The HomeCraft Tile & Flooring Estimator gives you exact tile counts including waste factor, grout spacing, and pattern adjustments.
Calculating the right number of floor tiles or wall tiles is crucial before starting any tiling project. Order too few and you risk mismatched tiles from a different production batch with a slightly different color cast; order too many and you've wasted money. Our tile calculator solves this by factoring in your area's exact dimensions, your chosen tile size, grout line spacing, the tile layout pattern, and an adjustable waste percentage — giving you a single, confident material list.
The tile waste factor accounts for tiles that are cut, chipped, or discarded during installation. For a straight grid pattern aligned with the walls, a waste factor of 10% is typically sufficient. However, diagonal (45°) or herringbone patterns require significantly more cuts at the perimeter, meaning more wasted tile per row. We recommend 10–15% for diagonal patterns and up to 20% for complex herringbone or basketweave layouts. Our calculator selects a pattern multiplier automatically when you choose the pattern type, but still lets you fine-tune the final waste percentage independently.
Never skip grout spacing in your tile count calculations. Even a 1/4-inch grout line adds up significantly when multiplied across hundreds of tiles. In a 10×12 ft room with 12-inch tiles, the grout lines effectively reduce your tile count by about 2–3%, but ignoring them means your calculation overestimates coverage by that same margin. Our tile estimator adds your specified grout gap to each tile's effective laid dimensions before calculating coverage, resulting in a far more precise material list than tools that ignore grout entirely.
Tile size dramatically affects how large or small a room appears. Large-format tiles (24×24 in or bigger) make small rooms look more spacious by reducing the number of grout lines, but they require a flatter, more precisely leveled substrate. Small mosaic tiles (2×2 in or smaller) add texture and visual interest but significantly increase installation time. The most popular residential choice is the 12×12 or 18×18 inch range — large enough to be striking, small enough to manage in a typical DIY installation with minimal substrate preparation.
Q: How many tiles do I need for a 10×10 ft floor?
A: A 10×10 ft area is 100 sq ft. With 12×12 in tiles and a 10% waste factor, you need approximately 122 tiles. If they come in boxes of 10, round up to 13 boxes to ensure you have spares from the same lot.
Q: What waste factor should I use for a diagonal pattern?
A: Use 15% as a minimum for a straight diagonal and up to 20% for herringbone. The angled cuts at walls create proportionally more waste than straight layouts.
Q: Can I tile over existing tiles?
A: Yes, if the existing tiles are firmly bonded with no hollow spots, level, and the added height won't cause issues with door clearances. Use a floor grinder to scuff the surface for better adhesion. Add the height of the existing tile layer when planning transitions with adjacent flooring.
Q: How long does it take to tile a bathroom floor?
A: A typical 50 sq ft bathroom floor takes an experienced DIYer 4–6 hours to tile, plus 24 hours for adhesive curing before grouting. Allow another 24 hours before grouting and 72 hours before use.
Calculate adhesive for your tiles.
Coordinate wall and floor colors.
Plan area rugs for tiled floors.