Floor tile calculator
Tiles are bought with a margin for cuts at the edges and a few spares for later repairs. Order too few and you risk a different shade from a new batch; order too many and you pay for boxes you will never open.
Enter the room's dimensions, the tile format and the waste allowance. If you know how many square metres are in a box, the calculator also tells you how many boxes to buy.
Your measurements
Result
- Net area
- 12.00 m²
- Area to order (incl. waste)
- 13.20 m²
- Number of tiles
- 37 pcs
Buy the whole quantity from the same batch (shade and calibre) — a later order can differ in colour.
How the calculation works
- Net area = length × width, minus areas that won't be tiled (fitted units, bathtub, shower tray).
- Area to order = net area + cutting waste: 10% for a simple rectangular room, 15% for rooms with many corners or a diagonal layout.
- Number of tiles = area to order ÷ area of one tile (for example 0.6 × 0.6 m = 0.36 m²), rounded up.
- Boxes = area to order ÷ coverage per box (printed on the box), rounded up.
Worked example
A 4 × 3 m room has 12 m² of floor. With 10% waste you order 13.2 m². With 60 × 60 cm tiles (0.36 m² each) that is 13.2 ÷ 0.36 = 36.7, so 37 tiles.
What the calculator assumes
- 10% waste covers edge cuts and a few spare tiles. Take 15% for diagonal layouts and for large formats such as 80 × 80 or 60 × 120 cm.
- Grout joints are not subtracted from the area — at 2–3 mm the difference is negligible.
- Tiles are usually sold by the box: always round up to whole boxes.
When to adjust the result
- Skirting tiles are not included: measure the room's perimeter minus the door openings, in running metres.
- Buy the whole quantity from the same batch — shade and calibre are printed on the box.
- The calculation covers tiles only; adhesive and grout have their own calculators.
Frequently asked questions
How much extra tile should I buy?
10% on top of the net area for a straightforward rectangular room laid straight, 15% for diagonal or herringbone layouts, rooms with many corners and large-format tiles. Keep a few spare tiles from the same batch for future repairs.
How many 60 × 60 tiles are in a square metre?
One 60 × 60 cm tile covers 0.36 m², so 1 m² needs 2.78 tiles. Because tiles are bought whole and with waste, always calculate on the whole room, not per square metre.
Do I deduct the area under the kitchen units?
Only for fitted units that will never be moved. Many tilers tile under kitchen units anyway, so the floor stays continuous if the kitchen is replaced later.