Tile calculator for floors and walls
This tile calculator works out how many tiles and boxes you need for a floor or wall. Give it the area (or length and width), the tile size and the grout gap, choose the laying pattern — straight, brick bond, diagonal or herringbone — and it returns the tile count with waste, the number of boxes to buy, an approximate grout quantity and the cost in your currency.
It handles the common Indian vitrified sizes (600 × 600, 800 × 800, 1200 × 600 mm), ceramic wall tiles (300 × 600, 300 × 300 mm) and US sizes (12 × 12, 18 × 18, 24 × 24 in, 3 × 6 in subway), or any custom size. The grout joint is included in the footprint of each tile, which is why a 600 mm tile with a 3 mm joint covers slightly more than 0.36 m².
Tilers, home owners and contractors can use it in metres or feet; results update as you type and nothing leaves your browser.
How to use the Tile Calculator
- Choose metric or imperial and enter the length and width of the floor or wall, or switch to “I know the area” and type the m² or ft² directly.
- Pick a tile size from the list or choose “Custom size” for an unusual tile. Enter the grout gap you plan to use (2–3 mm for rectified tiles, 3–5 mm for ceramic).
- Select the laying pattern. It sets a typical waste percentage, which you can override in the waste field.
- Enter tiles per box from the carton and the price per m², per box or per tile. For the grout estimate, enter the tile thickness.
- Read the tiles, boxes, grout and cost, and check the step table. Copy or share the summary to take to the showroom.
Tile Calculator features
Grout gap built into the count
Each tile’s footprint is (length + gap) × (width + gap), so wide joints reduce the tiles needed as they should.
Pattern-based waste
Straight and brick bond default to 10%, diagonal to 15% and herringbone to 20% — or type your own figure.
Whole boxes
Tiles are converted to the number of cartons using the tiles-per-box figure and the tiles you actually receive.
Three ways to price
Enter the price per m²/ft² (how showrooms quote), per box or per tile and get the total for the boxes you buy.
Grout estimate
An approximate grout weight from the joint width, tile thickness and area, including the usual 10% allowance.
Metric and imperial
mm and metres or inches and feet; the inputs convert when you switch.
How the tile count is calculated
The grout figure uses the joint volume per tile (two joint faces × gap × tile thickness) scaled to the whole area, multiplied by a dry density of about 1.6 kg per litre plus 10% — close enough to pick the right bag size.
- Area = length × width, e.g. 4 m × 3 m = 12 m².
- Tile footprint = (tile length + gap) × (tile width + gap). A 600 × 600 mm tile with a 3 mm joint occupies 0.603 × 0.603 = 0.3636 m².
- Tiles needed = area ÷ footprint = 12 ÷ 0.3636 = 33.0 tiles.
- With waste = tiles × (1 + waste %), rounded up. At 10% that is 36.3 → 37 tiles.
- Boxes = tiles ÷ tiles per box, rounded up: 37 ÷ 4 = 9.25 → 10 boxes (40 tiles).
- Cost = boxes × price per box, or the tiled area of the boxes bought × price per m².
Tiles per square metre and per square foot
| Tile size | Tiles per m² (3 mm joint) | Tiles per 100 ft² |
|---|---|---|
| 300 × 300 mm (1 × 1 ft) | 10.9 | 101 |
| 300 × 600 mm | 5.4 | 51 |
| 600 × 600 mm (2 × 2 ft) | 2.75 | 26 |
| 800 × 800 mm | 1.55 | 15 |
| 1200 × 600 mm (4 × 2 ft) | 1.37 | 13 |
| 12 × 12 in | 10.6 | 98 |
| 18 × 18 in | 4.7 | 44 |
| 24 × 24 in | 2.7 | 25 |
Waste, cuts and ordering tips
- Small rooms, many corners and large tiles all raise the waste: a 1200 × 600 tile in a 1.5 m wide bathroom loses a lot of material at every cut.
- Diagonal and herringbone layouts cut every edge tile at 45°, so the offcut from one side rarely fits the other — hence 15–20%.
- Skirting (tile skirting is common in India) needs extra: perimeter ÷ tile length gives the tiles to cut into 100 mm strips.
- Keep a few spare tiles from the same batch for future repairs; shades differ between production lots.
- Need the slab under the tiles? See the concrete calculator. For wooden or vinyl floors use the flooring calculator, and for painting the remaining walls the paint calculator.
Tile Calculator FAQ
How many 600 × 600 tiles do I need for 100 sq ft?
100 ft² is 9.29 m². With a 3 mm joint each tile covers 0.3636 m², so you need 25.6 tiles — 29 after 10% waste, which is 8 boxes of 4. The tile calculator does this for any size.
How many 2 × 2 ft tiles are in a box?
Most 600 × 600 mm vitrified tiles come 4 to a box (1.44 m²); 800 × 800 mm tiles come 2 or 3 per box, 300 × 600 mm wall tiles 5 or 6. Check the carton and enter the number in “Tiles per box”.
How much waste should I add for tiles?
10% for a straight or brick-bond layout in a simple room, 15% for diagonal layouts and 20% for herringbone or rooms with many alcoves. Add more for very large tiles in narrow spaces.
Does the grout gap change the number of tiles?
Slightly. A wider joint means each tile covers a little more floor, so fewer tiles are needed. With 5 mm joints on 300 × 300 tiles the difference is about 3%.
How do I calculate wall tiles for a bathroom?
Add up each wall’s width, multiply by the tiled height, subtract the door and window if they are large, and enter the result using “I know the area”. Run the calculator separately for floor and wall tiles since the sizes usually differ.
Is the cost estimate complete?
It covers the tiles only. Adhesive, grout, spacers, levelling clips, labour and GST or sales tax are extra, so treat the figure as the material budget for tiles.