Floor tile calculator: how many tiles and boxes
Free tool
Enter your floor size and tile size. You get the number of tiles, the boxes to order and the skirting length, with wastage already added.
Floor details
How the tile calculator works
It multiplies length by width, removes any area you will not tile, then divides by the area of one tile. It adds wastage for cuts and breakage and rounds up to whole boxes.
Formula: tiles = (length × width − area left out) ÷ area of one tile × (1 + wastage). Boxes = tiles ÷ tiles per box, rounded up.
How much wastage to allow
| Layout | Allowance |
|---|---|
| Straight lay, rectangular room | 5% |
| Rooms with many cuts, L-shapes, large tiles | 10% |
| Diagonal, herringbone, patterned lay | 15% |
Large 800 × 1600 mm slabs crack easily and waste more at the edges, so lean to the higher figure.
Questions, answered
How many 2 × 2 ft tiles do I need for a 14 × 11 ft room?
A 14 × 11 ft room is 154 sq ft. One 2 × 2 ft (600 × 600 mm) tile covers about 3.88 sq ft, so you need about 40 tiles, or 44 with 10% wastage. That is 11 boxes of 4.
How much extra tile should I buy?
Buy 5% extra for a simple straight lay and 10% for most rooms. Choose 15% for diagonal or patterned layouts. Keep a spare box for future repairs.
Do I need to count the area under built-in furniture?
You can skip areas that will sit under wardrobes or kitchen units. Enter that area in ‘Area to leave out’. Many homeowners still tile fully, so ask your designer.
Why do boxes matter?
Tiles are sold in boxes, and shade and size can differ between batches. Ordering whole boxes from one batch gives a consistent floor.
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