Tiles, Thinset Bags & Grout for Your Floor
Tell it your floor size and tile dimensions and get back tile count, thinset bags, and a grout estimate, cutting waste folded into every number.
How it works
Tile is a coverage problem with two helpers riding along. First the tiles: one tile covers its own face area, so a 12" × 12" tile covers 1 sq ft, an 18" × 18" about 2.25 sq ft, and so on. Take the floor area, add a waste allowance, and divide by the tile's face area to get the tile count. It rounds up, because partial tiles are cut from whole ones and you want spares in the same shade lot.
Thinset comes next. A 50 lb bag of modified thinset covers roughly 90 sq ft at a 1/4" square-notch trowel — the common size for small and medium tile. Large-format tile needs a deeper notch and covers less per bag, so treat the bag count as a floor, not a ceiling.
Grout fills the joints. The estimate here assumes a 1/8" joint at 1/4" depth; the volume rises fast with wider joints and bigger tile spacing. For a precise grout number by joint width and depth, use the dedicated grout-volume calculator. To preview the exact cut tiles at your walls, use the tile-layout calculator.
floor area = 10 × 12 = 120 sq ft
tiles = 120 × 1.10 ÷ 1 sq ft = 132 tiles
thinset = 132 sq ft ÷ 90 = 1.47 → 2 bags · grout ≈ 1.6 L