Stone Floor Calculator

This calculator estimates material quantities for a natural stone tile floor: tiles, boxes, thin-set mortar, grout, sealer, and total stone weight. Stone sealer is the simplest output here -- it only responds to Room area, applying a fixed 2 coats at 200 sq ft per quart, so Tile width, Tile length, Grout joint width, Waste factor, and Tile thickness are all completely inert to Stone sealer. Total stone weight works similarly: it scales with Room area (inflated by Waste factor) and Tile thickness, since thicker stone weighs more per square foot, but Tile width and Tile length never enter the weight formula at all -- a 12x12 tile and a 24x24 tile of the same thickness covering the same floor weigh the same in this calculator.

Grout quantity is the most sensitive to tile geometry: smaller tiles pack more linear inches of grout joint into the same floor area, so Grout scales up as Tile width or Tile length shrinks, and it uses Grout joint width and Tile thickness (as the joint's depth) directly -- but Grout, unlike Tiles needed and Thin-set mortar, does not get inflated by Waste factor at all, since it is computed from the raw Room area rather than the waste-adjusted area. Boxes needed and Thin-set mortar coverage both step between three tiers based on whether a single tile's face area crosses 1 or 2 square feet, so mid-size tiles near those thresholds can round up faster than their raw square footage would suggest.