Tile calculator
Add your floor or wall areas and pick the tile. You get the tiles and boxes to order, the grout in pounds, and the bags of thinset.
Inputs
Result
| Item | Order |
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How it is worked out
100 sq ft of 12 x 12 in tile with 1/8 in joints is 98 tiles exact, 108 with 10% waste. The joints hold 112.5 cu in of grout, about 7 lb of sanded grout, so one 10 lb bag with room to spare.
Thinset
Coverage depends on the trowel. A bigger notch leaves a thicker bed, so the bag covers less: about 90 sq ft per 50 lb bag with a 3/16 in V-notch, 80 with a 1/4 x 1/4 in square notch, 60 with 1/4 x 3/8 in, and 35 with 1/2 x 1/2 in, in line with Custom Building Products and LATICRETE data sheets. Back-buttering large tiles uses more.
Waste
Straight layouts need about 10% for cuts and breakage. Diagonal and herringbone patterns cut every edge tile, so allow 15%. Buy all the tile from one lot, since colour varies between runs, and keep a box for repairs.
Questions
How many tiles do I need?
Divide 144 by the tile's length times its width, each with one joint added, to get tiles per square foot. Multiply by the area and add 10%. 100 sq ft of 12 x 12 in tile with 1/8 in joints takes 108 tiles.
How much grout do I need?
It depends on joint width, tile size and thickness. 100 sq ft of 12 x 12 x 3/8 in tile with 1/8 in joints takes about 7 lb of sanded grout; 1/4 in joints double it.
How much thinset do I need?
With a 1/4 x 3/8 in square-notch trowel, about one 50 lb bag per 60 sq ft. Large-format tile on a 1/2 x 1/2 in notch takes a bag per 35 sq ft or so.
How much extra tile should I buy?
10% for straight layouts, 15% for diagonal or herringbone. Keep the leftover box for repairs.
How many 12x24 tiles are in a square foot?
Half a tile. With a 1/8 in joint, 100 sq ft takes just over 49 tiles before waste, so 55 with 10%.
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