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Everyday MathFree

Tile Calculator

Estimate how many floor tiles to buy from room size and tile size in inches. Adds a standard waste allowance for cuts and breakage (default 10 percent).

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Result

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Formula

#
Core Formula
Tiles = ceil( (room sq ft / tile sq ft) x (1 + waste% / 100) ).

How it works: Room area is length times width in feet. Tile area is tile length times tile width in inches divided by 144 to get square feet per tile. The result is rounded up after applying waste.

Worked Example

Room 12 ft by 10 ft, tiles 12 in by 24 in, 10% waste:
1Step 1: Room = 120 sq ft
2Step 2: Tile = (12 x 24) / 144 = 2 sq ft each
3Step 3: Base count = 120 / 2 = 60
4Step 4: With waste = 60 x 1.10 = 66 tiles ordered

Frequently Asked Questions

Is 10 percent waste enough?

Straight layouts often use 10 percent. Diagonal patterns, large tiles, or complex rooms may need 15 percent or more.

Does this include grout lines?

Tile sizes are nominal. Thin grout lines change totals only slightly for planning purposes.

What about tile sold by the box?

Divide the calculator result by tiles per box from the packaging, then round up to whole boxes.

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