Tile calculator: square metres and number of tiles

How the calculation works

(surface area − openings) × (1 + your allowance) ÷ area of one tile, rounded up to whole tiles.

Example: one wall 3.0 m wide and 2.4 m high, with a door in it, tiled in 600 × 300 mm tiles.

1. Wall: 3.0 m × 2.4 m7.2 m²
2. Door: 0.9 m × 2.1 m1.89 m²
3. Net tiled area: 7.2 − 1.895.31 m²
4. With a 10% example allowance: 5.31 × 1.105.841 m²
5. One 600 × 300 mm tile: 0.6 m × 0.3 m0.18 m²
6. Tiles: 5.841 ÷ 0.18 = 32.45, rounded up33 tiles

The 10% is an example input, not a recommendation. Enter the same figures above to check the result.

Measuring walls, floors and splashbacks

Measure the area that will actually be tiled, not the whole room. Split an L-shaped floor or a stepped wall into rectangles and add each one as its own surface, then subtract the doors, windows and other areas you will leave untiled. On walls, measure up to the height you plan to tile, which may stop short of the ceiling.

How to measure a tiling project covers irregular spaces and openings step by step. How many tiles do I need? Three rooms worked through runs the same sum for a bathroom floor, bathroom walls and a kitchen splashback. For kitchens, Kitchen wall tiles: how high to tile and how many compares the area at four different heights on one wall.

From tiles to boxes

Full-size tiles are usually sold by the box. Choose a Tilekind tile under "Boxes and delivery" and the calculator rounds the area including your allowance up to whole boxes for you. For any other tile, divide the number of tiles by the pieces in one box, or divide the area including your allowance by the coverage of one box, and round up to whole boxes. For example, if a box holds 8 tiles, 33 tiles is 33 ÷ 8 = 4.125, so 5 boxes.

Where a Tilekind product page lists pieces or square metres per box, that figure comes from supplier documentation; confirm it before ordering. Mosaics are sold by the sheet, so count sheets instead. For every size here, see how many tiles are in a box and per square metre.

Tile calculator FAQs

How do I work out how many tiles I need?

Measure each surface in metres, multiply length by width, subtract anything you will leave untiled, add the allowance you and your installer settle on, then divide by the area of one tile and round up. The calculator above does each step and shows the working.

How many tiles are in a square metre?

Divide 1 by the area of one tile in square metres. A 600 × 600 mm tile covers 0.36 m², so about 2.78 tiles make a square metre; 300 × 600 mm is about 5.56; 300 × 300 mm about 11.1; 75 × 300 mm about 44.4. These use the stated tile size, before any allowance.

How much extra should I allow for cuts and breakage?

The calculator does not set a figure. The layout, the number of cuts, the tile and the installer all change it, so the 10%, 15% and 20% buttons are planning inputs, not recommendations. Agree the allowance with your installer before ordering.

Does the calculator allow for grout joints?

No. It uses the piece size you enter. Check whether the size on the product is the tile itself or includes the joint, and enter the figure you want to plan with.

Can I use it for mosaic sheets or tiles from another shop?

Yes. For mosaics, enter the size of one full sheet, not the small chips. Any rectangular tile works; for irregular or interlocking shapes, check the coverage stated for the product.

Does it tell me how many boxes to buy?

Yes, for Tilekind tiles. Choose the tile under "Boxes and delivery" and it rounds the area including your allowance up to whole boxes (whole sheets for mosaics), with the total weight and the delivery charge for each region. For tiles from elsewhere, divide the area including your allowance by the coverage per box and round up.