Tile Flooring Calculator
Buy the right number of tiles the first trip. Enter your room size, tile size, and how many tiles come in a box — the calculator figures out the raw tile count, adds your waste allowance, and rounds up to whole boxes.
Enter your numbers
Your results
Estimate only — thinset, grout, and underlayment are separate. See the related calculators below.
How to use this calculator
Measure the room's length and width in feet at the widest points. For L-shaped or otherwise irregular rooms, split the floor into rectangles, run the numbers for each, and add the tile totals together.
Enter the tile dimensions in inches and the tile count printed on the box. The calculator computes how many tiles cover the floor, adds your waste percentage for cuts and breakage, and rounds up to whole boxes — stores won't sell you half a box.
How it works
Room area in square feet = length × width. One tile's coverage = (tile length × tile width) ÷ 144, since 144 square inches make a square foot. Raw tiles = room area ÷ tile coverage, rounded up; then waste is applied and the total is rounded up again to full boxes: boxes = round-up(tiles with waste ÷ tiles per box).
For example, a 10 × 12 ft room is 120 sq ft. A 12 × 12 in tile covers 1 sq ft, so 120 raw tiles; +10% waste gives 132 tiles, and at 12 tiles per box that's 11 boxes to order. Grout joints eat a little area, but the waste allowance covers it.
Frequently asked questions
How much extra tile should I buy?
10% for straight layouts, 15%+ for diagonal or large-format tile — attic stock for future repairs is wise.
Does this include grout or thinset?
No. See our grout and thinset calculators for setting materials.
What about irregular rooms?
Break L-shaped rooms into rectangles, calculate each, and add the totals.
Do I need to subtract fixtures?
For toilets and vanities, pros often skip subtracting — the 'waste' covers it.