How This Calculator Works
Tile ordering depends on the room area, tile size, grout joints, layout waste, and box quantity. This calculator converts those details into tiles and boxes.
Formula
Tile count = project area / tile area, adjusted for grout spacing and waste, then rounded up.
Assumptions
The calculator estimates field tile. Borders, accent strips, stairs, breakage from difficult cuts, and dye-lot matching may require extra material.
Measurement Checklist
- Measure each tile field separately when walls, niches, borders, or accent strips change the layout.
- Enter actual tile dimensions and grout joint width, not only the nominal tile name.
- Increase waste for diagonal layouts, large-format tile, fragile tile, or many edge cuts.
- Estimate trim pieces, mortar, grout, spacers, and sealer separately.
Practical Examples
- A 120 sq ft room using 12 in by 24 in tiles with 10% waste needs about 66 tiles. If there are 8 tiles per box, buy 9 boxes.
- A 5 ft by 8 ft bathroom floor using 12 inch by 12 inch tile with 10% waste needs about 44 tiles, or 5 boxes if there are 10 tiles per box.
- An 18 ft by 1.5 ft backsplash using 3 inch by 12 inch subway tile with 15% waste needs roughly 125 field tiles before trim pieces.
- A 90 sq ft shower wall field using 12 inch by 24 inch tile with 15% waste needs about 52 tiles before niches, edges, or accent bands.