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Floor tile calculator (room dimensions)
Tiles for a room straight from its length and width — the calculator does the area math internally, so a hand-computed area can never slip a decimal.
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How it’s computed
Area = length × width (computed inside the calculator — dimension-first, where 10× slips can't creep in), then tiles = ceil(area × (1 + waste) ÷ tile face). Defaults: 12" tile, 10% waste.
Decimal-exact and deterministic: identical inputs always return identical results. This is the same math Ask Donnie’s estimating engine runs — not an approximation, and never a language model doing arithmetic.
Common questions
Why enter dimensions instead of area?
Because the big takeoff errors happen in hand-computed areas (a slipped decimal turns 120 sqft into 1,200). Passing raw dimensions keeps the arithmetic inside exact decimal math.
What tile sizes work?
Any square tile — enter the edge length in inches (a 12×12 tile is 12; an 18×18 is 18).
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