Tile Calculator
Work out how many tiles and boxes you need for a floor or wall, including a waste allowance.
How this calculator works
Tiles needed = room area ÷ single-tile area, rounded up. We add your chosen waste percentage — 10% is typical for a straight lay, more for diagonal or patterned layouts — to get the amount to actually buy.
Room dimensions use feet or meters; tile dimensions use the smaller matching unit (inches or centimeters), since tiles are sized far smaller than the room itself.
All calculations run in your browser only — nothing you type is sent to a server. Results are estimates for planning purposes; always round up and buy a small surplus for cuts, waste, and future repairs.
Example calculations
10 × 8 ft room, 12 × 12 in tiles, 10% waste
80 tiles needed → 88 with waste → 9 boxes at 10 tiles/box.
Same room, diagonal layout
Increase waste to 15–20% for the extra angled cuts a diagonal lay needs.
Frequently asked questions
How much waste allowance should I use for tile?
10% is standard for a straight lay. Diagonal layouts, herringbone patterns, or rooms with lots of corners and fixtures to cut around should use 15–20%.
Should I buy tiles from the same batch?
Yes — tile color and shade can vary slightly between production batches, so buying enough from one batch (including your waste allowance) avoids a visible mismatch partway through.
Does grout width affect how many tiles I need?
Grout lines take up a small amount of space between tiles, but for most standard grout widths (1/8–3/16 in) the effect on total tile count is small enough that the waste allowance already covers it.