Calculate how many tiles you need to cover a room, based on the room size, tile size and a waste allowance for cuts.
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This calculator divides your room's area by a single tile's area to find the number of tiles needed to cover it, then adds your chosen waste percentage on top to account for cuts, breakage and pattern matching, before rounding up to a whole number of tiles.
10% is a common default for straight tile layouts. Diagonal layouts, rooms with lots of corners or fixtures, or large-format tiles that are harder to cut efficiently often warrant a higher allowance, sometimes 15-20%.
For a 12 ft × 10 ft room (120 sq ft) using 12 in × 12 in tiles (1 sq ft each) with a 10% waste allowance: area including waste = 120 × 1.10 = 132 sq ft. Dividing by the 1 sq ft tile area gives exactly 132 tiles needed.
Entering tile dimensions in feet instead of inches, this calculator's tile length and width fields expect inches, entering the room's units by mistake will produce a wildly incorrect tile count.
Using too low a waste allowance for a diagonal layout or a room with lots of corners and fixtures, those layouts need significantly more cutting, a 10% allowance meant for a simple straight layout can leave you short.
Forgetting that grout line width isn't factored in separately, this calculator uses the tile's stated size directly, for most standard grout widths this has only a small effect, but very wide grout lines with small tiles can meaningfully shift the real count.
No, this calculator uses the tile's stated size and doesn't separately account for grout line width, which has only a small effect on the total tile count for most standard grout widths.
It's a good idea to round up to the nearest full box, and consider keeping a few extra tiles on hand for future repairs, since matching a discontinued tile later can be difficult.
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