Tile Calculator
Enter the floor or wall area and your tile size to see how many tiles and boxes to buy, including grout lines and extra for cuts and breakage.
- Grout included
- Waste presets
- Boxes & cost
- Inches or cm
Floor or wall area
Enter feet (12), feet and inches (12' 6" or 12 6) or inches (18in).
130 tiles
Covers 120 sq ft with 10% extra. Exact coverage needs 117.5 tiles.
- Area
- 120 sq ft (11.15 m²)
- Tile footprint incl. grout
- 1.021 sq ft
Buy tiles from the same batch (lot number) and keep a few spares for future repairs.
What is a tile calculator?
A tile calculator works out how many tiles cover a floor, wall or backsplash. It divides the area by the space each tile takes up, including the grout joint, then adds a percentage for tiles that must be cut or might break. Buying the right amount first time matters, because tiles from a later batch can differ in shade.
How to use Tile Calculator
- Enter the area to tile. Add more shapes for L-shaped rooms and subtract cut-outs such as a bathtub or cabinet.
- Enter the tile size and grout joint width.
- Choose the extra for waste: 10% for straight layouts, 15% for diagonal or herringbone patterns.
- Read the tiles needed. Add tiles per box and price per tile for boxes and cost.
How to calculate tiles
- Tile footprint = (tile length + grout) × (tile width + grout). A 12 × 12 in tile with a ⅛ in joint covers 1.02 sq ft.
- Tiles = area ÷ footprint, then add the waste percentage and round up.
- Add 10% for straight layouts, 15% for diagonal and 15–20% for herringbone or rooms with many corners.
- Keep a few spare tiles from the same lot for future repairs.
Why use this tile calculator
- Grout-aware countIncludes the joint width, which matters for small tiles and mosaics.
- Waste presetsPick a margin to suit the layout, from simple rooms to herringbone.
- Several areas at onceAdd rectangles, circles and triangles, set quantities and subtract cut-outs to match real, irregular spaces.
- Feet, inches or metresType 12' 6" or 12 6, switch to metres any time, and see results in both systems.
Common projects
- Bathroom floors. Tile count after subtracting the tub or vanity.
- Kitchen backsplashes. Wall area between counter and cabinets.
- Showers. Each wall as a separate rectangle.
- Patios. Outdoor porcelain pavers in metric sizes.
Planning a bigger project? See all home and DIY calculators, or work out costs with the percentage calculator and discount calculator.
Example: a 12 × 10 ft kitchen floor
A 120 sq ft floor with 12 × 12 inch tiles and ⅛ inch grout needs about 118 tiles for exact coverage. With 10% extra, buy 130 tiles. If a box holds 10 tiles, that is 13 boxes.
What to expect from the result
Real waste depends on the room shape, tile pattern and cutting skill. Large-format tiles and patterned layouts can need more. Wall tiles around windows and outlets need extra cuts.
Tile Calculator questions
How many tiles do I need?
Divide the area by the area of one tile including its grout joint, then add 10% for cuts. For 120 sq ft with 12 × 12 inch tiles, that is about 130 tiles.
How much extra tile should I buy?
Usually 10% for straight layouts and 15% for diagonal or herringbone. Add more for small rooms with many cuts.
Does grout width change the number of tiles?
Slightly. Grout joints add to each tile’s footprint, so you need a few fewer tiles. The effect is larger for small tiles and mosaics.
How many tiles are in a square foot?
One 12 × 12 inch tile, 2.25 tiles of 8 × 8 inches, or 4 tiles of 6 × 6 inches, before grout and waste.
Can I use centimetres?
Yes. Switch to metres and enter the tile size in centimetres and the grout in millimetres.