Tile calculator — how many tiles, how many boxes, what it costs
Add your rooms, bathrooms, kitchen and balcony, tap the measurements onto the picture, and get one total. Free, no login.
Your project
How to measure
- Measure the length and width of the floor with a tape (feet and inches).
- Measure how high up the wall the tiles go — usually 7 ft in a bathroom, 8–10 ft in a kitchen.
- Enter the door width and window sizes — tiles there are left out.
- Measure each side of the kitchen counter separately; an L-shape has two sides.
Worked examples
A 12′ × 10′ room, 7′ walls, 2.5′ door: (12 + 10) × 2 = 44′ × 7 − 2.5 × 7 = 290.5 → 300 sft of wall; floor 12 × 10 + 3 = 123 sft.
A 9′ kitchen counter, 20″ deep, 24″ tiles: 9 ÷ 2 = 4.5 → 5 pieces (half pieces are not sold).
A 12×24 tile is always laid flat on a wall — a row is 12″ high, so a 7 ft wall has 7 rows.
A 10′ × 4′ balcony: the back wall 8′ high, the other three 3–4′ — each wall is worked out at its own height.
Common tile sizes
| Size | sft per piece | Used on |
|---|---|---|
| 8x12″ | 0.667 | Wall |
| 12x12″ | 1 | Floor |
| 10x16″ | 1.111 | Wall |
| 12x18″ | 1.5 | Wall |
| 12x20″ | 1.667 | Wall |
| 16x16″ | 1.778 | Floor |
| 12x24″ | 2 | Wall |
| 24x24″ | 4 | Floor |
| 32x32″ | 7.111 | Floor |
| 24x48″ | 8 | Floor |
Questions and answers
How do I work out how many tiles my room needs?
Floor = length × width plus 3 sft for cutting. Walls = the distance round the room × the tile height, minus doors and windows, rounded up to 10 sft. This calculator does it for you.
How many pieces and sft are in a box of tiles?
It depends on the size and the brand — 12×18 is usually 10 pieces (15 sft), 24×24 usually 4 pieces (16 sft). The calculator counts boxes for the size you choose.
How many light, deco and deep tiles does a bathroom need?
Enter how many deep rows from the floor and how many deco rows — the rest of the wall is light. Tiles are laid flat, so a row is the short side of the tile.
How many tiles does a kitchen counter need?
Each side's length ÷ the long side of the tile, rounded up to whole pieces. A 20″ counter takes one row of 24″ tiles. On an L-shape the corner is counted once.
How much putty and vixol do I need?
1 kg of putty per 100 sft of wall, 1 kg per 150 sft of large floor tiles; one vixol per 200 sft. The result shows it for you.
Are the prices exact?
They are market averages and vary by shop, brand and area; transport is not included. For the real price leave your number in the form below and a shop near you will call.
How much does tiling cost?
Cost = tiles + grout and vixol + the fitter's labour. Enter your room, bathroom or kitchen above and it shows how many boxes you need and a total estimate from market prices for tiles and materials plus labour at the rate per sft you set.