need.

How much tile do you need?  You'll know in just 4 quick steps . . .

1.  Measure Your Surface

Measure the dimensions of the surface you would like to mosaic and calculate the area using the formulas from elementary school:

RECTANGLE AREA = length x width

TRIANGLE AREA = 1/2 x width x height

CIRCLE AREA = 0.785 x diameter x diameter

Keep in mind that 1 ft2 is 144 in2.  If you get your answer in square inches, just divide by 144 to get the answer in square feet.  

2.  Look Up An Estimate

Now look up an estimate of the number of mosaic tiles you need based on square footage.  These estimates assume a grout spacing of 1/16" between the tiles.  Remember that 1 ft2 is 144 in2 .  The first three columns refer to mosaic marble stone of different types.  The forth column refers to 3/4" glass mosaic tile.

  number
3/8"
stones
number
9/16"
stones
number
3/8"
tiles
number
3/4"
tile
sheets
iridescent
tile
1 ft2 752 369 752 218 10
2 ft2 1505 737 1505 436 20
3 ft2 2257 1106 2257 654 31
4 ft2 3009 1475 3009 873 41
5 ft2 3762 1843 3762 1091 51
6 ft2 4514 2212 4514 1309 61
7 ft2 5266 2580 5266 1527 72
8 ft2 6019 2949 6019 1745 82
9 ft2 6771 3318 6771 1963 92
10 ft2 7523 3686 7523 2181 102

3.  Are You Cutting the Tiles?

Cutting a mosaic tile in pieces theoretically decreases the amount of tile you need.  How is this so?  You will have more pieces, so there will be more grout lines in the mosaic.  More grout lines means more grout and less mosaic tile.  The effect can be significant.  For example, it requires 218 of the 3/4" glass mosaic tiles to cover 1 square foot with a grout spacing of about 1/16 inch, but if you cut the tiles into pieces, you might only need 200 tiles.  On the other hand, people who cut tile probably should budget a little extra as waste.  That's why we use 218 per square foot as a rule of thumb for 3/4" mosaic tile.

4.  Consider the Spacing Between Tiles

Tile coverage is determined as much by the grout spacing between the tiles as it is by the area you are covering.  All of the calculations in our tables assume a grout spacing of 1/16" between the mosaic tiles.  This spacing is common with stone, ceramic and glass mosaic tile because it ensures enough grout will penetrate between the tiles and seal over the adhesive underneath.  It also provides enough gap between the tiles to ensure that the tiles are visually distinct at a distance so that the mosaic does not look like one big piece.  For advice about choosing a grout color, see our page of Mosaic Instructions.

Note that 3/4" glass mosaic tile sometimes comes face-mounted on paper so that the installer can glue the whole sheet to a wall and then peel the paper off the face of the tile and then grout.  These sheets are made according to metric standards, so that the grout spacing is slightly larger than 1/16".  Typically there are 225 tiles mounted on a sheet that is 1.15 square feet.  Our metallic glass mosaic tiles and swirled glass mosaic tiles are cut from such sheets.  Most artists remove the tiles from the sheets before using, so this doesn't matter.

RECTANGLE AREA = length x width

length
inch

width
inch

area
ft2

12

12

1

12

24

2

24

24

4

24

48

8

48

48

16

TRIANGLE AREA = 1/2 x width x height

length
inch

width
inch

area
ft2

12

12

0.5

12

24

1

24

24

2

24

48

4

48

48

8

CIRCLE AREA = 0.785 x diameter x diameter

diameter
inch

area
ft2

12

0.8

18

1.8

24

3.1

30

4.9

36

7.1

48

12.6