Tile Calculator
Room Size
Tile Size
Common Tile Sizes
Frequently Asked Questions
How many extra tiles should I buy?
Buy 10% extra for a standard straight lay. Buy 15% for a diagonal (45°) lay, which creates more cut waste at the edges. If your tile has a pattern that requires matching, 20% or more may be needed. Always save leftover tiles for future repairs — it's very hard to match an old tile exactly.
Does grout spacing affect the tile count?
Slightly. Grout lines effectively reduce the footprint of each tile in the layout. For most residential grout widths (1/16" to 3/8"), the effect on tile count is minor — usually less than 1%. This calculator accounts for it, but it's rarely a deciding factor in how many tiles to buy.
What size tile is best for a small room?
Larger tiles (12×24 or 24×24) can make a small room look bigger by reducing the number of grout lines. However, they require a very flat subfloor and are harder to install on walls. Medium tiles (12×12 or 12×24) are versatile. Mosaic tiles (under 4×4) work well in showers and as accents.
Should I tile under appliances and cabinets?
For floors, it's best practice to tile the full floor area before setting cabinets — it makes future renovations easier and ensures consistent height. Under fixed structural elements, tile is optional. Measure the full room regardless of what sits on top.