Tile Calculator
Enter your rooms, or the total area, and your tile and joint sizes. The tile calculator divides the floor by the area one tile takes up with its joint, adds your wastage allowance, rounds up to whole tiles and boxes, and prices them if you enter a price. Use it as a flooring calculator for any floor laid in tiles.
Tile calculator
A kitchen island, fitted units or a shower tray. Leave blank to skip.
Bare numbers are mm.
Bare numbers are mm.
Example joint width. Your tile and installer decide; 0 gives the tile face area.
From the box label. Leave blank to skip boxes.
Your price, any currency. Leave blank to skip.
Leave blank to skip the check.
Assumptions
Change any value to match your product or local rules.
Basis: Example allowance for cuts and breakage. Your installer’s figure wins; the Tile Layout Planner counts the cuts for one room.
- Area to tile
- 15.12 m²
- 162.8 sq ft
- Tiles before wastage
- 41.58
- Tiles with wastage
- 46
- Boxes
- 12
- Tiles bought (spare)
- 48 (2 spare)
- Tile area bought
- 17.28 m²
- 186.0 sq ft
- Cost (your currency)
- Add a price to see the cost
- Order check
- Enter the tiles you have to check an order
46 tiles of 600 × 600 mm in 12 boxes for 15.12 m², with a 10% wastage allowance. Quantities are estimates. Buy from one batch and keep a few spare pieces for repairs.
Floor Planner
- “Design this room” opens a room whose inside is 4.20 m × 3.60 m.
How this was calculated
- Area = Σ width × length (or the total area) − area not tiled
- Module = (tile length + joint) × (tile width + joint); tiles before wastage = area ÷ module
- Tiles = tiles before wastage × (1 + wastage), rounded up; boxes = tiles ÷ per box, rounded up
- Order check: allowance = tiles you have ÷ tiles before wastage − 1
- Floor area = 4.20 m × 3.60 m = 15.12 m²
- Module = (600 mm + 3 mm) × (600 mm + 3 mm) = 0.3636 m²
- Tiles before wastage = 15.12 m² ÷ 0.3636 m² = 41.58
- Tiles with wastage = 41.58 × 1.1000 = 45.74, rounded up = 46 tiles
- Boxes = 46 ÷ 4, rounded up = 12 boxes (48 tiles, 2 spare)
How to use it
Measure the floor
Width and length inside the walls for each room, or a total area. Add a row for each part of an L-shaped room.
Take off what you will not tile
A kitchen island, fitted units or a shower tray go in “Area not tiled”. Leave it blank to skip.
Enter the tile and joint
Tile length, width and grout joint. Bare numbers are mm in metric and inches in imperial, so 600 or 1/8 both work.
Read tiles and boxes
Tiles with your wastage allowance, boxes from the tiles per box on the label, and the cost if you add a price.
The formula
Each tile takes up its own size plus one joint each way: module = (tile length + joint) × (tile width + joint). Tiles before wastage = area to tile ÷ module. Tiles = that count × (1 + wastage), rounded up only at the end. Boxes = tiles ÷ tiles per box, rounded up, and the spare tiles are what is left in the last box.
Worked example (prices are illustration only)
A 4.2 × 3.6 m room is 15.12 m². With 600 × 600 mm tiles and a 3 mm joint, the module is 0.603 × 0.603 = 0.3636 m², so the floor takes 41.58 tiles before wastage. With 10% added that is 45.74, rounded up to 46 tiles. At 4 tiles per box you buy 12 boxes: 48 tiles, 2 spare. At 50 per box the tiles cost 600.
In feet: a 14 × 12 ft room is 168 sq ft. With 24 × 24 in tiles and a 1/8 in joint the module is 4.0418 sq ft, so 41.57 tiles, 45.72 with 10% added: 46 tiles in 12 boxes.
Already have 44 tiles? The order check says they cover 16.00 m², a 5.8% allowance, 2 short of the 46 worked out.
What the wastage allowance covers
The allowance pays for cut tiles at the walls, breakage and a few spares for repairs. The 10% here is an example: your installer’s figure wins, and small rooms, many corners or a diagonal layout cut more tiles. Change it in the assumptions and the count updates. Buy every box from one batch so the shade matches.
Assumptions and limits
The count treats the floor as one large grid of whole modules, so it does not place tiles or count each cut; the wastage allowance stands in for the cuts. Rooms are rectangles: split other shapes into rectangles, one row each. A price per area is charged on the face area of the tiles you buy. The calculator holds no prices, tile sizes or box counts of its own; the defaults are examples.
Frequently asked questions
How many tiles do I need for a room?
Divide the floor area by the area of one tile plus its joint, add a wastage allowance and round up. A 4.2 × 3.6 m room with 600 × 600 mm tiles and 3 mm joints takes 46 tiles with 10% added.
How do I calculate tiles per square meter?
Divide 1 m² by the module, the tile plus one joint each way. For 600 × 600 mm tiles with 3 mm joints the module is 0.3636 m², so about 2.75 tiles cover one m² before wastage.
How much extra tile should I buy?
Enough for cuts, breakage and a few spares. The calculator uses 10% as an example allowance; change it to your installer’s figure. The order check tells you the allowance in tiles you already have.
Does the grout joint change the number of tiles?
Yes, a little. Each joint adds to the space a tile takes up, so wider joints mean fewer tiles. Enter 0 for the joint to count by the tile face alone.
How do I count tiles for an L-shaped room?
Split the floor into two rectangles and enter each as its own row. The calculator adds the areas before it counts the tiles.
Ready to plan your space?
It is free, runs in your browser and needs no account. Projects are saved privately on this device.